We analyse the AlphaCloud alarm history and cell-level data to determine whether the fault is transient, rebalanceable, or needs module replacement.
Book your free remote diagnosticBack to AlphaESS hubIndependent — not affiliated with AlphaESS.
Our 3 year old GivEnergy batteries froze. They were showing 0% on the app, but they were fully charged. Some how Ron took over our inverter and remotely cured the problem. We live in King’s Lynn, he is in Leeds I believe. Very grateful.
My 90-year-old father-in-law had a solar system installed nearly three years ago that never worked properly and kept tripping out. Neither the original installer nor GivEnergy could resolve the issues, and we were even pushed towards replacing the system entirely when GivEnergy went bust. I contacted Ron at Solar Tech Support via WhatsApp, and within a few hours he had diagnosed multiple faults — including incorrect wiring that posed a potential fire risk. He carried out a home visit in Nottingham for £295 (including parts), fixed everything, completed firmware updates, and ensured the system was fully operational. Since then, it has worked perfectly. Ron was knowledgeable, responsive, and took the time to explain everything clearly. Highly recommended — excellent value and complete peace of mind.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
STS were incredibly responsive and helpful In diagnosing an issue with my GivEnergy inverter. Although distance meant it was impractical for me to use them to fully solve the issue, I’m grateful for the help and detail they provided. Don is a real professional gent and a hero in my eyes.
I can’t praise this firm enough. After hearing my solar panels rattling in very windy conditions, I contacted Solar Tech (as my installers no longer trade). Ronald was fantastic at explaining what he thought the issue was likely to be. Communication was great throughout keeping me fully updated. The team worked really hard on the day to carry out the necessary work. I can now sleep soundly at night without worrying about the solar panels on my roof. I would thoroughly recommend this firm. Thank you for sorting the problem out.
What a fantastic service. Had my fault diagnosed within minutes and actually managed to resolve the issue remotely within a few minutes more. This guy is like a “Solar Batman” helping consumers fix their problems using his extensive industry knowledge and expertise. Outstanding service. Thank you so much.
Safety first: An isolation error is a safety-critical alarm indicating a potential ground fault. Do not open the inverter or touch DC cabling. Isolate the system at the DC switch and AC isolator before any physical investigation. If you smell burning or see damage, call an electrician.
Battery alarms on AlphaESS systems fall into two categories — cell voltage issues (BMS chemistry) and isolation faults (safety/wiring). The first step is identifying which type you have, then following the correct diagnostic path.
Log into AlphaCloud or the AlphaESS app and navigate to the event log or alarm history. The alarm code tells you exactly what triggered:
If AlphaCloud is offline, the fault code may also be visible on the SMILE inverter's LCD screen.
These are fundamentally different problems with different severity levels:
Internal to the battery module. One cell has drifted — e.g. 3.5V while others are at 3.1V, exceeding the BMS imbalance threshold. The battery stops charging or discharging to protect the cells. May be correctable with rebalancing.
External to the battery. The inverter has detected current leakage between the DC battery circuit and earth. Could be moisture, damaged cable insulation, loose earth, or rodent damage. System must be isolated and inspected by an engineer.
If the alarm code is unclear, we can identify it from the AlphaCloud event log during a remote diagnostic.
Cell imbalance in SMILE B modules typically develops gradually, especially in systems that have been running for several years or that sit at very high or low SoC for extended periods:
You can check the cell-level voltages in AlphaCloud if your firmware version supports it, or we can extract this data during a remote diagnostic.
An isolation error is safety-critical. Isolate the system first — DC switch off, AC isolator off. Then check for:
If you are not a qualified electrician, do not investigate further beyond visual inspection. Contact an engineer for isolation resistance testing.
After addressing the suspected cause, power-cycle in the correct sequence:
Monitor AlphaCloud for 24–48 hours. A transient cell alarm that does not return was likely a BMS communication glitch. An isolation alarm that returns immediately after power-on indicates an unresolved ground fault requiring professional investigation.
Safety: if the isolation fault recurs, leave the system isolated and contact an engineer.
The SMILE B battery uses a built-in Battery Management System (BMS) that continuously monitors individual cell voltages, temperatures, charge and discharge currents, and isolation resistance. When any parameter drifts outside the safe operating window, the BMS triggers a protection alarm and the inverter stops battery operations to prevent damage. This is the BMS doing its job — the alarm means the system is protecting itself.
Cell voltage alarms become more common as batteries age. LiFePO4 cells degrade at slightly different rates, and over years of cycling the voltage spread between cells gradually increases. AlphaESS systems that run Octopus or time-of-use tariffs with deep daily cycling tend to show this sooner than lightly used systems. Isolation faults are less about battery age and more about installation environment — garages with temperature swings that cause condensation, cable routes that are exposed to the elements, or installations where rodents have access to wiring.
Return to the AlphaESS brand hub to explore other common faults and services.
AlphaESS support hubTell us the alarm code from AlphaCloud and what happened before the fault appeared. We'll analyse the event log, cell-level data, and isolation test results to give you a clear diagnosis.
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