Pylontech

Role in our panels

How we use Pylontech

Pylontech Force H2 and US3000C battery modules use lithium iron phosphate (LFP) chemistry — lower energy density than NMC but superior cycle life (3000+ cycles to 80% DoD at standard rate), intrinsic thermal stability, and no cobalt content. Force H2 (100Ah, 4.8 kWh per module) and US3000C (74Ah, 3.55 kWh) are the primary residential modules; Pelio-L (432Ah, 20.7 kWh LMFP) covers commercial and villa applications. Modules stack vertically with BAT8 high-current connectors; the BMS module at the top of the stack manages cell balancing, protection (over/under voltage, over temperature, overcurrent), and communication. Pylontech batteries do not communicate directly with KNX — they use CAN bus (500 kbps, Pylontech CAN protocol) or RS-485 (9600 baud, Pylontech RS-485 protocol) to communicate with the host inverter. The inverter (Victron MultiPlus-II via Cerbo GX with VE.Can adapter, Fronius Symo Gen24 via SolarAPI, SMA Sunny Boy Storage via BMS CAN) receives the battery BMS data and re-exposes it via its own Modbus TCP server. For Victron: Cerbo GX Modbus TCP registers 840–845 expose battery voltage, current, power, SOC, and state. For Fronius Gen24: the inverter's SolarAPI v1 REST endpoint provides SOC and power. For SMA: Modbus TCP registers include battery SOC. Intesis IN701KNX reading Cerbo GX (or Fronius/SMA) Modbus TCP maps battery SOC to KNX GA 9/2/2 (DPT 5.001, 0–100%) and battery power to GA 9/2/3 (DPT 13.010, W — positive=charging, negative=discharging). KNX self-consumption logic: IF SOC (GA 9/2/2) > 90% AND PV surplus (GA 9/0/0) > 1000W THEN activate SG Ready State 3 on heat pump — this exploits near-full battery plus ongoing surplus to maximise self-consumption. IF SOC < 20% AND grid status = fault (island mode GA DPT 1.005) THEN activate KNX 'Emergency' scene. KNX load shedding and overnight off-peak charge logic: during the day, battery charges from PV via inverter (no KNX involvement in charging control — inverter handles this). At 23:00 (off-peak tariff start), KNX time controller checks SOC: IF SOC < 60% AND off-peak tariff GA = 1 THEN write MultiPlus mode register via Cerbo GX Modbus TCP to charger-only mode (Reg 33 = 0) — grid charges battery at minimum import cost. At 06:00 (peak tariff start), KNX writes MultiPlus mode = 3 (normal hybrid) — battery discharges to offset peak tariff grid import. This tariff optimisation with Pylontech + Victron + KNX logic is the most common complex automation scenario in PanelCraft villa projects.

Pylontech batteries communicate with the inverter (Victron, Fronius Gen24) via CAN bus or RS-485. The inverter (Victron Cerbo GX, Fronius GEN24 webserver) then exposes battery data via Modbus TCP: SOC (%), charge power (W), discharge power (W), battery voltage (V), fault status. Intesis IN701KNX reads these Modbus values and maps them to KNX GAs: GA 9/2/2 (battery SOC DPT 5.001). KNX logic: SOC > 90% AND PV surplus > 1 kW → SG Ready State 3 on heat pump (exploit excess battery capacity). SOC < 20% → load shed scene (HVAC setback, pause EV charger).