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 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 silkscreened PC boards that are manufactured in the USA, 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. 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.