Battery voltage out of range

The battery inverter reports that measured battery voltage is outside its permissible measuring range, either too high or too low, and names the master or slave device on the affected line. If voltage is too low, the usable battery capacity may be too small, for example because the battery has aged. A heavy load switching on can then make the battery voltage collapse. For low voltage, disconnect the DC loads and charge the battery, make sure all battery cells work, and add load shedding if DC loads are installed. If voltage is too high or above the target charge voltage, check that all DC sources are correctly connected and configured and that the battery capacity is sufficient. On some storage controllers, a battery meter out-of-bounds flag shows meter voltage or frequency outside acceptable bounds, and this makes the meter reading invalid. To find weak cells, compare voltages across the battery bank over time, after correcting for temperature, discharge rate and age. Infrared imaging shows high-resistance cells and corroded terminals as hot spots.

<!-- review notes

• sentence 4: support check: partial - DC source connection/configuration checks and battery capacity sufficiency are stated, but capacity check is only for VBATMAX with a 65 V condition; BatVtgHi text is truncated.
• c5 dropped at review: The NREL passage ties hot IR cells to high internal resistance and loose or corroded connections, not to battery voltage being out of range, so the claimed link between symptom and observation is not in the source.
• sentence 4: review: partial - The DC-source connection and configuration checks are stated for over-range and BatVtgHi, but the passages tie the battery-capacity check to the VBATMAX rows when parameter 120.02 BatVtg is above 65.0 V, and the sentence drops that condition. -->