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Sofar · Common problems & faults

Sofar common problems & faults

STS engineers diagnose and repair 2 common problems & faults on Sofar systems. Click any topic below for a full step-by-step guide, or book a free remote diagnostic and we'll tell you what the fix is.
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Absolutely wonderful support. I have a GivEnergy system that was installed in 2022, and a firmware update was flagged in the app, so I proceeded to update the software .... and immediately regretted it, as my inverter came up with an error, and was not working at all! With no GivEnergy support available, and my installer saying there was nothing he could do, I googled help, and found Ron. What a stroke of good luck! Submitted an on line enquiry late morning, and received phone call just after 5 pm, and later that evening Ron was able to supply me with old firmware no longer available on the GivEnergy web site. I was then able to update the firmware using a GivEnergy youtube video as reference, and hey presto the system was back up and running. One further slight adjustment by Ron and we are back normal. What a relief. I have no hesitation in recommending Solar Tech Support if you have a problem. Great service! And if you are a GivEnergy system owner, whatever you do, DO NOT UPDATE FIRMWARE!

Neill Ginn · Jul 2026 Google

Ronald tried to help solve a fault with communications between battery and inverter. Whilst in the end a hardware fault was diagnosed and not possible to fix remotely his attempt to fix and guide me through steps to fault find were appreciated. He was available at a time convenient to my availability. Great service for anyone requiring independant tech support for their solar or battery system.

Ben Charlton · Jul 2026 Google

My GivEnergy hybrid inverter + battery system had worked faultlessly for 3 years when it suddenly stopped charging and discharging the battery. On contacting my supplier, who had used a sub-contractor for the installation work, I was provided with an email address at GivEnergy but, as it turned out, this is only for GivEnergy Software who are not able to assist. A Google search led to the Solar Tech Support web site, which contains a wealth of helpful information. I requested a remote solar diagnostic, and after providing Ron access to my inverter, he was able to identify and fix the problem within minutes. I am very impressed by Ron’s expertise and knowledge, which included useful information on the current state of GivEnergy Ltd. I would thoroughly recommend Solar Tech Support.

Simon Riddle · Jun 2026 Google

Sts does a extremely great job. Thank you.

Roy Morgan · Jul 2026 Google

Ron is one of those rare finds - an engineer's engineer. He insightfully and accurately diagnosed the problems with our GivEnergy system, very quickly, which helped get us back on track. We will be using him again!

Geoff Palmer · Sep 2026 Google

⭐⭐⭐⭐⭐ 5-Star Review – Solar Tech Support Installing solar panels is only the first step! To get the best possible performance and maximise your investment, you need to make sure your system is configured correctly and all settings are properly optimised. **Solar Tech Support did exactly that for me, and I couldn't be happier with their professional service!** Their knowledge, expertise, and attention to detail helped me optimise my solar system to get the most out of it. If you already have solar panels and battery storage, I highly recommend contacting Solar Tech Support for professional advice, system optimisation, and technical support. Don't just install solar panels – make sure you're getting the maximum benefit from your investment! ⭐⭐⭐⭐⭐ Highly recommended! Thank you, Solar Tech Support, for your excellent service!

Karolis Bagdonas · Oct 2026 Trustpilot

Last updated

What actually goes wrong with Sofar kit

Two faults account for most of the Sofar calls we get, and both are covered in detail below. The first is grid disconnection. The inverter drops off the grid with a G-OV, G-UV, G-OF or G-UF code in the SolarMan event log. In the UK the usual culprit is local grid voltage climbing past 253V at midday when local solar systems all export at once. The inverter is doing its job, not failing. A G-ISO code is the odd one out: that points to a DC insulation fault and needs on-site testing.

The second is specific to the ME3000SP, the AC-coupled battery unit installed between 2016 and 2021. It stores energy fine, then provides nothing in a power cut. Usually that's a missing neutral-earth bond on the EPS circuit, EPS mode never enabled at commissioning, or no changeover relay fitted at all.

Both start the same way: a free remote diagnostic. We read your SolarMan logs and settings, tell you what's actually wrong, and whether anything on-site is needed. No fix, no fee.

FAQ

Sofar fault questions answered

Because grid voltage or frequency has gone outside G98/G99 limits, not because the inverter is failing. The most common UK cause is local voltage rising above 253V during peak solar hours when neighbouring systems all export at once. Check the SolarMan event log: G-OV means overvoltage, G-UV undervoltage, G-OF overfrequency, G-UF underfrequency. The inverter reconnects automatically when conditions settle. A wrong grid code setting can also cause needless trips, and a G-ISO code means a DC insulation fault, which is a different problem entirely.
Often, yes. Wrong grid code configuration, EPS mode never enabled on an ME3000SP, and battery SoC thresholds set below the EPS reserve are all sorted through SolarMan and the unit settings. Some faults need hands on site: a missing neutral-earth bond or changeover relay needs a qualified electrician, and a G-ISO isolation fault needs insulation resistance testing at the property. Persistent grid overvoltage is a DNO matter; we help you build the evidence and can set an export limit in the meantime.
The remote diagnostic is free, on a no fix, no fee basis. We review your SolarMan event log and settings, identify whether the fault is grid conditions, configuration, or hardware, and tell you straight. If the answer is on-site work, such as a neutral-earth bond for ME3000SP backup, you get a clear specification your electrician can quote from, so you only pay for work that actually needs doing.
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