Ask PYS: Power

Voltage Draw on AGM Batteries, on May 04, 2016 asked:

What is the minimum voltage permissible to draw the house AGM batteries down to, and what would be the preferable minimum for longer battery life? - Gerry


Considering that you have a battery monitor, best is to use amp-hours versus basing yourself with voltage to determine battery capacity. With an AGM battery you can easily bring it to 50% of capacity and even down to 30% of capacity. If you had to go with voltage, this would be 12.2 VDC at 50% or around 12 VDC at about 30-40% of capacity. But remember voltage fluctuates depending on load.  – Jeff