Hi Scott, If you look at the product description for the Windtura 750 it says under the section "Battery Bank Specifications" that the Windtura 750 is "Suitable for 12 and 24 volt battery banks". It will work on a 48 volt battery bank but you will not start charging the battery bank until approximately a 14 mph wind. I have attached a screen shot below of the battery bank specifications which are listed on the product description page for the Windtura 750. The actual image below can be found on the website here : http://www.windynation.com/products/wind/generators-and-pmas/windtura-750-complete-wind-turbine-kit
