On 28/04/2011 15:50, Michael Watterson wrote: > I'd choose the Solar panel to be able to charge battery at discharge > rate x 2 at least on an overcast day and supply the equipment current at > your location, Also I'd set the elevation to be optimal for midwinter rather than the=20 "average". Russell is likely the resident Solar panel Expert. I've used Truck battery and smart charger for Voice repeater PSU. We=20 powered it off the mast site power, which has its own major array of=20 batteries, meaning we got 8 to 10hrs Transmit time (and 100hrs RX) after=20 everything else on site was dead... --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .