Friday, Jan 01, 2010 at 10:00
That's the sort of thing I was concerned about Trackker. The difference between ac and dc and their different requirements shouldn't be ignored.
The more I think about this one the more I favour a completely seperate 12v system. The existing wiring simply will not allow the necessary current handling. In simple terms, to keep the present wattage rating on lamps etc, if you drop the voltage by a factor of 20, you must increase the current by a factor of 20. Losses in the wiring, and the limited available energy, will make this totally impracticable.
The other factor that's easily overlooked is the need to minimise load. Running from a battery does not allow the luxury of unlimited lighting and electricity use, something that would be largely hidden from users if the system looked just like it does at home where there are some huge coal burning power stations providing almost unlimited electricity.
On 240 volts (until recently when compact flourescent lamps have become more common) we might run 60W bulbs. In 10 hours, one 60W lamp will use half the energy stored in a 100 Ah battery, or with 12 such lights, we'd half flatten the battery in less than an hour!!
Cheers for 2010
John
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