Sol-Ark Sol-Ark 15K + Fortress Power eVault Max 18.5

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 (RS485)
Inverter setting: Battery menu → BMS Lithium Batt 04 (BMS in control); comms into the Sol-Ark port labelled Battery/CANBUS; battery end into the master eVault RS485 port
Battery / DIP: eVault DIP ON for end batteries, OFF for middle; Battery ID sequential (0 if single); Protocol ID = 1 (Sol-Ark)

Fortress eVault ↔ Sol-Ark (directional crossover: eVault pins 3+5+6 → Sol-Ark pins 6+7+8; pre-made cable ships from 03/2022)

Modbus RS485, custom 3+5+6→6+7+8

This pair is RS485/Modbus even though the Sol-Ark port is labelled 'CANBUS'.

Code	Cause	Fix
No battery data on line 2	Wrong cable direction / Protocol ID / DIP	Set Protocol ID 1; DIP ON at chain ends; follow the cable labels — a battery data line appears when linked

Get the right parts

Comm cable / adapter eVault Max 18.5 Sol-Ark 15K

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