On 2 Nov 2006 at 9:25, David C Robie wrote: > Contacts on the air cond types are rated at 15A. Tractor, at start > of charge and for a good while draws about 17. The charger is only delivering about 17 amps at ~40V, isn't it? Is it really that inefficient that it's putting 1000 watts into heat? Ken Muldrew.