Why 10.5 Volts for Inverter Shutdown? – The Inverter Store
Why 10.5 Volts for Inverter Shutdown?2020-08-05T23:26:55-07:00

Project Description

Battery Depth of Discharge AIMS Power AGM batteries

State of Charge 12 Volt battery Volts per Cell
100% 12.7 2.12
90% 12.5 2.08
80% 12.42 2.07
70% 12.32 2.05
60% 12.20 2.03
50% 12.06 2.01
40% 11.9 1.98
30% 11.75 1.96
20% 11.58 1.93
10% 11.31 1.89
0 10.5 1.75

A battery is considered dead at 10.5 volts. The answer is related to the internal chemistry of battery – at around 10.5 volts, the specific gravity of the acid in the battery gets so low that there is very little left that it can do. In a dead battery, the specific gravity can fall below 1.1. The DOD voltage is only achieved after the load is removed and the battery is at a resting state, typically a recovery of @ least 2 hours. Under a load the battery voltage can drop to 11.00V and then recover to 12.5V once the load is removed. Because of this our inverters are designed to accept a wide range of DC voltage down to 10V.

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