k...looking at using 14 A/hr 12VDC battery. In theory if I have a 480mA cu= rrent source at 18V from a solar array, it would take 2 hours to charge bac= k 1 A/hr of = capacity....? I need to keep a constant 12VDC, so plan on using a boost = convertor and monitor the battery itself to keep it from discharging below around 9= or 10V. = If the load itself is 1.2A, I'm actually thinking that 14A/hr battery act= ually wont suffice since that would again in theory, allow a total 1.4A draw for 10 hours, b= ut means it will drop the battery voltage to zero? Not a good thing to do = to a battery. And I have to have the total draw of about 8 to 10 hours. = So maybe a pair of batteries, or split the load to a set of batteries may= be? = --------------------------------- Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ coun= tries) for 2=A2/min or less. -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist