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Problem diagnosis · Sofar Solar

Sofar ME3000SP EPS Mode Fault — Neutral-Earth Bond & Backup Power Fix

Your ME3000SP has battery storage but doesn't provide backup power when the grid goes down. The most common cause on UK installations is a missing neutral-earth bond on the EPS circuit — the unit detects an earth fault and refuses to energise. This guide walks through the full diagnostic path.
  • AC-coupled BESS (2016–2021 installs)
  • Neutral-earth bond specialist
  • Uses SolarMan monitoring
ME3000SP not backing up?

We diagnose whether the issue is configuration, neutral-earth bond, changeover relay, or battery SoC — then tell you exactly what needs fixing.

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5.0
13 Trustpilot reviews
Trustpilot Google

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot
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Safety: The ME3000SP EPS circuit involves mains-voltage wiring and earthing. Neutral-earth bond installation and changeover relay work must be carried out by a qualified electrician. Do not modify consumer unit wiring yourself.

Diagnostics

5-step ME3000SP EPS mode diagnosis

The ME3000SP can provide backup power during grid outages, but only if three conditions are met: EPS mode is enabled, a changeover relay is installed, and the neutral-earth bond is present. Most failures trace back to one of these three.

1

Check EPS mode is enabled in the ME3000SP settings

EPS mode is a configurable option — it is not active by default. Navigate the ME3000SP LCD menu to the EPS settings screen, or check in SolarMan under device configuration.

EPS enabled = On: The unit will attempt backup power when the grid drops
EPS enabled = Off: The unit ignores grid outages entirely — no backup attempt

Many ME3000SP installations were commissioned without EPS enabled because the changeover relay wiring was never completed. If your installer went bust before finishing the EPS circuit, this is the most likely state.

2

Verify the changeover relay or transfer switch is installed

The ME3000SP requires an external changeover device to isolate backed-up circuits from the grid during an outage. Without it, EPS mode cannot function safely.

• Check the consumer unit for a changeover relay between the grid supply and the backed-up circuits
• Some installations use a manual transfer switch instead of an automatic relay
• If no changeover device is present, EPS cannot work — regardless of the ME3000SP settings

The changeover relay ensures the ME3000SP never back-feeds the grid during an outage — this is a G98/G99 safety requirement.

3

Check the neutral-earth bond on the EPS circuit

This is the single most common cause of ME3000SP EPS failure on UK installations. The mechanism is straightforward:

Why the neutral-earth bond matters
Normal operation: The neutral-earth reference comes from the electricity supply point (DNO transformer or your incoming supply)
During power cut: The grid disconnects — the neutral-earth reference is lost
Without local bond: The ME3000SP detects an earth fault condition and shuts down for safety
With local bond: A neutral-earth link on the EPS side of the changeover relay restores the reference — EPS works

This is particularly common on TT earthing systems (common in rural UK areas). A qualified electrician must install the neutral-earth bond link so that it is only active when the changeover relay has switched to EPS mode.

4

Confirm the battery has sufficient charge for EPS

The ME3000SP will not enter EPS mode if the battery State of Charge is below the configured EPS minimum threshold:

• Check current battery SoC on the unit display or in SolarMan
• Check the EPS minimum SoC setting — this should be higher than the normal discharge minimum
• If the discharge schedule drained the battery before the power cut, EPS will not activate

Set the EPS reserve SoC to at least 20% to ensure some backup capacity is always available. This means the normal discharge schedule should stop at 20% rather than draining the battery to the minimum.

5

Test EPS mode with a simulated grid outage

Once the above checks are complete, simulate a power cut to confirm EPS works end-to-end:

1. Ensure battery has charge — at least 30% SoC
2. Turn off main grid supply at the consumer unit
3. Wait 5–10 seconds — the changeover relay should switch
4. Check backed-up circuits — lights and sockets on the EPS circuit should have power

If the relay switches but the ME3000SP doesn't energise: The neutral-earth bond is the most likely cause. If the relay doesn't switch at all: The relay wiring or the relay itself needs checking.

The ME3000SP EPS problem — why it's so common

The Sofar ME3000SP was one of the most widely installed AC-coupled battery systems in the UK between 2016 and 2021. It was popular because it retro-fitted to existing solar installations without replacing the solar inverter. Many were installed under government incentive schemes by companies that have since closed.

The EPS (Emergency Power Supply) feature was a selling point, but in practice many installations were never fully commissioned for backup power. The changeover relay was not always installed, the neutral-earth bond was frequently omitted, and EPS mode was left disabled in the settings. Owners only discovered the problem during their first real power cut — sometimes years after installation.

The neutral-earth bond issue is specific to the UK because of the prevalence of TT earthing systems, particularly in rural areas. In countries with TN-C-S earthing, the neutral-earth reference is maintained differently and the problem doesn't arise in the same way. This means manufacturer documentation from China doesn't always cover the UK-specific earthing requirement, and installers unfamiliar with EPS wiring on TT systems missed the step.

Back to

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FAQ

ME3000SP EPS mode — common questions

The three most common causes are: EPS mode was never enabled, the changeover relay was not installed, or the neutral-earth bond is missing on the EPS circuit. On UK TT earthing systems, the loss of neutral-earth reference when the grid disconnects causes the ME3000SP to detect an earth fault and refuse to energise. A local neutral-earth bond on the EPS side of the changeover relay resolves this.
A neutral-earth bond connects neutral to earth at a defined point. Normally this exists at the supply point. During a power cut, the grid disconnects and the reference is lost. The ME3000SP detects this as an earth fault and shuts down. Installing a local bond on the EPS side of the changeover relay restores the reference and allows backup power to work.
Navigate the ME3000SP LCD menu to EPS settings, or check in SolarMan under device configuration. EPS mode shows as enabled or disabled. If it was never turned on during installation, the unit will not attempt backup power. Enabling it also requires the changeover relay to be installed and wired.
We can remotely diagnose whether the issue is configuration, SoC thresholds, or hardware. If the fault is a missing neutral-earth bond or changeover relay, on-site work by a qualified electrician is needed. We provide a clear diagnosis and specification so you or your electrician know exactly what to do. Many EPS issues turn out to be configuration rather than hardware.
In normal operation, the ME3000SP charges and discharges alongside the grid — importing cheap rate energy and supplementing solar self-consumption. In EPS mode, it operates as an island — the changeover relay disconnects from the grid and the ME3000SP powers the backed-up circuits directly from the battery. EPS only activates when the grid fails and the battery has sufficient charge above the EPS reserve threshold.
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ME3000SP not backing up during power cuts?

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