Within an hour they were online and after less than another hour had it all sorted. Good communication throughout.
Pylontech Battery Support — US2000 / US3000 / US5000 BMS Faults & Inverter Pairing
- Not affiliated with Pylontech
- US2000, US3000, US5000 & Force H2 supported
- All compatible inverter pairings supported
Most Pylontech BMS and pairing issues are resolved remotely. Tell us the battery model, your inverter brand, and what you're seeing.
Book your free remote diagnosticSafety: If your Pylontech battery shows a red fault LED or unusual heat, isolate at the DC switch before investigating.
Called spoke to Ron. Was very informative and more importantly listen to the issues regarding my system. Was very professional and tackled the problem and had my system back on it's way. Thank you once again Ron
I contacted Solar Tech Support because I had a problem with my legacy GiveEnergy installation. within 24 hours they had diagnosed the problem and offered advice on resolution. Because they were unable to fix the problem there was no charge! This despite numerous time consuming emails. I am currently trying to engage with the original installer but if that is unsuccessful I will go back to Solar Tech Support and ask them to repair the system with a retrofit. Very knowledgeable and responsive. I highly recommend them.
Ron very quickly diagnosed what was wrong with my GivEnergy system. Unfortunately the kit has died after only 3.5 years of use-which is quite sad and timing couldn’t be worse with GivEnergy gone bust. Ron gave me advise on how to handle this with my installer. I’m hoping they’ll be forthcoming, but if they aren’t i now have a good idea how to deal with that. Thanks a lot Ron!
My solar panels stopped producing unexpectedly, contacted Ron who assisted me initially remotely and then visited to correctly diagnose that the problem was on the roof. Within a month the solar panels are now up and working, kept me up to date with when scaffolding arriving and the lads who checked the solar panels, a very professional team, organisation and service
Brilliant. He fitted a new dongle and set the system up properly. Even better, he explained why the storage batteries don't work in a power cut - not correctly wired up - expensive to fix, but a simple turn of the master switch will give emergency power. He is the third technician to look at this issue and the only one to resolve it. Friendly and appoachable, comes when he says he will and reasonable charges. What's not to like!
Common Pylontech problems we diagnose
Pylontech is one of the most widely deployed battery brands in the UK — the faults we see are consistent and well-understood. Most are resolvable remotely.
Pylontech batteries don't hold their own schedule — charging is controlled by the paired inverter's TOU configuration. If the battery isn't charging overnight, start with the inverter's monitoring platform. Check that the charge window is enabled, grid charge is on, and the SoC minimum is below your current charge level.
See diagnostic guide →The inverter has lost communication with the Pylontech BMS. Pylontech batteries use the widely-supported PYLON protocol over RS485 or CAN. Common causes: wrong protocol or baud rate selected on the inverter, damaged communication cable, or DIP switch addressing errors in a multi-module stack. Diagnosable remotely from inverter event logs.
See diagnostic guide →Pylontech battery at 100% but the inverter isn't drawing from it. Check the inverter's discharge schedule and minimum SoC threshold. If a BMS protection trip is active (e.g. cell imbalance, over-temperature), the battery will hold off discharge until cleared. Check Pylontech LED status — flashing amber often indicates a cell balance issue.
See diagnostic guide →Pylontech batteries work with open-protocol hybrid inverters (Solis, Sofar, Victron, Lux, SolaX) but not closed systems like GivEnergy. Fox ESS lists only its own high-voltage batteries for its hybrid inverters, so a Pylontech battery is not a supported pairing there and may affect the warranty. The inverter must be set to use the correct battery type (Pylontech/PYLON, not generic lithium). A mismatch between expected and actual battery capacity — common when adding modules to an existing stack — can also cause pairing failures. We verify the full communication and capacity configuration.
See diagnostic guide →The US series are low-voltage (48V) modules (US2000C: 2.4kWh; US3000C: 3.5kWh; US5000: 4.8kWh). Common issues in multi-module stacks: one module triggering protection and shutting down the whole bank, incorrect master/slave DIP switch setup, or cell imbalance in older units reducing available capacity. LED status patterns on the front panel indicate which module has faulted.
See diagnostic guide →The Pylontech Force H2 is a high-voltage battery system (up to 614V) used with compatible HV inverters. Common issues: insulation fault on first commissioning (loose HV bus bar connection), BMS master/slave assignment errors in multi-tower setups, or inverter HV battery type selection mismatch. Requires HV-qualified engineer for physical inspection.
See diagnostic guide →EPS/backup mode is controlled by the paired inverter, not the Pylontech battery. If backup power failed during a grid outage, the inverter's EPS circuit may not have been commissioned, the backup load may exceed the EPS output rating, or the Pylontech battery may have had a BMS protection active that prevented discharge.
See diagnostic guide →What we do for Pylontech battery owners
Remote Pylontech Diagnostic
We review inverter logs, PYLON protocol communication data, and battery BMS error history to find the fault — whether it's in the battery, the inverter, or the communication layer.
Inverter Pairing & Configuration
We configure the correct PYLON protocol, baud rate, battery capacity, and module count on the paired inverter. Works with Solis, Sofar, Victron, LuxPowerTek, SolaX, and other open-protocol inverters.
On-Site Pylontech Inspection
RS485/CAN cable verification, DIP switch inspection, multi-module stack health check, and module replacement assessment. HV-qualified engineer available for Force H2 systems.
Pylontech datasheets, manuals & warranty PDFs
Download datasheets, installation manuals and warranty documents for Pylontech battery systems and compatible inverters. Self-hosted and always current.
Pylontech fault code index
Seeing an error code from your Pylontech battery? Our fault code index explains what each code means, common causes, and safe next steps.
About Pylontech batteries — what you need to know
Pylontech is one of the world's largest LiFePO4 battery manufacturers and has one of the highest install bases of any battery brand in the UK residential solar market. Their most widely deployed products are the US series — low-voltage (48V) stackable modules: US2000C (2.4kWh), US3000C (3.5kWh), and US5000 (4.8kWh). These pair with most hybrid inverters via the PYLON RS485 or CAN protocol. For higher-capacity systems, the Force H2 provides a high-voltage architecture. US series batteries are typically rated IP20 for indoor installation with a 10-year warranty.
Pylontech batteries are inverter-agnostic by design, using the PYLON protocol that is supported by most major hybrid inverters. Common UK pairings include Solis, Sofar, Victron, LuxPowerTek, and SolaX inverters. GivEnergy is a closed battery system and is not compatible with Pylontech. Fox ESS lists only its own high-voltage batteries for its hybrid inverters, so a Pylontech battery is not a supported pairing there and may affect the warranty: see our Fox ESS support hub and our guide to adding a battery. Because the schedule is held by the inverter, most charging problems are inverter configuration issues rather than battery faults. The most common queries: Pylontech US2000 not charging, Pylontech BMS communication fault, Pylontech US3000 LED status, US5000 pairing issue, and Pylontech not discharging. STS provides independent support — not affiliated with Pylontech.
STS supports all major inverter and battery brands. If your Pylontech battery is paired with a specific inverter, visit that brand's page for inverter-specific guidance.
Browse all supported brandsMore Pylontech help
Solar battery not charging from solar or the grid? This covers every common cause. Free remote diagnostic — no fix, no fee. Same-day.
See battery not chargingIndependent Pylontech problems support across the UK — 2 faults STS engineers diagnose and repair. Free remote diagnostic, no fix no fee.
See Pylontech common problems & faultsDownload Pylontech datasheets, installation manuals, warranty PDFs, app guides and wiring diagrams. US2000C, US3000C, US5000, and Force H2 batteries.
See documents & downloadsPylontech battery questions answered
Ready to fix your Pylontech system?
Tell us your Pylontech model, the inverter it's paired with, and what you're seeing. We'll diagnose the fault — usually same day.
- Not affiliated with Pylontech
- No fix, no fee
- All compatible inverter brands supported
We’re busier than ever. Thank you for your patience.
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.
We use cookies to measure traffic and ads, sharing limited hashed data with Meta and Google. Decline keeps only essential cookies. Privacy policy
Got a solar fault or need a quick answer? Drop us a message and we usually reply within a few minutes. Mon–Fri, 9am–7pm.