Solax Power Hybrid Inverter Faults and Repairs
Founded in 2010, Solax launched it's first solar inverters for the UK market in 2015. Most 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.
Solax Power Inverter (Grid-Tied) Faults and Repairs
All Solar Inverter Fault Codes, Warnings and Troubleshooting
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Solax Power Hybrid Inverter LED Indicators:
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Solax Power Hybrid Inverter Faults and Warnings:
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.
* SPI Fault - SPI communication 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
* SCI Fault - SCI communication 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
* CAN1 Fault - CAN communication fault - This is a communications error between the solar inverter and the batteries. Shutdown the system, disconnect and reconnect the communications cable and restart. If this condition persists then contact us.
* PVConfig Fault - PV Connection Setting 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
* Inv EEPROM Fault - Inverter 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
* 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
* Sample Fault - Detection circuit 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
* RCD 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
* Fan1 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
* Fan2 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 HCT Fault - AC current 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
* OverLoad Fault - Overload in Emergency Power Supply (EPS) mode - The power attempting to be drawn from the batteries when in EPS mode (i.e. when no grid connection is present) is greater than the solar inverter can handle. In the first instance switch off the device that is drawing the power and press 'ESC' on the solar inverter to reset. If this fault persists after a safe shutdown and restart or if EPS mode isn't enabled then contact us.
* EPS OCP Fault - Over Current in Emergency Power Supply (EPS) mode - The current (amps) attempting to be drawn from the batteries when in EPS mode (i.e. when no grid connection is present) is greater than the solar inverter can handle. In the first instance switch off the device that is drawing the power and press 'ESC' on the solar inverter to reset. If this fault persists after a safe shutdown and restart or if EPS mode isn't enabled then contact us.
* DCI Device 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
* EPS 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
* TZ Protect Fault - Over current Fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* Grid Lost Fault - 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
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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.
* Grid Volt Fault - Grid Voltage out of range - The solar inverter is measuring a grid (mains) voltage that is either too high or too low in relation to the parameters that the solar inverter has been set to safely operate within. See * Grid Lost Fault above. If this fault persists contact us to arrange for a solar engineer to visit to establish whether the fault lies with the solar inverter, the solar inverter supply circuit or with the grid.
* Grid Freq Fault - Grid frequency out of range - The solar inverter is measuring a grid (mains) frequency that is either too high or too low in relation to the parameters that the solar inverter has been set to safely operate within. See * Grid Lost Fault above. If this fault persists contact us to arrange for a solar engineer to visit to establish whether the fault lies with the solar inverter, the inverter supply circuit or with the grid.
* PLL Lost Fault - The inverter is measuring unusual grid (mains) conditions. If this fault persists contact us to arrange for a solar engineer to visit to establish whether the fault lies with the solar inverter, the inverter supply circuit or with the grid.
* Bus Volt Fault - Bus voltage out of normal range - 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 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 panels and the solar inverter (if available) and contact us to test the DC side of the system including and excluding the solar inverter.
* AC5M Volt Fault - Grid Voltage out of range for the last 5 minutes - The solar inverter has measured a grid (mains) voltage that is either too high or too low in relation to the parameters that the solar inverter has been set to safely operate within. 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'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for a solar engineer to visit to establish whether the fault lies with the solar inverter, the supply circuit or with the grid.
* AC10M Volt Fault - Grid Voltage out of range for the last 10 minutes - The solar inverter has measured a grid (mains) voltage that is either too high or too low in relation to the parameters that the solar inverter has been set to safely operate within. 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'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for a solar engineer to visit to establish whether the fault lies with the solar inverter, the supply circuit or with the grid.
* Inv OCP Fault - Inverter over current protection fault - The solar inverter is measuring current above an acceptable limit. This fault may clear itself but if it persists and after the system has been safely shutdown and restarted then contact us.
* PV Volt Fault - There is an issue with the voltage from the panel side of the system. This could mean either a problem with the 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 panels and the solar inverter (if available) and contact us to test the DC side of the system including and excluding the solar inverter.
* Isolation 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.
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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 |
* Temp Over Fault - The solar inverter is too hot. This could be due to a number of factors, for example 1) If the solar inverter is exposed to direct sunlight 2) If the solar inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate 3) The solar inverter's components are getting too hot due to an internal component fault. If the unit isn't running hot and if after the system has been safely shutdown and restarted this condition persists then contact us.
* Fan1 Speed Fault - Fan speed outside of the normal range - 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
* Fan2 Speed Fault - Fan speed outside of the normal range - 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
* C1 CAN Fault - This is a communications error between the solar inverter and the batteries. Shutdown the system, disconnect and reconnect the communications cable and restart. If this condition persists then contact us.
* C1 Temp High - The integrated battery charger is too hot. This could be due to a number of factors, for example 1) If the solar inverter is exposed to direct sunlight 2) If the solar inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate 3) The solar inverter's components are getting too hot due to an internal component fault. If the unit isn't running hot and if after the system has been safely shutdown and restarted this condition persists then contact us.
* C1 Fan 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
* C1 TZ Fault - Over current Fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* C1 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
* C1 HCT1 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
* C1 HCT2 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
* C1 Bus OVP - Over voltage Fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* C1 Temp Low - The temperature of the integrated battery charger is too low, this is most likely due to low environmental temperatures. If the operating temperature is within range and after a safe shutdown and restart the condition persists then contact us
* C1 Boost OVP - Over voltage fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* C1 Bat OVP - Battery over voltage fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* C1 Charger OCP - Over current fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* C1 Bus OVP - Over voltage fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* C1 Boost OCP - Over current fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
* CT Fault - This is a communications error between the solar inverter and the mains with the CT clamp. Shutdown the system, disconnect and reconnect the CT clamp and restart. If this condition persists then contact us.
* RC Fault - DCI over current protection fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
DCI OCP Fault - DCI over current protection fault - This could be a temporary condition which will clear itself when normal conditions return. If the condition doesn't clear then this is likely an internal error within the solar inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
Other device 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
SW OCP Fault - An Over current fault has been detected by software - 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
DM9000 Fault - Network DSP 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
RTC 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
Mgr EEPROM Fault - Manager 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
Mgr CAN Fault - Manager CAN 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
C1 SPI 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
C1 Sample 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
Solar Inverter Recycling: - Recycling Solax Hybrid Inverters
Solax Hybrid 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 Hybrid inverter, we will be pleased to help you recycle it.
- There is no charge for this service but all costs involved with decommissioning and transportation are covered by you.
- If you're delivering an inverter to us in person, although it's usually no trouble to arrange other days, the most convenient time for us is between 9am and 2pm on a Saturday, please let us know of your visit with an approximate time in advance.
- We do not buy or sell used solar inverters or used inverter parts. For UK buyers and sellers, we've found ebay to be the best place for buying used solar inverters and inverter parts.
- We can accept deliveries by courier at all times throughout the week but please contact us before you arrange this.
- We can also help to recycle solar panels, solar batteries and solar mounting equipment.
Solar Power System Testing, Servicing & Maintenance
Regular solar PV system testing, servicing and maintenance will extend the life of a solar PV system and ensure that solar panels are always operating safely and at their best, whilst maximising yields.
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We offer complete safety and performance testing for solar PV power systems of any size. Includes solar panels, cables, solar inverters, isolators and mains connections.
We provide solar power system testing and maintenance services for residential, commercial, industrial and agricultural clients across Southern, South West England and the West Midlands, with specialist experience working with farmers, developers and commercial and industrial buildings owners. |
Solar PV Inverter Replacement
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 the new unit's serial number and confirm the warranty details with the manufacturer.
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Our solar electricians work cleanly and will dispose of any unwanted boxes, faulty equipment and packaging.
Many modern solar inverters can now use wireless home networks to transmit solar generation data to PCs, tablets and smartphones, so if you would like something like this, let us know and we will be happy to set it up as part of the installation. |
Solar PV Systems & Equipment, including Electrical & Roofing Systems
Grid-tie inverters, Hybrid Inverters, AC Coupled Inverters, Battery Storage Inverters, Off-Grid Inverters, Charge Controllers, Transfer Switches, Hot Water Controllers, Optimisers, Lithium Batteries, Lead Acid Batteries, Solar Panels, Mounting Systems, Test Equipment, Earthing Equipment, Electrical Distribution Equipment, Cable and Accessories
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Deliveries to anywhere in the UK are quick, tracked and accurate, technical support (by phone and on site if needed) and design/product advice is available before, during and after installation. The recording and collating of serial numbers, factory and other test results, manuals any other information required for equipment warranties, add ons and extensions is included. Trade, DIY and Retail Clients Welcome. |
Bespoke system design, equipment testing and integration support as well as on-site technical support and job/equipment specific training is available for off-grid, hybrid, larger and or more complex systems.
Mains/Grid Isolation and Surge Protection
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A whole house surge protector is installed to provide protection from transient overvoltages originating from the mains/grid. A whole house surge protector is installed directly inline and as close as possible to the incoming mains/grid supply meter, this allows for surge protection for all circuits and equipment including solar inverters, routers, stereos and other sensitive electrical equipment within the network. The addition of a 100Amp lockable isolator also allows for safe and convenient isolation of all electrical equipment within the network including consumer units, solar inverters, battery storage units and EV chargers from the mains/grid in one place. Surge protectors are in compliance with the recently updated 18th edition amendment 2 of BS7671. |
Articles: Further Information, Calculators & Solar Inverter Fault Codes
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.
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Solax Inverter Faults and RepairsFounded in 2010, Solax launched it's first solar inverters for the UK market in 2015. Most Solax Power 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. 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. |
What Our Customers Say:
"Glen replaced our inverter. Excellent honest guy. We wouldn’t deal with anyone else highly recommended." Nicola Moger, Devizes
Case Studies
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.
Areas Served:
We are located in Wanborough, very close to Swindon in Wiltshire, Southern England, UK. From here we service clients within a 90 minute driving radius including the towns, cities and regions below:
Swindon: Abingdon, Aldbourne, Amesbury, Andover, Banbury, Basingstoke, Bath, Berkshire, Bicester, Blunsdon, Box, Bracknell, Bradford on Avon, Bridgwater, Bristol, Buckingham, Burford, Burnham on Sea, Calne, Camberley, Cardiff, Carterton, Cheltenham, Chippenham, Chipping Norton, Chipping Sodbury, Cirencester, Corsham, Cricklade, Devizes, Didcot, Evesham, Eynsham, Faringdon, Frome, Fleet, Glastonbury, Gloucester, Gloucestershire, Hampshire, Henley-on-Thames, Highclere, Highworth, Hook, Hungerford, Keynsham, Kingsclere, Lambourn, Lechlade, Ledbury, Ludgershall, Lyneham, Maidenhead, Malmesbury, Marlborough, Marshfield, Melksham, Minety, Newbury, Newport, Oxford, Oxfordshire, Pewsey, Purton, Ramsbury, Reading, Ross on Wye, Royal Wootton Bassett, Salisbury, Shaftesbury, Shalbourne, Slough, Southampton, Stow, Stratford upon Avon, Stroud, Swindon, Tewkesbury, Thatcham, Tidworth, Trowbridge, Wanborough, Wantage, Warminster, Weston Super Mare, Wiltshire, Winchester, Windsor, Witney, Wokingham, Worcester, Wroughton and Yate.
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