Fortress Power eFlex MAX 5.4 Battery Deeply Discharged
What it means: The battery has been discharged too far to operate normally.
What to do
Isolate the affected battery from the system. Measure voltage from the negative booster port to the positive terminal. Once confirmed, connect a 48V 5A DC max charger to the negative booster port and positive terminal and begin charging. Once 48V is reached, proceed with commissioning.
When to call service
The manual lists steps the owner can take. If the code comes back after them, or you are unsure, contact an authorized service dealer. The unit stops or will not start until the cause is cleared.
Source: official Fortress Power manual, page 30, read . Summary of the manual, not a reproduction.
Models this manual covers
Other eFlex MAX 5.4 codes
Questions
What does Fortress Power Battery Deeply Discharged mean?
The battery has been discharged too far to operate normally. (Fortress Power manual for the eFlex MAX 5.4, page 30.)
How do I fix Fortress Power Battery Deeply Discharged?
Isolate the affected battery from the system. Measure voltage from the negative booster port to the positive terminal. Once confirmed, connect a 48V 5A DC max charger to the negative booster port and positive terminal and begin charging. Once 48V is reached, proceed with commissioning.
Fuel, gas and electrical work on a home battery is for qualified technicians; follow the safety section of the manual. All 3 eFlex MAX 5.4 codes →