sir donski, bat di ka nalang din bumili ng battery charger instead of an alternator, mas mabilis pa machacharge yung battery. also, use deep cycle batteries mas tatagal yan kesa regular battery.
or you can also try using an UPS(uninterruptible power supply) yung gamit sa mga computer. ditch the stock battery and replace it with bigger(automotive/marine) battery
http://www.youtube.com/watch?v=ViXHW...t-501-s&ei=UTF