Dear abador The easiest thing you can do: get an used UPS of appropriate power with good batteries. Then connect your solar panels over an appropriate controller, or step down converter directly to the batteries.... N.B. Are you sure, the main voltage is 240 VAC, as South America mostly runs on american sort of 120V, 60 Hz? I would have a few UPS lying around my lab, for free. (instead of throwing them away). good luck einstein0