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
5
Start V is not programmable / disabled when
Use Batt % charge is enabled.
Start % autostarts the grid or generator
charge and charges the battery to 100%.
Avoid this charge by programming the Time-
of-Use settings in the Grid Setup.
Float V / Absorb V should be set to 54.4V if
not using battery-to-inverter communication,
(Ex. 3+ eVault classics).
Equalization should be set to 0 hours to
disable equalization.
A - Fortress requires 1 eVault or 2 eFlex per
SolArk inverter, which will max out its 185A
setting when using BMS control for properly sized batteries. When not using BMS control or for undersized battery
banks, limit this charge to 55A per eFlex or 100A per eVault. Call Fortress for LFP5/10/15 settings.
Grid Charge – Check this box for grid-tied arrays or off-grid arrays with generators.
Gen Charge – Check this box if tying in a <8kW generator to the generator breaker on the Sol-Ark.
Shut down % - is the low battery cut off
point which either shuts down the inverter or
transfers to grid power. This value should be
raised to 10% if not using the Time-of-Use
grid parameters function. Regularly cycling
the battery below 20% will reduce the
Fortress warranty.
Low Batt – provides an alert when the battery
hits this level. This adjustable setting is useful
to keep this setting equal to when the full grid
charge turns on.
Batt Resistance – may not be programmable/
disabled in BMS control. Don’t worry about it.
Restart – determines when the battery can be used again after reaching the shutdown %.
BMS_Err_Stop – disables the BMS communication alarm. It is up to you to select it or not.
Batt Empty V – Keeps a few volts in the battery to avoid locking the battery out during accidental deep
discharges. Set to 49V if the battery will be unattended for long periods of time.
185A for 2+ eFlex
185A for 1+ eVault
15%
0 Hours
5%
48V
49V