RE: Going green
We seem to have gone down a different path, but just for the record, and not trying to be contentious...
Most small generators have 12 volt output that provides 12-12.5 volts whilst running under load. The same as a charged 12 volt battery, and that's all this 12 volt output does. It replaces a battery, and it is not a battery charger. A battery connected to a 12V output will never get fully charged even if running all day.
This output is designed to connect TVs, lights, mobile phone chargers etc.
This output will not fully charge a 12 volt battery because that requires over 14V to 14.5 max, much more than a "12V" generator produces simply because if it did, it would damage whatever you plug in the 12V output.
The way to charge a battery with a generator that does not have a battery charger as such, is via a battery charger, a transformer that turns your 240V AC ( or 110 AC) output into 14.1V DC
If you can find a DC/DC transformer that is 12V < 14.1V you can use it to charge the batteires by running it off your 12V otuput and also to run your truck heater...hoever you should check if there is enough watts output for that purpose, usualy this 12 v output are not the main and can not channel the whole power of the genset.
-- Edited by Marc1 at 03:01, 2008-03-27