... optional; Batteries: General for lead-acid batteries, small micro-system, can also be used nickel metal hydride batteries, nickel- ... generally 12VDC, 24VDC, 48VDC. In order to 220VAC to provide electrical power, solar power generation system will need to be issued by ... There are two kinds of home solar system available. The stand-alone system is ideal for remote locations where running conventional ...