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Brand support · Pylontech Battery Storage

Pylontech Battery Support — US2000 / US3000 / US5000 BMS Faults & Inverter Pairing

Pylontech battery not charging, BMS communication fault, PYLON protocol pairing issues, or inverter compatibility problems — we diagnose Pylontech battery systems across all common inverter pairings. Independent battery specialists, not affiliated with Pylontech or your installer.
Free remote diagnostic £125 only if we fix it remotely
  • Not affiliated with Pylontech
  • US2000, US3000, US5000 & Force H2 supported
  • All compatible inverter pairings supported
Pylontech battery not working correctly?

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 diagnostic

Safety: If your Pylontech battery shows a red fault LED or unusual heat, isolate at the DC switch before investigating.

Within an hour they were online and after less than another hour had it all sorted. Good communication throughout.

Philip Gerrish · Nov 2026 Google

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

Shawn Carmichael · Aug 2026 Google

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.

Tim Hatt · Aug 2026 Google

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!

Dennis Koenen · Jul 2026 Google

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

Mr Andy Smith · Aug 2026 Trustpilot

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!

GEOFFREY EADE · Jul 2026 Trustpilot
Pylontech Faults

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.

Battery & Charging
Most common
Battery not charging overnight

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 →
BMS
BMS communication fault (PYLON protocol)

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 →
Common
Battery not discharging

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 →
Pairing
Inverter compatibility / pairing problem

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 →
Services

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.

✓ PYLON protocol communication audit
✓ Battery module LED status interpretation
✓ Inverter schedule & capacity configuration
Book remote diagnostic

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.

✓ PYLON protocol & baud rate matching
✓ Battery count & capacity setting
✓ TOU schedule optimisation
Book config session

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.

✓ Physical connection & cable check
✓ Safety-focused report
✓ Repair or replacement path
Discuss visit
Documents

Pylontech datasheets, manuals & warranty PDFs

Download datasheets, installation manuals and warranty documents for Pylontech battery systems and compatible inverters. Self-hosted and always current.

Product datasheets & specifications
Installation & commissioning manuals
Warranty terms & coverage documents
App & software setup guides
Wiring diagrams
Fault Codes

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.

·Battery communication & BMS faults
·Cell imbalance & BMS protection events
·Over-temperature & thermal management
·CAN bus & connectivity errors

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.

US Series (LV 48V)
US2000C — 2.4kWh per module
US3000C — 3.5kWh per module
US5000 — 4.8kWh per module
10yr warranty · IP20 · stackable
Force H2 (HV)
High-voltage architecture
Multi-tower / multi-rack configs
Requires HV-capable inverter
HV-qualified engineer for site visits
Communication
PYLON protocol (widely supported)
RS485 or CAN bus
Indoor installation (IP20)
Works with Solis, Sofar, Victron, Lux, SolaX…
We also support

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 brands
FAQ

Pylontech battery questions answered

Start with the paired inverter's monitoring platform — Pylontech batteries follow the inverter's schedule, not their own. Check the charge window is enabled, grid charge is on, and the SoC minimum is below your current battery level. If the schedule looks correct but charging still doesn't happen, look for a BMS communication fault in the inverter's event log — this stops the inverter from reading the battery's state.
Pylontech US series modules have front-panel LEDs indicating state: solid green = normal operation; flashing green = charging or discharging; amber = warning (commonly cell imbalance or high temperature); red = fault (often protection trip). When you have a stack of multiple modules, each module has its own LED — an amber on one module while others show green usually points to cell imbalance in that unit.
Pylontech uses the widely-supported PYLON protocol over RS485 or CAN bus, and common UK pairings include Solis, Sofar Solar, Victron, LuxPowerTek, and SolaX. Important: GivEnergy is a closed battery system — it only works with its own batteries, so Pylontech cannot be paired with it. 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. The inverter must be set to the correct battery type (Pylontech or PYLON protocol) — using generic lithium mode is a common commissioning error that causes BMS faults.
All three are 48V low-voltage LiFePO4 modules. The US2000C provides 2.4kWh per unit; the US3000C provides 3.5kWh; the US5000 provides 4.8kWh. Multiple units can be stacked to reach the required total capacity. All use the same PYLON protocol for inverter communication. For a given total storage target, fewer US5000 modules are needed compared to US2000C — making the US5000 more common in larger installations.
We start with a free remote diagnostic, reading your Pylontech stack through the inverter's monitoring. A remote fix costs £125, charged only if we fix it remotely. If the fault needs a site visit, that is from £295, and we quote it in writing first.
Allow about 30 minutes for the remote session. Have your inverter's monitoring login to hand, because that is where we read the BMS communication data and alarm history. Note which LEDs are lit on each module too, as that helps us narrow the fault down.
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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

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Call 07944 877 329 Book free diagnostic