TETRA Equipment and Terminals for PMR Networks

Public Safety, Utility and Transport organisations over many years have deployed Private Mobile Radio (PMR) infrastructure equipment with high availability and reliability to provide to provide dedicated, secure communications networks.

Modern implementations of PMR utilise the digital TETRA standard, which provides interoperability between systems and terminals from a range of manufacturers.

@YellowsBestLtd our mission is  “Keeping Customers Operational, by continuing to provided spares solutions, hardware repairs and support services to ensure continued long-term operations and maintenance.  

Examples of the products we have recently been requested to provide spares solutions and repairs services include Motorola Desk Radio Terminals: 

Terminal Products
Part NumberProduct CodeDescription
M47PCC6T25_NMT912MTM700 380-430 MHz DESK Terminal
M80PCC6TZ5_NMT912MMTM800 380-430 MHz DESK Terminal
FIRMWARECLEAR / TEA1 / TEA2Choice for all radios
OPTIONEXP DASHExpand Control Head, 5m cable

If you have similar or other Radio solutions requirements and legacy maintenance services needs, please get in touch to discuss how we may be of assistance.

Cable products

Cable solutions to fulfil bespoke requirements

Customers with deployed infrastructure networks require not only spares, repairs and support, but also cable products to ensure continued long-term operations and maintenance.  

@YellowsBestLtd is pleased to continue to provide bespoke solutions to meet exact requirements. These items are newly manufactured, specifically made to order.

Examples include cables for Nokia ‘Dynanet’ VF E&M interfaces and Bus Wire:

Cable Products
Part NumberProduct CodeDescription
006-22021236.10 Cable21236.10 3mtr 20pr foil/braid LSZH Cable P1 & P2

 

Part NumberProduct CodeDescription
580-512Bus Wire30AWG Solid core unshielded silver cable 8 pair – 50m

“Keeping Customers Operational”

If you have similar or other new cabling requirements, requirements for legacy infrastructure spares, repairs and maintenance support, please get in touch to discuss how we may be of assistance.

Professional CCTV Cameras

Many business operations depend on the security delivered by professional standard CCTV cameras, offering reliability, availability and a wide range of advanced features for mission-critical surveillance applications. One manufacturer that provides an extensive range of such products is Bosch; one of their latest models we feature here.

Bosch MIC IP Starlight 7100i Outdoor PTZ

This example of a robust PTZ IP camera is suitable for deployment in extreme outdoor locations that require reliable 24-hour security monitoring. It features a range of advanced imaging technologies as well as Bosch’s Intelligent Video Analytics.

Featuring a 1/2″ 2MP CMOS sensor and a 6.6-198mm motorized zoom lens, the camera captures video at resolutions up to 1920 x 1080 at 60 fps in a 58.3 to 2.1° field of view. The camera delivers color video in lighting conditions as low as 0.0047 lux and uses an automatic IR cut filter to switch from color to B&W for day/night functionality.

An integrated high-speed pan/tilt system with an anti-backlash drivetrain provides 360° continuous panning and 290° tilting at up to 120° and 90° per second, respectively. Housed in an IP68- and IK10-rated enclosure and equipped with a window defroster, the camera is suitable for use in vandal-prone outdoor locations. Audio input and output ports allow for two-way talk while an SD card slot enables onboard storage of footage. ONVIF compliance ensures compatibility with a wide range of surveillance devices.

Solutions for New and Legacy Product Sources and Supply

@YellowsBestLtd seeks out new products and legacy equipment spares to assist with our aim of “Keeping Customers Operational“. Recent enquiries have included not only CCTV cameras, but also the supplying refurbished and surplus stocks of equipment cards, as well as built-to-order cables and connectors to suit exact requirements. Please get in touch to discuss any solutions or services requirements that you have; we look forward to hearing from you!

Cabling Solutions

Bespoke cable products to suit individual needs

@YellowsBestLtd seeks out new products and legacy equipment spares, ensuring the continued long-term maintenance of infrastructure system.

Equally as important can be the necessary cables to connect data and voice circuits. Often, these are items that can be damaged and disposed of, since repair is difficult or impossible. And original supply is no longer available. Fortunately, we are able to get these bespoke items newly manufactured, specifically made to order.

Here are a few recent examples:

Cable Products
Part NumberProduct CodeDescription
102-722-1Coax-SMB 1mBT3002 Coax Cable BNC Plug to SMB Right Angle, 1m
Coax-SMB-1m
Part NumberProduct CodeDescription
102-722-3Coax-SMB 3mBT3002 Coax Cable BNC Plug to SMB Right Angle, 3m
Coax-SMB-3m
Part NumberProduct CodeDescription
102-722-5Coax-SMB 5mBT3002 Coax Cable BNC Plug to SMB Right Angle, 5m
Coax-SMB-5m

“Keeping Customers Operational”

If you have similar or other new cabling requirements and legacy maintenance needs, please get in touch to discuss how we may be of assistance.

Searching for NMS cables

Call out for any requirements for Network Management Systems cables

In addition to satisfying world-wide customer product sourcing requirements for current and ‘legacy’ equipment technologies, @YellowsBestLtd also seeks out peripheral items such as Network Management System (NMS) cables.

These items may be minor in nature and originally low-cost, but they are vital for continued use and configuration of transmission nodes via management systems which evolved way before modern wireless technologies and smart phone ‘app’ based tools. Such specialist cables are becoming increasingly hard to find, since once used and damaged, they are likely to be disposed of rather than refurbished, and no new replacements are being produced.

However, in the absence of surplus stocks, it is possible for us to arrange for the manufacture of specialist cabling products including those for NMS. Due to the particular nature of the connectors utilised, these have to be specially sourced, but the cable materials themselves can be specified and applied accordingly. However, it is the orginal design information that is most critical to obtain the right functionality and compatibility.

Whatever your requirements, if you are seeking equipment or cabling for new or legacy systems, then please let us know as we can usually assist. We look forward to hearing from you.

The definitive ‘Dynanet’ spares list

Nokia ‘Dynanet’ PDH Transmission products

For many years, the ‘Dynanet’ family of PDH Transmission telecoms products have well served Public Operator and Private Network Customers across the Telecoms, Utilities, Transport and Public Safety markets with high availability mission critical infrastructure, and indeed some networks are continuing to provide good operational service.

They were first introduced by Nokia over 20 years ago, and were continued in recent years by DNWP. Production of the majority of the product range was ceased in 2019. 

Spare parts for continued operational service

@YellowsBestLtd satisfies world-wide customer product sourcing requirements for current and ‘legacy’ equipment technologies from a wide range of Original Equipment Manufacturers (O.E.M.s).

In particular, we are able to supply products from the ‘Dynanet’ range, given that we have a significant amount of refurbished and surplus equipment items in stock for immediate delivery. Hence there continues to be spares support for current and even increased deployed networks.

Comprehensive Stocklist of ‘Dynanet’ Spares

Whereas the ‘Dynanet’ family contained a wide range of products produced and supplied over many years, some of which are relatively obscure and unlikely to be needed, there are a number of core items that have proved to be always in demand by Customers. Consequently, we have endeavoured to create a comprehensive stock list, containing part numbers, product codes and descriptions and images which is presented here, and would welcome any enquiries you have for spares requirements that we can fulfil. If however, you are seeking something more unusual, then please let us know as we can usually assist. We look forward to hearing from you.

Mechanics
Part NumberProduct CodeDescription
T37870.01NDMNDM 19in 17-slot Subrack
Subrack
19in Subrack – T37870.01
Part NumberProduct CodeDescription
T37871.01NDMNDM DN2 19in 17-Slot Subrack
Power
Part NumberProduct CodeDescription
T37882.01NDUNDM DC Unit
NDU – T37882.01
Part NumberProduct CodeDescription
T37882.02NDUeNDM DC Unit
NDUe
NDUe – T37882.02
Part NumberProduct CodeDescription
T37889.01NBUNDM Backup Unit
NBU – T37889.01
Multiplexers
Part NumberProduct CodeDescription
TC 21101DM2DM2 Multiplexing Unit, 75ohm
DM2
DM2 – TC 21101
Part NumberProduct CodeDescription
CC 24002DB2Branching Unit, B2, 2x2Mb/s, 75ohm
B2
DB2 B2 – CC 24002
Part NumberProduct CodeDescription
CC 24011DB2Switching Unit, X2, 2Mb/s, 75ohm
X2
DB2 X2
Part NumberProduct CodeDescription
CU 24111DN2Control Unit, DN2, 75ohm
CC 24101DN2Interface Unit, IU2, 2x2Mb/s, 75ohm
IU2
DN2 IU2 – CC 24101
Optical Line Units
Part NumberProduct CodeDescription
TA 21513DF2-8Terminal Repeater 2-8M, 1300nm, LED MM/SM
TA 21516DF2-8Terminal Repeater 2-8M, 1300nm, LASER SM
TA 21518DF2-8Terminal Repeater 2-8M, 1300nm, LASER LP
DF2-8 – TA21518
Copper Line Units
Part NumberProduct CodeDescription
T65580ACL2iACL2i PF Gen
ACL2i PF GEN – T65580
VF and Sub
Part NumberProduct CodeDescription
CU 21206SUB/SUBChannel Unit SUB/SUB
SUB/SUB – TU 21206
Part NumberProduct CodeDescription
CU 21206.50SUB/SUBChannel Unit RSM (L/E Start) 6ch
SUB/SUB – TU 21206.50
Part NumberProduct CodeDescription
CU 21216SUB/EXCHChannel Unit SUB/EXCH
SUB/EXCH – TU 21216
Part NumberProduct CodeDescription
TU 21236.10VF E&MChannel Unit 8ch E&M/uP: 1xUKe&m/vf
VF E&M
VF E&M – TU 21236.10
Data Interface Units
Part NumberProduct CodeDescription
TU 21125DIU X.21Data IF Unit 48..64k with sync, X.21
DIU X.21 – TU 21125
Part NumberProduct CodeDescription
TU 24013DIU nx64kData IF Unit 2M, nx64k: G.703/704, 75ohm
nx64k
DIU nx64k – CU 24013
Ethernet & ISDN
Part NumberProduct CodeDescription
TU 21133.03ETHERNETEthernet IF 10/100 2ch, 3+3 if, switch
Supervisory
Part NumberProduct CodeDescription
TC 21705SUPY SUBSupervisory Substation
Special Units
Part NumberProduct CodeDescription
T37885.01RING GENRing Generator
T37885.02RING GENRing Generator + DC/DC converter
RING GEN – T37885.02
Optical Teleprotection
Part NumberProduct CodeDescription
D-24204TPSO C37.94Optical Teleprotection Interface, C37.94
C37.94
TPSO C37.94 – D-24204
Q1 Management
Part NumberProduct CodeDescription
T31094.01DCNADCN Adapter C4.0
DCNA
DCNA – T31094.01
Connectors
Part NumberProduct CodeDescription
D-21470EuroEuro Connector 3×7
3x7
Connector 3×7 – D-21470

Connectors – it’s often the little things that count!

When providing a spare parts for a Customer’s project requirements, one of the transmission cards to be used was missing its 5-way pluggable terminal block, without which, it is impossible to wire up and install.

T37882.01 NDU without 5-way connector

Happily we were able to source this from Farnell; this was supplied incredibly speedily – same day dispatch, next day delivery! It’s often the case that little things like this makes big difference in achieving project completion and maintaining operational performance.

T37882.01 NDU with 5-way connector

@YellowsBestLtd our mission is in “Keeping Customers Operational”. We’re always keen to enhance our range of #business services, increase the #enterprise infrastructure we support and expand our mix of #sustainable solutions we offer for supply and maintenance of new and legacy #technologies and products for our customers. 

Please help us understand your management services or solutions requirements, whether you’re implementing new systems or maintaining existing infrastructure networks to serve your operational business needs. 

Solar energy – generation & applications – AC vs DC

‘High Voltage’ – transmission & usage

Following on from our recent post on our Solar Power System – On Grid Project, the observation has been made that it’s rather inefficient to generate power as DC electricity, and convert it to a higher AC voltage, before converting it back again to DC to suit many consumer applications.

Voltage multiple conversion

The issue of use of AC or DC is not a new one. Famously, in 1893, Thomas Edison who promoted the generation and use of DC ‘lost’ the battle to George Westinghouse who gained acceptance for the generation of AC at the Chicago World’s Fair, since it was more efficient in long-distance transmission.

This has been the situation for more than a century and still applies with generation at remote power stations and transmission at high AC voltage to feed and satisfy local demand. The 240V (in the UK) AC mains electricity that is delivered to a household is perfectly suitable in this form for domestic high power applications i.e. cooker, washing machine, etc. On the other hand, electricity is used for variety of low-voltage DC devices and gadgets e.g. phones, TVs, computers and so on, contain power adapters converting AC to DC and stepping down to typically 12v or 5v USB. Lighting is traditionally AC, but with advancement in LED technology could be of a lower DC voltage.

The development of locally generated solar energy changes things somewhat. The generation output is low voltage DC. The majority of this generated electricity is utilised locally. Excess energy can be stored in batteries, which are also low voltage DC. This could be used in this form, but in order for a household to be able to supplement locally generated energy, when the sun doesn’t shine (night time / winter), it still has to be wired to receive AC from the grid-based electricity. Also, to facilitate the export of excess energy (an increasingly valuable benefit of domestic solar power generation), the locally generated electricity must be converted to grid-compatible AC, using an inverter.

It should be the case that houses of the future are designed and built with solar panels on the roof. Indeed, it is now the case they are cheaper that slate, and so the materials and labour charges would be negligible costs if part of the build rather than as an add-on. In which case, the building could be designed with 12V DC and 5V USB supplementary to the 240V AC for mains wiring, feeding appliances directly at the type of voltage they require, eliminating power rectifiers and most voltage converters.

This ‘direct supply’ is already demonstrated in our Solar energy off-grid eBike charger project with the generated supply connected to a AA / AAA / C / D / PP3 battery charger using its 12V DC input (bypassing a 240V AC input, which requires internal conversion). The 12V supply also feeds LED lights without voltage conversion.

Charging batteries from 12V DC Solar Energy

Similarly, the 5V USB outputs of the solar charger controller can charge iPhones and other gadgets.

Solar Charge controller with 5V DC USB sockets

‘Highway to Hell’ – EV charging & V2X

We know that Electric Vehicles (EVs) are going to be increasingly in use and will gradually take over from petrol and diesel engines.

PHEV charging

And so the ability to charge these at home will be increasingly important and convenient. Some cars are already of a Plug-in Hybrid Electric Vehicle (PHEV) type, meaning that they can be charged from a domestic UK 240V AC supply for local use. 

Another key development is the concept of EV batteries being used as supplementary storage for a household, so called ‘Vehicle to Home’ (V2H), ‘Vehicle to Building / Business’ (V2B) or ‘Vehicle to Grid’ (V2G) [collectively V2X indicating bi-directional, as opposed to single direction V1G], charging at low demand and discharging when household usage is greater, or to take advantage of higher export pricing.

V2X Charging types

The AC supply is needed to be converted to a DC voltage useable by the car batteries, and similarly the car’s electricity needs converting from DC to AC for household export. There are two ways of achieving this, by having a converter in the charger or the car. But if the premises has its own source of accessible DC power, ideally sourced from locally generated solar energy, then this conversion would be unnecessary.

AC vs DC charging

Another issue is that UK 240V AC is limited to 13A supply from standard household sockets (for most domestic use) providing slow charging at 3kW. A dedicated charging point using a UK Type 2 connection is an improvement with direct connection to the mains consumer unit, providing charging at 3.6kWh from a 16V AC supply or 7.4 KW from a 32V AC supply. Faster charging is possible with 11kW from 32A AC supply or faster still with 22kW from 63A AC supply, but these are more expensive, beyond the available power of many households and require a 3-phase supply.

The European Union has specified the Combined Charging System (CCS) standard to permit both AC and DC charging. Much faster and more efficient charging at 100kW and beyond is possible using DC charging, eliminating the conversion in the vehicle. However, this is currently an even more expensive solution and limited to EVs that can accept a compatible DC input. Charging at commercial sites such as motorway service stations offer a variety of standards, including the CCS (Europe), CHAdeMO (Japan), GB/T (China) or Tesla Supercharger (propriety).  

EV charging service station offering both CHAdeMO and CCS standards

This conversion and compatibility issue is not confined to motor vehicles. As highlighted in the Solar energy off-grid eBike charger project, conversion using an inverter is necessary from the 12V DC power generated from the Solar Panel and stored in the battery, to 240V AC used by the required charger, which then converts again into 36V DC. The problem is not just related to type and size of voltage, as the lithium batteries used require special adapters to perform the charging correctly. It would be possible to produce these fed from a specialist DC adapter, but such chargers are more difficult (and expensive) to obtain, given that the domestic supplies are generally not available in this form and so consequently the demand for these products is not yet there.

‘Thunderstruck’ – Solar powered cooling (mini project)

Given the current heat-wave and the likely-hood of more temperature extremes as a result of climate change, coupled with cost-of-energy crises and possible supply shortages, it seemed appropriate to build another solar power project, this time focusing on powering a cooling fan with energy from the sun.

The concept is relatively straight-forward: using solar energy to assist with cooling. When sitting out and the sun is shining and the temperature is too hot, the sensible thing to do is shelter under some shade. But when there is little-to-no breeze, even in the shade it gets too hot to bare. In which case, a simple fan can help. The one selected was an old, cheap USB model, which provides a limited amount of cooling, but doesn’t require much energy to operate. Also chosen was a small, also old, and low-cost 6V solar panel, which provides just enough energy to power a USB device using a suitable conversion lead.

Solar powered fan

But this isn’t particularly robust since a slight drop in sunshine can stop the set-up working. Hence this has been additionally paired with a battery power bank, which can simultaneously be charged with the solar energy whilst also powering the fan.

Solar powered fan with battery bank

Naturally, the battery pack can be charged separately – ideally powered by locally generated and stored solar energy!

Charging the battery bank from solar energy

‘For those about to Rock’ – the Electric future

Hopefully this has been food for thought into the exciting fast developing world of solar power generation and the electric future. Please get in touch if you have questions, comments or ideas to share. 

@YellowsBestLtd our mission is in “Keeping Customers Operational”. We’re always keen to enhance our range of #business services, increase the #enterprise infrastructure we support and expand our mix of #sustainable solutions we offer for supply and maintenance of new and legacy #technologies and products for our customers. 

Please help us understand your management services or solutions requirements, whether you’re implementing new systems or maintaining existing infrastructure networks to serve your operational business needs. 

Solar Power System (on-grid) project

‘Free’ electricity from the sun

Obtaining low-cost renewable solar energy has always had much appeal, but historically the investment costs has been rather off-putting, especially in the U.K. where it is perceived that the climate doesn’t provide a reliable enough amount of sunshine.

Available sunlight for power generation

However, in recent years a number of things have changed this evaluation. Performance improvements in solar panels and associated power inverters have resulted gains in energy creation, coupled with the availability of modern battery arrays substantial enough to store the energy produced for later reuse. At the same time, shocks to world fuel prices have results in a rapid shorting of the ‘payback period’; once it was considered that a typical household solar installation would take in the order of 25 years to recoup the investments costs. This has tumbled to around an estimated 8 years based on calculations made last year, and taking into account the recent price increases for domestic electricity supply, the period could be approaching 4 years with further shortening likely as energy prices continue to rise. The recent removal of VAT by the UK government on the implementation of solar energy systems is an added boost.

One additional further benefit that has recently arisen is the introduction by some power utility companies, such as Octopus Energy, of ‘agile’ export tariffs, which pay increased amounts at peak demand times. This can be taken advantage of by the use of smart meters, supplying surplus generated or stored energy to the grid at the best times to maximise revenue, offsetting the purchase of electricity from the grid at other times.

Given that the future is anticipated to require increasing use of electricity to provide power for EV cars and hybrid vehicles, generating your own electricity makes increasing sense. 

Overview of our implemented system

Solar Power System overview

Given the now obvious benefits of a solar energy, we have acted accordingly and implemented a system, which has the following component parts:

  • 13x 385W JA Solar Monocrystalline Panels with PERC technology, limited by the available roof space, but sufficient for energy needs.
  • Alumero Mounting accessories & Tigo Optimisers to enhance performance when part of the solar array is shaded.
  • Luxpower Hybrid Auto Inverter, 16A single phase, to convert the generated 12V DC electricity to 240V AC for household consumption or export.
  • 4.8 kW Aoboet Uhome battery storage array to store excess energy for later use.
  • AC and DC isolators to connect the component system parts.
  • Generation meter to measure energy production.
  • Wifi Monitoring portal for displaying instantaneous and historical performance.

The calculated annual yield for this system is 3,679kWh, which should be enough to fulfil the household’s electricity needs, estimated at 3,207kWh based on previous usage. 

Solar Panels – the ‘heart’

Monocrystalline Solar panels

Key to the collection of energy from the sun are naturally the solar panels. These vary in size, and technology is improving continuously, so the latest available are more efficient than previous generations.

Those selected for this project were 13 x 385W JA Solar Monocrystalline Panels with latest PERC (Passivated Emitter and Rear Cell) technology. Monocrystalline are more expensive but more efficient, with a longer lifespan than other types available. PERC technology improves light capture near the rear surface, optimising electrons flow and thereby achieving higher efficiencies.

Solar Panels installed on the Roof

The amount produced by a solar array naturally depends on sunlight hours and will be much lower with poor weather or as daylight reduces, whilst household electricity demand also varies during the day.

The ultimate aim of using solar power is to reduce as far as practically possible the need to source energy from the grid. Consequently, a larger array of modules than those just to meet the typical usage amount is needed to ensure adequate production whatever the weather, with the excess being stored or exported. 

Mounting fixtures
Optimisers

Alumero mounting kits were used for fixing the solar panels to the property roof, together with Tigo optimisers which maximise the generation from each panel. Without such optimisation, the power output from all solar modules can be reduced when some of the array is in shade. 

DC Isolators

DC isolators connect two ‘strings’ of series connected panels to the Hybrid Inverter.

Hybrid Inverter – ‘the brains’

In order for the system to be truly useful, power conversion and energy management functions are needed, to ensure a seamless and uninterrupted supply of electricity from the available sources i.e. an appropriate mix of the local generation, storage and grid supply. Chosen for this installation was a Lux Hybrid Automated 16 Amp single phase inverter.  

Inverter

The Hybrid Inverter ensures that when solar energy is available i.e. during daylight hours, this is firstly routed to provide for domestic consumption, and then used to charge the battery storage (as required, if not full). Any additional energy is exported to the external grid. When there is not enough energy generation from the solar array, the hybrid inverter routes the energy storage to the household, and when this is depleted, electricity is imported from the grid in the usual way. Critically, where to source electricity from is completely seamless such that the domestic consumption is never interrupted and the household is unaware of these ‘decisions’ being made.

It’s the inverter’s job to take the DC electricity produced by the solar panels and turn it into 240V AC electricity for household use. It’s a sad fact that many domestic appliances then take this 240V AC and convert it back to DC and lower voltages like 12V and 5V; this double conversion adding theoretical inefficiencies. But this is simpler to implement than rewiring the entire building and trying to then integrate with power to and from the grid.

AC Isolator
AC Isolator

AC Isolators connect the Inverter’s output to the household electricity supply.

Batteries – ‘the memory’

Quite literally, ‘saving for a rainy day’ is the function of the batteries, which add to the capability and capacity of solar power generation. They are effectively ‘optional’ since the system can be run without them. But since there is a huge natural variation between maximum sunlight and night-time, it makes sense to capture excess energy at peak times, and use this when sunlight is not available or sufficient. 

Chosen for this project were 2x Aoboet Uhome-LFP 2400 providing 4.8kW of storage capacity.

Batteries

At the beginning of a day, the batteries are naturally somewhat depleted, and therefore excess solar energy is initially used to charge them. Once full, they remain ‘on standby’ until later when generation is unable to fulfil the immediate electricity needs, in which case they start discharging their stored energy. Ideally, they will not become completely depleted over the course of the day and night, so that energy is not needed to be imported from the grid.

Grid – import / export

Electricity from the grid is the “insurance” for times when the solar energy is not able to fulfil demand. Naturally, this is likely to be due to a lack of winter daylight hours and/or poor weather, which of course has to be paid for.

Generation Meter

But at other times, there will be an excess of energy that can be exported to earn back some of these costs. A Generation Meter as part of the solar energy system enables this export of electricity.

Smart Meter
WiFi Monitor

The bi-directional energy flow is measured with a ‘smart’ meter using a suitable import / export tariff from the Utility company, such as the Octopus with their Agile tariff, and displayed on an associated WiFi monitor.

As to be expected, the amount paid by the Utility for kWh export is considerably less than that charged for import, so it’s worth making best use of the generated and stored energy as much as possible, like running appliances when the sun shines!   

EPS socket

An EPS (Emergency Power Supply) socket was additionally included in this project. Though optional, it was chosen for providing ‘backup power’ from the solar energy system in the event of a power outage from the grid supply. It is standard practice in such an event to shut off the export to the grid from solar energy systems to avoid difficulties whilst restoration work is in progress. But during such a period, the household can make use of the generated and stored local energy, for a limited time and restricted to a maximum of 13A. Avoiding excessive consumption, it should be possible to maintain a local supply for 12 hours, assuming a fully charged battery array.

MCS Certificate

To complete the project to become an ‘energy generator’ (as well as satisfying own consumption needs), an MCS (Microgeneration Certificate Scheme) certificate is issued, together with receiving acceptance documentation from the DNO (District Network Operative). This then allows the establishment of the export tariff with the Utility provider so that payments for excess energy exported will be made. 

Operating performance

A WiFi Portal provides the householder with an overview of the current operation of the solar energy system, displaying instantaneous status and historical energy performance for tracking generation yield and import / energy export.

WiFi Portal

Initially, it can be reported that average energy yield is around 0.86kWh, ranging between a typical peak of 2-4kW during the day and zero at night, compared with average consumption of approximately 0.35kWh, with the excess charging the batteries in the morning and exporting to the grid during the rest of the day. During the night, the consumption is met from the battery storage, with the batteries depleted to around 11% by the next day. It is noted that even during relatively cloudy days, at least around 10% of the 5kWh maximum power is generated, enough to at least meet the immediate consumption needs and even provide some battery replenishment.

A complete picture of the operating performance of the solar energy system will be known after a full year, taking into account the peak of summer and the shortest winter daylight period. Rising costs of electricity will also impact on the longer-term cost savings anticipated. 

Conclusions

Hopefully this ‘project description’ is of interest and perhaps of use to anyone contemplating installing a Solar Energy system at their home or office premises. Please feel free to get in touch if you would like us to provide consultancy advice (on a no-obligation FOC basis) leading to a quotation for establishing your own system, or just to gain an in-depth appraisal and more information from our first-hand experience of implementing a Solar Energy system. 

System Schematic

Our summary of conclusions at this stage having now implemented a system are:

  1. Solar energy collection has developed rapidly in recent years, particularly now that home energy storage is practical enough to capture excess energy during peak daylight and release it for use during the night or whenever demand exceeds generation.
  2. Although such systems are still a significant investment, given the recent escalation in energy costs, the ‘break-even’ point has reduced dramactically and the trend is for energy costs to continue to rise thereby making the payback period increasingly shorter.
  3. An attractive feature is the notion of being paid to supply energy to the grid, though it should be noted that currently at best this is 7.5p per kWh, so unlikely to be a significant revenue source. But it does mean that energy bills over the longer term will be vanishingly small.
  4. The contribution to the nation’s renewable energy mix helps in a small way to aid the drive to reduced carbon emissions and tackle climate change. 
  5. Naturally, a suitable oriented roof or land space for solar panel installation is required, as well as a location for housing the inverter and batteries (loft space is ideal). Plus, it should be noted that a PV cable needs to be installed (most likely running down the outside wall of the building) to link the inverter to the consumer unit.
  6. Should power cuts from the grid occur in the future, the solar energy system is capable (thanks to the EPS socket) of providing power for a limited period to maintain household electricity use.
  7. With the increasing use of electric cars (all new will need to be at least hybrid by 2030), being able to source local renewable energy will make increasing sense.

@YellowsBestLtd our mission is in “Keeping Customers Operational”. We’re always keen to enhance our range of #business services, increase the #enterprise infrastructure we support and expand our mix of #sustainable solutions we offer for supply and maintenance of new and legacy #technologies and products for our customers. 

Please help us understand what would be of interest to you by getting in touch to discuss your management services or solutions requirements, whether you’re implementing new systems or maintaining existing infrastructure networks to serve your operational business needs. We look forward to hearing from you.

Spares

Support for new and legacy systems

Our mission is with “Keeping Customers Operational”. One of the ways we accomplish this aim is by supplying spare parts for infrastructure systems, which are typically established, long-standing and therefore proven and fit-for-purpose. It makes sense to maintain and extend the life of these systems, as wholesale replacements will be costly and disruptive. This is particularly applicable when the service requirements have not changed, so functionality upgrades are not necessary.

Sometimes new product spares can be sourced, either manufactured to order, or from surplus stocks. Often when product ranges have been discontinued, the items can still be supplied as refurbished, working and tested elements, having been extracted from decommissioned networks.

Requirements for spare parts vary across a wide range of technologies and are usually sourced to support ‘legacy’ networks, but we also receive requests for new products to supplement the scope and capacity of more recently deployed systems.

@Yellowsbestltd would be keen to hear from you should you have any spares requirements. We have various elements in stock, and anything we don’t have immediately available we can usually source very quickly. Please get in touch to let us know what you need.

By example, there follows a list of a few recent requests we have been able to assist with. We look forward to hearing from you with any feedback you may have.

Recent spares requests

Part NumberDescription
D-21740Euro Connectors 3×7
D-21470 – Euro Connectors 3×7
Part NumberDescription
TU21206Subs/Subs

Part NumberDescription
T37885.02Ring Generator + DC/DC converter
T37885.02 – Ring Generator + DC/DC converter
Part NumberDescription
CC24101DN2 IU2
CC24101 – DN2 IU2
Part NumberDescription
ADR155cA155 BLK STM1/4 21E1 19″/ETSI CORE CHASSIS
Sagem ADR155c