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Growatt AC Coupled Battery Storage Inverter Faults and Repairs

Established in 2011 in Shenzen, China, Growatt launched it's first products for the UK market in 2013. Growatt is now one of the top 4 solar inverter manufacturers in the world, operating in 180 countries. In 2021 Growatt became the world's largest residential solar inverter supplier.

Growatt AC Coupled Battery Storage inverters are supplied with a 10 year manufacturers warranty so even if the initial installer is no longer trading then there is a good chance that if there is found to be a fault with the inverter that it can be repaired/replaced under the manufacturer's warranty.

Growatt AC Coupled Battery 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 solar PV system that it runs. We have listed and described common faults with Growatt AC Coupled Battery Storage inverters and what action to take to resolve them below:

All Solar Inverter Fault Codes, Warnings and Troubleshooting

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Repair Growatt AC Coupled Battery Storage Inverter

 

 

Growatt AC Coupled Battery Storage 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 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.

  • No AC connection - 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.

  • AC V Outrange - The inverter is measuring a grid (mains) voltage or a grid impedence that is either too high or 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.

  • AC F Outrange - The inverter is measuring a grid (mains) frequency that is either too high or 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.

  • Error 408 - 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.

  • Output High DCI - The inverter is measuring too much current (I) from the batteries. 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 with the inverter. We would advise that the DC side of the system is disconnected using the DC Isolator installed between the batteries and the inverter (if available) and contact us to test the DC side of the system including and excluding the inverter.

  • Error 407 - Auto Test Failed - The inverter has recognised a problem (which may be temporary) upon initialisation at startup. If after the system has been safely shutdown and restarted this condition persists then contact us.

  • Error 411 - Internal Communications Failed - This is an internal inverter communications fault between the master and slave processors. If after the system has been safely shutdown and restarted this condition persists then contact us.

  • Error 405 - Relay 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.

  • Error 417 - Sample 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.

  • Error 418 - DSP and COM firmware version mismatched, system fault - 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 is most likely an internal problem with the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.

  • Error 120 - Model set up does not meet with certification - 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 is most likely an internal problem with the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.

  • Error 121 - This is an internal inverter communications fault between the master and slave processors. If after the system has been safely shutdown and restarted this condition persists then contact us.

  • Error 122 - Bus Voltage 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.

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Solar Inverter Recycling: - Recycling Growatt Inverters

Growatt energy storage 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 Growatt storage inverter, we will be pleased to help you recycle it.

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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.

Solar Power System Testing, Servicing & Maintenance

 

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.

Solar PV Inverter Replacement

 

Mains/Grid Isolation and Surge Protection

Mains/AC Surge Protection Solar PV Systems

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.

Mains/Grid Isolation and Surge Protection

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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.

/Solar PV Information Articles

Growatt Inverter Faults and Repairs

Established in 2011 in Shenzen, China, Growatt launched it's first products for the UK market in 2013. Growatt is now one of the top 4 solar inverter manufacturers in the world. The MTL-S Series solar inverters were widely installed in the UK from 2013 through to 2019.

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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.

Ground Faults, Isolation (ISO) Faults, RISO Faults and Insulation Resistance Faults with Solar PV Systems

After 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.

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What Our Customers Say:

"Contacted Glen after being let down by 2 companies. He visited promptly, researched my system and assisted me with getting my solar system up and running again. Amazing man. Will definitely be my first and only port of call for any future issues. Friendly, supportive, knowledgeable and reliable. Highly recommend him." Margaret Bissett, Chisledon

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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.

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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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