How can I determine 50% discharge on my XW's battery bank?
Since the battery voltage is "pulled down" under load, and then "bounces back up" when load is removed, the only way to determine
state-of-charge (when going by voltage alone) is when they are AT REST. The most accurate way to determine 50% discharge is install
a battery monitor such as the Conext Battery Monitor : http://solar.schneider-electric.com/product/conext-battery-monitor/