Founded in 2010, Solax launched it's first solar inverters for the UK market in 2015. Most Solax Power solar inverters were provided with a 10 year manufacturer's warranty, so even if the initial installer is no longer trading, if there is found to be a fault with the solar inverter then Solax will cover the cost of a repair/replacement.
Solax Power Inverter (Hybrid) Faults and Repairs
All Solar Inverter Fault Codes, Warnings and Troubleshooting
Solax Power Solar Inverter LED Indicators:
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Some of the advice we give related to identifying, confirming and or resolving some of the faults detailed below, starts with safely shutting down and restarting the solar inverter and the solar PV system. This is something that nearly all solar PV systems installed in the UK would have been designed to be carried out safely by the solar PV system owner. However, paperwork, schematics and manuals are not always clear or available, so if you have any concerns about how to do this, Contact us and we will be pleased to talk you through the process over the telephone at no charge.
Leave everything near the supply meters turned on. At the solar inverter there will be an AC isolator, this is used to isolate the mains/grid supply from the solar inverter and to prevent the solar inverter from feeding solar power into the electrical system. Switch the AC isolator 'off', if the solar inverter is running correctly you will hear a clunk inside the machine and after a while a 'no-grid', 'missing grid' warning or similar on the LCD display.
AC Isolator |
Near to and or built into the solar inverter will be a method of isolating the solar (DC) supply from the solar inverter. Often these are black and grey and will be labelled 'DC isolator' or similar. There might be two or more of these if the system is fed by multiple strings. If there isn't a seperate DC isolation device, there will be a way to isolate the DC supply built-in to the solar inverter itself (often a rotary style switch underneath), turn this 'off'. When all of the lights on the solar inverter have gone out, reintroduce the AC/mains power supply by turning the AC isolator 'on'. Introduce the DC supply by turning all DC isolators 'on'. This will restart the solar inverter, on the display it might show you progress during it's startup procedure. During startup is when the solar inverter carries out all of the tests needed before being able to connect the solar supply to the electrical system. If errors are found during testing they will be displayed on the screen or an indication light might come on. Make a note of any warning messages, warning lights and fault codes. |
If the restart is succesful a green light will come on, sometimes flashing at first but once connected to the mains/AC supply remaining permenantly on. The LCD display will show how much power the solar PV system is generating. The solar PV system can be verified as working at the solar generation / Feed in Tariff (FIT) meter which will count on the display, the red light will pulse as it counts.
Solax Power solar inverters are powered by the solar panels (the DC supply) and will startup at sunrise each day and shutdown at night. If you find the solar inverter with no lights or display working during the day, there is either a problem with the solar panels or with the solar inverter. Follow the shutdown and restart procedure outlined above and if the problem persists Contact us to discuss the next steps.
If you have the correct tools and are comfortable in doing so, isolate the AC and DC power supplies from the solar inverter and confirm that the incoming DC voltages are as expected by measuring between the positive and negative incoming terminals in DC isolators (if avalable) and or at the DC solar inverter inputs. Light conditions and the type of solar panel will affect voltages but as a rule of thumb anywhere from 30V-60V per panel x the number of panels connected in series in the string would be a reasonable voltage estimate.
No or very low DC voltage would suggest a problem with the solar panels, measuring the expected voltage at the isolator terminals and or the DC inputs, although additional testing should be carried out, would suggest a problem with the solar inverter. Contact us to discuss the next steps.
Grid Fault - The solar inverter is measuring grid (mains) conditions such as voltage or frequency that are out of range. See * No Utility below. If this fault persists after a safe shutdown and restart then contact us to arrange for a solar engineer to visit to establish whether the fault lies with the solar inverter or with the grid.
No Utility - The solar inverter is not measuring a grid (mains) voltage suggesting that mains power to the unit has been disconnected. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'.
Check fuses, isolators, Miniture Circuit Breakers (MCBs) and Residual Current Devices (RCDs) in and around consumer units, around the solar generation and mains/grid supply meters and see if anything marked 'solar PV' or you can see is related to the solar PV system is switched 'off'. The solar generation meter draws it's power from the mains so if this isn't on, this would be a strong indication that something heading toward the incoming grid/mains power supply has tripped off.
RCD
MCB |
An RCD has a test button and is twice the width or a circuit breaker. An RCD that's switched itself 'off' is an indication that it has picked up an earth fault somewhere on the circuit that it protects, this fault could be anywhere on the circuit and might have been temporary. - If an RCD has switched itself 'off' it's ok to try to turn it back 'on' again. If you meet with instant and strong resistance to closing the switch, leave it 'off'. If it stays on for a short while and switches off when the solar PV system has warmed up and begun to feed in power, there's most likely a problem with the solar PV system somewhere, leave the RCD turned 'off' and contact us to discuss the next steps. If the RCD remains on for a few hours, weeks or days and then switches itself off, faults like these are often weather related. Damp cables and wet or windy conditions will often expose faults both physical and in design, with AC and DC cabling, connectors, solar panels and RCDs. Contact us to discuss the next steps. If the RCD stays on, the solar inverter starts up and everything works fine in all conditions - all good. - If a circuit breaker has switched 'off' this is an indication of either a short circuit, most likely a serious failure either within the solar inverter or with the solar inverter supply cable. Or for some other reason the circuit breaker has picked up a fault and isolated the circuit to prevent the solar inverter supply cable from becoming overloaded. Turn on circuit breakers at your own risk, there is the potential to cause damage and only do so when you are able to access and inspect the solar inverter and all isolation equipment whilst it's in operation. If you meet instant and strong resistance, leave the circuit breaker 'off' and turn everything to do with the solar PV system 'off' remembering to also safely isolate the DC circuits. If the circuit breakers stays on and then switches itself off after a few minutes, this is reasonably strong indication that the solar inverter has a serious internal fault. Turn off everything to do with the solar PV system including the DC isolators and contact us to discuss the next steps. |
If the circuit breaker stays on, the solar PV inverter starts up and feeds power into the electrical system through the circuit breaker; although the circuit breaker will continue to protect the circuit, ideally a physical inspection and electrical test of the supply circuit including all isolators, circuit breakers, RCDs and electrical connections would also be carried out.
- Everything's 'on' but the error remains and the solar inverter won't start. If everything on the grid/mains power supply side including the solar generation meter is switched 'on', this would be an indication that there is either an internal fault within the solar inverter or there's a problem with the grid/mains power supply. Contact us to discuss the next steps.
PV Over Voltage - The solar inverter is measuring too much voltage from the solar panels. Assuming that this is an existing installation that has been specified correctly, hasn't recently been changed or added to and has operated before without problems. This could mean either a problem with the solar panels or with the solar inverter. We would advise that the DC side of the system is disconnected using either the built in DC isolator at the bottom of the solar inverter or the DC Isolator installed between the solar panels and the solar inverter (if available) and contact us to test the DC side of the system including and excluding the solar inverter.
DC INJ High - DC injection into the AC supply is higher than the set value. This is likely an internal component fault within the solar inverter. Also see * Ground I Fault below.If after the system has been safely shutdown and restarted this condition persists then contact us.
SCI Fault - If after the system has been safely shutdown and restarted this condition persists the inverter has a fatal error and should be replaced. There are a few ways that we can help with this: Solar Inverter Replacement
AC Sensor Fault - If after the system has been safely shutdown and restarted this condition persists the inverter has a fatal error and should be replaced. There are a few ways that we can help with this: Solar Inverter Replacement
Consistent Fault - If after the system has been safely shutdown and restarted this condition persists the inverter has a fatal error and should be replaced. There are a few ways that we can help with this: Solar Inverter Replacement
Relay Fault - If after the system has been safely shutdown and restarted this condition persists the inverter has a fatal error and should be replaced. There are a few ways that we can help with this: Solar Inverter Replacement
Ground I Fault - This error is generated when during normal operation of the solar inverter, a leakage current to ground/earth is detected on the DC side of the system. Although it is also possible that the solar inverter generates this alarm message due to AC leakage currents connected to the capacitive nature of the solar panels compared to ground/earth or there could be a problem with the solar inverter itself.
For as long as the situation persits then the solar inverter will not startup. Earth / Ground Faults (also called Insulation or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the solar PV system through damaged solar panels, connectors or cabling. These faults often clear when weather conditions improve but they will not get better by themselves, most often degrading and becoming more dangerous over time. We would advise that you book a solar repair engineer's visit in order to carry out a full solar system test, identify the source and rectify the fault. We've written more about how to identify and repair ground faults here: Ground Faults, Isolation (ISO) Faults, RISO Low Faults and Insulation Resistance Faults with Solar PV Systems |
EEPROM Fault - If after the system has been safely shutdown and restarted this condition persists the inverter has a fatal error and should be replaced. There are a few ways that we can help with this: Solar Inverter Replacement
GFCI Fault - This error is generated either due to a leakage current to ground/earth on the DC side of the system or an internal fault within the solar inverter. See * Ground I Fault above. If after the system has been safely shutdown and restarted this condition persists then contact us.
Solax Power inverters contain valuable materials such as copper and aluminium, these materials are in high demand and recycling them is significantly less energy intensive than extracting them from ore.
If you find yourself with a damaged or faulty Solax Power inverter, we will be pleased to help you recycle it.
Regular solar PV system testing, servicing and maintenance will extend the life of your solar PV system and ensure that solar panels are always operating safely and at their best, whilst maximising yields.
If you have a faulty solar inverter, we offer an efficient, value for money, hassle free solar inverter replacement service. We offer good advice and install quality equipment with comprehensive warranty and support options. We will test the rest of the system as part of the service, take care of all hardware deliveries, record your new unit's serial number and confirm the warranty details with the manufacturer.
Lots of articles, calculators and technical information including links for further reading. Covering a range of topics related to the installation and maintenance of solar photovoltaic and electrical systems in the UK.
Solax Hybrid Inverter Faults and RepairsMost Solax Power hybrid inverters were provided with a 10 year manufacturer's warranty, so even if the initial installer is no longer trading, if there is found to be a fault with the solar inverter then Solax will cover the cost of a repair/replacement. Popular early UK models of Solax hybrid invertes include the SK-SU3000, SK-SU-3700 and the SK-SU5000. BSI - PAS 63100:2024 - Protection Against Fire of Battery Energy Storage Systems for use in DwellingsThis Publically Available Specification (PAS) from the British Standards Institution (BSI) was sponsored by The Department for Energy Security and Net Zero. Although not yet a British Standard, this guidance was developed in response to an urgent demand for clarity as to good practice across the industry including product, service and process standards. How to provide backup power to a house using a portable generatorIn this article we show you how to provide backup power to your home using a portable diesel, petrol or LPG backup generator. We look at changeover switches, the importance of earthing, backup generator loadings, how to isolate non essential loads. We ask where to locate the backup generator when it's in operation, how best to safely isolate the grid/mains power supply and switch to a backup generator supply. Ground Faults, Isolation (ISO) Faults, RISO Low Faults and Insulation Resistance Faults with Solar PV SystemsAfter a number of years exposed to wind, rain, snow, ice and sometimes animals; solar panel systems can start to develop faults. The most common faults we find related to exposure are ground faults, isolation (ISO) faults, RISO low faults and insulation resistance faults. In this article we take a look at what these faults are, the possible causes and what steps are taken to identify and resolve them. |
"Our inverter failed and as our installer had gone out of business did not know what to do. Contacted Glen who was brilliant. Came out checked the failure dealt with the manufacturer and all aspects of the warranty claim.New inverter received under warranty and Glen came out and fitted the new one straightaway. Superb service from a very professional and helpful person. Highly recommend this company." Martin Brailey, Wokingham
We've carried out Solar PV System design, installation, testing, repair and maintenance work on solar PV systems of all shapes and sizes all across the UK.
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