battery chargers

forgotmyname

Charging from a lower voltage is possible.But the losses are huge.

I have a laptop charger than will charge upto 20 volts from a 12v source. But the output is very limited.

I cant see how they converted the caravan to 9 volts. Where would you buy automotive 9 volt bulbs from?
Waterpump would be 12 volt. Fridge etc would also be 12 volt.

When its hooked upto the car its 12 volts also.

Mankysteve

I think its time for professional help or at least someone with a bit knowledge. I would suspect that the caravan was never converted to 9v, just that someone either accidentally put a 9v bat in there or just dodged in a 9v bat they had lieing around.

Check some of the interior light fitting and see what voltages the bulbs are rated at.

forgotmyname

9v would power most of the stuff but the amperage would be up.

Bulbs will be slightly dimmer. Fluorescent tubes may struggle though.
They will quickly turn black at the ends with low voltages.

pvt

mattyprice4004 wrote: »

Clearly electronics isn't your strong point.
If the voltage put out by the charger is lower than the battery voltage, no current will flow. The charger will likely be OK though, as they usually have diodes for this eventuality.

I'm not sure what else they would have in them that can rectify AC to DC?