The documentation for my 400 watt inverter says the *inverter will shut down if the input voltage drops below 9.5V+/-0.3V
In the Deep Cycle Battery faq listed here: http://www.windsun.com/Batteries/Battery_FAQ.htm (under "State of Charge")
it shows that my unsealed 85AH Costco deep cycle battery would be completely depleted at 10 volts, which is when my inverter would shut off. If this is correct, it would obviously harm the battery.
Does this mean I need to constantly monitor the voltage of the battery and cut it off manually? Get a better inverter where I can specify a cutoff voltage? Or is there some kind of extra cutoff attachment I can add to my setup? Please let me know if my logic is correct and what the best approach here to saving the life of my battery. Thanks!
*The inverter will operate from input voltage ranging from 10 volts to 15 volts. Optimum performance will occur when the voltage is between 12 volts and 14 volts. If the voltage drops below 10.5V+/-0.3V, an audible low battery warning will sound. The inverter will shut down if the input voltage drops below 9.5V+/-0.3V. This protects the battery from being over-discharged.