CirKits.com (http://www.cirkits.com/) sells a variety of electronic kits that can be used for powering 12 Volt equipment from solar power. Kits include: SCC3 12V/20A solar charge controller, withstands reverse polarity on both PV and Battery terminals BVM1 12V color-coded LED voltmeter with L.V. warning beeper, withstands reverse polarity DAS1 12V/10A dark-activated switch for automated lights, can be modified for light-activated operation which is useful for solar-powered beacons LVD1 12V/15A low voltage disconnect with auto-reconnect and L.V. signal Bundle two different kits and save $4.95, details can be found at cirkits.com. These kits have been designed for power efficiency and have very low RF emissions. The kits use high quality double-sided silk screened PC boards, schematics are included. The photo shows a solar powered Ten-Tec Argo QRP transceiver that uses the SCC3 charge controller and the BVM1 low duty cycle LED voltmeter with a 10 Watt PV panel and a 7AH lead acid gell-cell battery. The SCC3 can support much larger PV arrays and batteries. Bulk discounts are available for ham clubs, send email for info. Satisfaction is guaranteed. If you have trouble getting your kit up and running, I will repair and align it for a small fee plus return postage. CirKits.com is a one person (ham) business in operation since 2000. Email: firstname.lastname@example.org.