I will sell the assembled MPPS regulator BEL for the direct power supply of the boiler from photovoltaic panels. Input voltage DC 60-430V, coil power up to 3kW, together with BEL boiler power switch PN4316 to automatically switch the boiler to the mains in the event of a power failure. from photovoltaics. New, unused. More info www.bel-shop.eu. 0915863848