We audit the full CAN bus communication chain — cable integrity, battery addressing, module count, and firmware compatibility. Most faults resolved remotely.
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What an Amazing service and so helpful . I have had problems with a faulty GivEnergy inverter and Ron has been so diligent in investigating and reporting on it . I’d give him more than 5 stars if I could for his help in diagnosis and potential solution. Thoroughly recommend .
Givenergy panels and battery had been offline for a couple of months after various changes by Givenergy to their app etc. Ron did a fantastic job of sorting it out - got things up and running almost immediately, followed by some fine tuning to get things fully configured. What a legend - great service, great comms, great result.
I left an enquiry few days ago and got a call back today from Ron. I have FoxESS battery and inverter that seemed not doing the right job and after only few questions, Ron told me exactly what I need to do to restart my system, without even seeing it. After almost 2 weeks of not being able to use my FoxESS equipment, today is finally up and running. Very professional and knowledgeable. Thanks Ron
quick service - sorted in 30 mins. well worth saving yourself hours of reading Facebook forums! thanks
Very happy with the support I got from Ron at Solar Tech Support with my GivEnergy battery problem. The battery having operated perfectly for 3 years suddenly stopped discharging. He sorted it out in minutes.
The Solar Tech Support company was the only one to respond to a request for someone to supply and fit a new inverter for our solar panels after our old one finally expired after 26 years. Ron kept us well informed throughout, came and ascertained that the issue was down to the inverter having failed then sourced and fitted a new one. He got the system up and running again, set up the wi-fi performance feedback and took away the old inverter for disposal. By acting promptly and fitting the job around existing commitments we were able to get our solar power unit back in operation with minimal delay in the short while before we were due to go away for a week. The work was carried out very professionally and we were asked to confirm that all was in order the following day. I was impressed that, having recently taken on additional work for GivEnergy customers we were able to keep our solar panel down-time to a minimum. I would highly recommend for prompt attention and first-rate service.
Safety first: Do not open the inverter or disconnect DC cabling while the system is live. If the UHome battery is showing error LEDs or unusual behaviour, isolate at the DC switch before investigating further. CAN bus cable checks can be done safely with the system powered down.
When a LuxPowerTek LXP inverter reports a BMS communication fault, the problem is in the communication link between the inverter and the UHome battery stack. Work through these steps in order — most faults are resolved at step 1 or 2.
The UHome battery communicates with the LXP inverter via a CAN bus cable — a standard RJ45 (ethernet-style) connector. A loose, damaged, or disconnected cable is the single most common cause of a BMS communication fault:
Try replacing the CAN cable with a known-good one as a diagnostic step. This eliminates cable damage as a variable.
In a multi-module UHome stack, each battery must have a unique address. The master module communicates with the inverter; slave modules communicate through the master via inter-module link cables:
One master module with a unique address. Each slave module with a different address. Master's CAN port connected to the inverter. Slaves linked to master via inter-module cables in sequence.
Two modules with the same address — typically after a replacement module is added without reconfiguring. This causes a CAN bus conflict and the inverter reports a BMS communication fault even though all modules are physically healthy.
Check the DIP switch or address setting on each module. The address is usually set via a small switch accessible on the side of the module.
The LXP inverter needs to know exactly how many UHome modules are in the stack. If the battery count in the inverter settings does not match the physical number of connected modules, the BMS protocol expects responses from the wrong number of units:
Check the battery count in the LuxPower portal under device settings, or on the inverter display under battery configuration.
LuxPowerTek releases firmware updates for both the LXP inverter and UHome battery BMS. A significant firmware version gap can cause communication protocol incompatibilities:
Firmware updates for UHome batteries typically require an engineer with the LuxPowerTek configuration tool. This is not a DIY operation.
If the cable, addressing, battery count, and firmware are all correct but the BMS fault persists, a controlled power-cycle can clear a latched communication error. The battery goes off first at its own switches. That stops power flowing, so no DC isolator is opened under load, which is what burns the contacts and causes arcing. Follow this order:
The inverter should re-establish BMS communication on startup. If the fault returns within minutes, one of the battery modules likely has a hardware-level BMS failure and needs isolating from the stack for individual testing.
Safety: If you are not confident with DC isolators and battery switches, do not attempt this. Contact an engineer.
The UHome battery (LFP-2400) communicates with the LXP inverter using the CAN bus protocol — a robust industrial communication standard used widely in automotive and energy storage. In normal operation, the BMS sends the inverter continuous updates on cell voltages, temperature, state of charge, and charge/discharge permissions. When this communication link breaks, the inverter has no way to know the battery's state — so it stops all battery operations as a safety precaution.
BMS communication faults on Lux Power systems are almost always configuration or cable issues. We see them most commonly after stack expansions (new module added without address or count update), after electrical work near the inverter (CAN cable disturbed), and after firmware updates (protocol version mismatch). Genuine BMS hardware failures in UHome modules are rare but do occur — typically presenting as a fault that persists through power-cycles and cable replacements, isolated to a single module in the stack.
Return to the Lux Power brand hub to explore other common faults and services.
Lux Power support hubTell us the fault message, how many UHome modules you have, and whether any work has been done recently. We'll audit the full CAN bus communication chain and resolve it.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
Every message is read and answered, so please don’t send it twice; that only slows the queue.
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