Paul C. Buff, Inc. Technical Forum

We don't have an official way of discharging, however, you should not exceed the limits of the inverter. You should also make sure there is plenty of circulation, and be sure it does not overheat.

The inverter has indicators of charge. You can unplug the charger and turn the unit on and look at the battery indicator. Alternatively, a full charge takes 3-4 hours. You can estimate 1.5 to 2 hours to be approximately 50%. It is not expected for one hit the 50% mark exactly.

Thanks TS. Regarding the "useful life of 2-3 years regardless of storage", did the manufacturer give you any indication of what the failure symptoms might be at the end of that life? I just pulled three batteries out of storage that were a little over 2 years sitting in storage. I ran them through a full charge/discharge/charge/discharge/charge cycle and they all ran just over 60 minutes powering the 100 watt light bulb. When they reach their EOL, will their capacity start to diminish or will they just flat-out croak?

We expect a gradual decrease in power capacity, though a sudden decrease in capacity is possible. Also, batteries at the end of life can quit taking a charge. This can result in generating excess heat. Always supervise the batteries when charging.