The HRSi conveniently brings together a Rutland Windcharger charge regulator with an input for up to 160 Watts of photovoltaic panels in a single easy to install device. Multi-stage charge control delivers appropriate charge levels required to ensure your batteries get the maximum power they are able to retain and remain float charged. Suitable for charge regulation of the Rutland 500 and 900 Series Windchargers (504, 505, 914i and FM910-4 Furlmatic models) ...