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AlphaESS · Common problems & faults

AlphaESS common problems & faults

STS engineers diagnose and repair 2 common problems & faults on AlphaESS 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. The WiFi is the exception: it's never remote work. If the WiFi still won't connect after the guide, we can set it up on site, from £195.
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Rated 5.0 on Google Read all 151 reviews

Unfortunately, only weeks after Givenergy went into receivership, our system failed. Our installers were unhelpful in the extreme but Solar Tech Support were able to diagnose a terminal problem with our Gen 1 AC3 inverter. They advised regarding the available options and (having decided to buy a replacement Givenergy inverter as the simplest solution) they were able to get us up and running. They made themselves readily available to talk through the process and manage any faults. I would have no problem recommending them.

Stephen Paul · Aug 2026 Google

Thank you for your diligence. On this occasion the battery was able to be saved but they have given a route to hopefully arrange a repair from the manufacturer.

David Bateman · Jun 2026 Google

Wow... a firmware update to my inverter sent the whole system into meltdown – the battery discharged, and the house seemed to be drawing power, and the solar, who knows where that was going? Aghhh... A short email exchange with Roland and Solar Tech Support sorted the problem... the firmware had reversed a setting (from when it was installed), and the CT clamp needed to be reversed. As soon as I had done that, the world returned to normal. Thanks, Roland; there is no way I would have come to that conclusion. Would I recommend them? You bet! Worth the fee? You bet, again!

Pete Hawkins · Jul 2026 Google

Great advice from Ronald at Solar Tech Support, got my inverter back on line and stable.

Mervyn Ethelston · Aug 2026 Google

Ronald was great to help me sort out my giv energy inverter issue since company has gone bankrupt in april 26.

Ankur Kr. Gupta · Jun 2026 Google

My GivEnergy solar and battery system is failing intermittently, GivEnergy is in administration and so is my installer, so it was a relief to get Ron’s expert advice.

Steve Trossell · Jun 2026 Google

Written by · Independent Solar Engineer Last updated

What actually goes wrong with AlphaESS kit

Two faults bring AlphaESS owners to us above all else: AlphaCloud going offline and battery alarms on SMILE B modules. The offline one is rarely serious. The communication dongle on the SMILE inverter has lost its internet connection, usually after a router swap or a WiFi password change. On 4G installs an expired SIM does the same. Either way, the system usually keeps running, so check the inverter's own screen. The dongle only talks 2.4GHz WiFi, which catches plenty of people out.

Battery alarms need more care. A cell voltage alarm means the BMS has caught cells drifting apart inside a SMILE B module, and mild imbalance can sometimes be rebalanced with full charge and discharge cycles. An isolation error is different: that is a ground fault, it is safety-critical, and it needs a qualified engineer rather than guesswork.

As independent engineers we start with the AlphaCloud event log and cell-level data, work out whether the fault is transient, remotely fixable or a hardware job, and tell you straight. Start with AlphaCloud offline if your app shows no data, or send us the alarm code and we will diagnose it for free.

Common problems & faults

2 common problems & faults we cover

Each topic links through to an engineer-led step-by-step guide.

AlphaCloud offline — WiFi Dongle fix

AlphaCloud shows no data, the app says your system is offline, and you have no idea if your SMILE inverter is even working.

See AlphaCloud offline

Battery Cell Alarm & Isolation Error

Your AlphaESS shows a battery alarm — the BMS has detected a cell-voltage imbalance in a SMILE B module, or the inverter has flagged an…

See Battery Cell Alarm & Isolation Error
FAQ

AlphaESS fault questions answered

Probably not. AlphaCloud is monitoring only, so when the communication dongle on the SMILE inverter loses its internet connection you lose the app data, but the system usually keeps running, so check the inverter's own screen. Then look at the dongle LED: solid means connected, flashing means trying, off means loose or dead. Router changes, WiFi password updates and expired 4G SIMs are the usual culprits, and a power cycle often brings it back.
Some of them: battery cell alarms are diagnosed remotely from the AlphaCloud event log and cell-level voltage data, and mild imbalance can sometimes be corrected with guided full charge and discharge cycles. WiFi isn't remote work: if the dongle won't reconnect after the checks in our AlphaCloud offline guide, we can set it up on site, from £195. An isolation error is a ground fault and needs a qualified engineer on site, though we still diagnose it remotely first.
The remote diagnostic is free, no fix, no fee. We go through the AlphaCloud logs, alarm history and cell-level data and tell you exactly what is wrong. If we can fix it remotely, the fix is £125. If we can't, you pay nothing. Where hardware is involved, a failed dongle or a site visit for an isolation fault, we give you the part reference or a clear scope and quote before anything is booked.
Free remote diagnostic

Need an AlphaESS engineer?

Tell us what's happening with your AlphaESS system. Free remote diagnostic, no-fix-no-fee. Most configuration faults resolved during the 30-minute session. We don't set up or diagnose WiFi remotely or over the phone: it's quicker and more reliable done on site.

  • No fix, no fee covers remote fixes. On-site work is quoted in writing before we start.
  • Emergency response within 4 hours during business hours
  • Written report regardless of outcome

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