I have found Trojan T105 6v battery to be a good low cost solution 225 A/= H I am buying factory rebuilt units for $50.00 each. I am using 24 in my bat= t bank. =20 =20 Bob Moors --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .