Hmmmm.... I find this interesting..... However for the record, most batteries do not last very long at temperatures below about 40 degrees farenheit. Has anyone considered a Thermo-photaic device? if properly designed it could act as a heat source to keep things like batteries warm, and, also as an electricity source. During the peak temperature period, you could shut down the thermo-photaic device, and run on battery power. Neat thing about this, is if you design the TP device properly, it will not only allow you to run at lunar night, but also recharge the batteries so that you have power during the day.... just a thought. Grey GRAEME SMITH email: grysmith@freenet.edmonton.ab.ca YMCA Edmonton Address has changed with little warning! (I moved across the hall! :) ) Email will remain constant... at least for now.