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Lux Power · Common problems & faults

Lux Power common problems & faults

STS engineers diagnose and repair 2 common problems & faults on Lux Power 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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After recently changing my fuse board the ct clamp broke, this meant my inverter was not communicating properly with my GivEnergy system. After several people letting me down, finally got put in touch with Ron. He came out within 24hours & resolved the fault within an hour, no fuse just got on with it. Work was tidy & arrived when he said he would. Ron followed up a few days later to confirm all was still good, great service from all involved.

Mr Paddy · Jul 2026 Trustpilot

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

Solar Tech Support is an absolute lifesaver. My solar and battery system stopped working completely, but after one quick phone call, they fixed the problem straight away. The original provider, GivEnergy, has gone into administration, leaving me entirely without support from the original installers. It was a terrible situation on GivEnergy’s part, but thankfully, Solar Tech Support came to the rescue!

sohaib maroof · Jul 2026 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

Great experience with STS great communication from Ron, very helpful and knowledgable. Installed me a second Givenergy battery to help take the strain off my original 9.5 that needs refurb due to a weak cell. They secured me an 8.2 arranged install. Levi arrived the whole install was done within 1.5 hours - great tidy job. Worked with me to alter my setup to allow easy removal of my 9.5 when i can get it away for refurb - very happy with their service and its reassuring to know there is a company out there that can help look after my givenergy system

Alan Glaister · Sep 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

Last updated

What actually goes wrong with Lux systems

Most Lux faults we see come down to two things: the battery not charging on the cheap rate overnight, and the LXP inverter losing contact with its UHome battery stack. Neither usually means dead hardware.

The charging one is nearly always a settings problem in the LuxPower portal. A charge window that never got saved, the grid charge toggle left off, or the inverter clock stuck on GMT after the clocks go forward, so the window fires an hour late and misses the off-peak rate. Our guide to Octopus cheap-rate charging on Lux walks through it step by step.

The UHome BMS communication fault is usually a loose CAN cable, duplicate module addresses, or a battery count that doesn't match the physical stack. We diagnose both remotely, free, and you pay nothing if we can't fix it.

FAQ

Lux fault questions answered

Check three things in the LuxPower portal: a charge window saved for your off-peak hours, grid charge enabled, and the inverter clock. Lux inverters don't always follow UK daylight saving, so a window set for 00:30 can fire at 01:30 in summer and miss the cheap rate entirely. That clock offset is the single most common cause of seasonal charging failures. If those check out, look at the SoC target and charge current limit: a battery already at target, or charging too slowly, won't fill in the window.
Usually, yes. Charging schedule problems, clock offsets, grid charge settings and SoC targets are all sorted through the LuxPower portal in a single remote session. UHome BMS communication faults are mostly configuration too: battery addressing, module count and firmware mismatches can be diagnosed and corrected without a visit. If it turns out to be a damaged CAN cable or a genuine hardware fault in a battery module, we'll tell you straight and give you a clear report to use for a warranty claim.
Nothing. The remote diagnostic is free, and it's no fix, no fee. If the problem is something we can put right remotely, like a TOU schedule or clock correction, remote fixes are £125 and you only pay when it's fixed. If we can't fix it, you pay nothing and you'll still know exactly what's wrong with the system.
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