Solar & Electrical | Services & Systems

Solis AC Coupled Battery Storage Inverter Faults and Repairs

Established in 2005 Ginlong (trading as Solis) have grown to become the third largest inverter manufacturer by sales volume in the world. Arriving relatively late to the UK, since the launch of their Series 2 (2G) inverters to the UK they've since grown from strength to strength, achieving the No1 spot for distributed solar in the UK in 2019.

The most popular Solis AC Coupled Battery Storage inverter model in the UK is the RAI-3K-48ES-5G

Solis AC coupled storage inverters have an LCD display on the front of the chassis, which providing it's working, will highlight any errors with the inverter or the batteries that it runs. We have listed and described common faults with Solis inverters and what action to take to resolve them below:

All Solar Inverter Fault Codes, Warnings and Troubleshooting

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Solis AC Coupled Battery Storage Inverter Fault Codes and Explanations:

• OV-G-V - Over grid voltage - The inverter is measuring a grid (mains) voltage that is too high in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for a solar engineer to visit to establish whether the fault lies with the inverter, the inverter supply circuit or with the grid.


• UN-G-V - Under grid voltage - The inverter is measuring a grid (mains) voltage that is too low in relation to the parameters that the 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 inverter, the supply circuit or with the grid.


• OV-G-F - Over grid frequency - The inverter is measuring a grid (mains) frequency that is too high in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for a solar engineer to visit to establish whether the fault lies with the inverter or with the grid.


• UN-G-F - Under grid frequency - The inverter is measuring a grid (mains) frequency that is too low in relation to the parameters that the 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 inverter, the supply circuit or with the grid.


• NO-GRID - No grid voltage - The 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'. 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 inverter, the supply circuit or with the grid.


• OV-BUS - Over DC bus voltage - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• UN-BUS - Under DC bus voltage - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• GRID-INTF02 - Grid interference - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• OV-G-I - Over grid current - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• AC Transient Overcurrent - This could be an issue with the backup port wiring or an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• IGBT-OV-I - Over IGBT current - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• DC-INTF - Battery overcurrent - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• IGFOL-F - Grid current tracking fail - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• IG-AD - Grid current sampling fail - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• OV-TEM - The inverter is too hot. This could be due to a number of factors, for example 1) If the inverter is exposed to direct sunlight 2) If the inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate 3) The inverters 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.


• INI-FAULT - Initialization system fault - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• OV-IgTr - Grid Transient Overcurrent - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• OV-Vbatt-H - Battery Hardware Overvoltage - Check if the battery is correctly connected or the battery contactor is disconnected, Restart the battery, Restart the inverter, if the fault still exists contact us.


• OV-ILLC - LLC Hardware Overcurrent - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• OV-Vbatt - Battery Overvoltage - 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 batteries or more likely the inverter. Restart the inverter and restart the batteries, if the fault persists contact us.


• UN-Vbatt - Battery Undervoltage - 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 batteries or the inverter. Restart the inverter and restart the batteries, if the fault persists contact us.


• DSP-B-FAULT - Comm. failure between main and slave DSP - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• NO-Battery - Check that the battery is connected correctly, restart the batteries, restart the inverter, if the fault persists contact us.


• OV-Vbackup - Inverting Overvoltage - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• Over-Load - Overload in backup mode - The power attempting to be drawn from the batteries when in backup mode (i.e. when no grid connection is present) is greater than the inverter can handle. In the first instance switch off the device that is drawing the power and restart the inverter. If this fault persists after a safe shutdown and restart or if EPS mode isn't enabled then contact us.


• CT-Fail - This is a communications error between the 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.


• MET_Comm_FAIL - This is a communications error between the inverter and the mains with the CT clamp/meter. Shutdown the system, disconnect and reconnect the CT clamp/meter and restart. If this condition persists then contact us.


• CAN_Comm_FAIL - CAN communication fault - This is a communications error between the inverter and the batteries. Shutdown the system, disconnect and reconnect the communications cable and restart. If this condition persists then contact us.


• DSP_Comm_FAIL - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.


• Alarm-BMS - The inverter has picked up that the batteries management system alarm has been activated. Restart the batteries and if the condition persists then contact us.


• BatName-FAIL - Wrong Battery Model - This is an error code that would only be expected to be seen on initial configuration. If after the system has been safely shutdown and restarted this condition persists then contact us.

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Solar Inverter Recycling: - Recycling Solis Inverters

Solis 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 Solis 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.

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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.

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.

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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.

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.

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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

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.

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Mains/Grid Isolation and Surge Protection

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.

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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.

Solis Hybrid Inverter Faults and Repairs Arriving relatively late to the UK, since the launch of their Series 2 (2G) solar inverters to the UK they've since grown from strength to strength, achieving the No1 spot for distributed solar in the UK in 2019. The most popular Solis hybrid inverter models in the UK are the the RHI-3K-48ES-5G, RHI-3.6K-48ES-5G, RH!-4.6K-48ES-5G and the RHI-5K-48ES-5G. BSI - PAS 63100:2024 - Protection Against Fire of Battery Energy Storage Systems for use in Dwellings This 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 power to a house using a portable generator We look at changeover switches, the importance of earthing, generator loadings, isolating non essential loads. Where to locate the generator and how best to safely isolate the grid/mains power supply and switch to a generator supply. Solis Inverter Faults and Repairs Solis solar inverters have an LCD display on the front of the chassis, which providing it's working, will highlight any errors with the solar inverter or the solar PV system that it runs. We have listed and described common faults with Solis solar inverters and what action to take to resolve them.

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What Our Customers Say:

"Had a tricky fault on my (8 year) old system which Glen narrowed down and has now sorted at a very reasonable price. We have also had our faulty inverter replaced by In Balance; would recommend if he covers your area!" Peter Nobes, Bath

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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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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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