Join Date: Feb 2010
Location: Narragansett Bay
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Inverter Low Battery Cutoff
Our inverter has a settting, where it will automatically discontinue inverting below a set value. It came from the factory, set to 12.2 volts.
When under a heavy load to run a 110v appliance, the voltage drops quickly. This was my scenario this morning.
Woke up, at anchor, and house found batteries at 12.6v and the SmartGuage says 83% State of Charge.
Used the inverter to make a pot of coffee. I saw a load draw over the shunt of 101 DC amps, with only the coffee pot on for about 10 minutes. Voltage was reading 11.9, while under load. I lowered the cutoff, to see what would happen. When the coffee was done, I shut the inverter off. After a minute of rest, the batteries were at 12.5v and the SG read 77% SOC. The SOC drop seems right for our 400 Ahr Gel house bank.
What is a safe inverter cutoff voltage while under such a severe load? Youíd never allow a battery to drain to a resting 11.9v, but I understand it is different for a temporary high load. I just need a floor.
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