Why not install a small solar panel to keep the battery topped off? The overall load on that single battery can't be very demanding and you could always top it off with the charger if it doesn't keep up. Len Cable Entropy _http://groups.msn.com/TrawlerMV/mventropy.msnw?Page=1_ (http://groups.msn.com/TrawlerMV/mventropy.msnw?Page=1)