Fronius Symo GEN24 Plus + BYD Battery-Box Premium HVS

Closed-loop compatibility, protocol setting and cabling. Best status: verified closed loop.

Field-sourced data. Verify against the current official manual and firmware before commissioning — a wrong setting can damage equipment.

RS485 Verified closed-loop confidence: high

Protocol: Modbus RTU (RS485)
Inverter setting: Commission BYD first in the BeConnect app, then add the battery in Fronius Solar.web → BYD Battery-Box Premium HVS; inverter FW ≥ 1.9.7-0 (single tower); HVS min 2 modules
Battery / DIP: Set BYD module count in BeConnect; RS485 A/B → Fronius Modbus terminals; terminate the RS485 ring; do not bond the cable shield at the inverter

BYD BMU ↔ Fronius (Modbus RS485) (installer-made shielded CAT5+ RS485 cable — NOT CAN)

Modbus RTU RS485

This pair is RS485/Modbus, not CAN.

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Comm cable / adapter Battery-Box Premium HVS Symo GEN24 Plus

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