Sol-Ark Integration Guide

Rev 2.0 08-28-21
Fortress Power - Sol-Ark Inverter Guide
505 Keystone Rd, Southampton, PA 18966 . [phone]. [e-mail] . Fortresspower.com
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Step 11 – Updating firmware (optional):
All Fortress batteries are now shipping with firmware necessary for closed-loop communication with Sol-
Ark inverters. While firmware updates are not something an end user should regularly perform,
installers get in the habit of bringing the Fortress firmware update tool and Windows laptop to site
during any site visit to update battery firmware and access detailed battery information that can speed
up commissioning and diagnostics. Do not update battery firmware while the battery is under load.
Fortress installers should request a firmware update tool at https://www.fortresspower.com/support by
filling out a support ticket. End users and installers who have not filled out the dealer form may
purchase the tool for ~$50 by filling out the support ticket.
Visit https://www.fortresspower.com/firmware for instructions.
Step 12 – Operating in Voltage Based Control (for
paralleled eVault Classics):
The eVault Classic BMS is not capable of BMS control for 3+
eVaults. Voltage controls can actually be more accurate when the
battery is near full or near empty – there is little if any real
function difference between running in %-based BMS control or
voltage based control. Use this chart to approximate battery
voltage and state of charge for “Grid Limiter” settings. Also,
change the float and absorption charge to 54.4V instead of 56V.
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54.4V
54.4V