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pdscaz
pdscaz

Posted: Thu Mar 27, 2014 2:44pm

Post Subject: electric volts which to choose ?

as my 12v fridge needs replacing is it time to switch to 24v ? my lighting is all led 10/30v can change waterpump tv from lap top no inverter and alternator can be upgraded or replaced the advantages seem lower cable losses longer belt life ( the 24v alt rated @70amp the12v=@140) (Bosch) what can go wrong ?

Tony-B
Tony-B

Posted: Thu Mar 27, 2014 3:16pm

Post Subject: electric volts which to choose ?

Right, 746 watts = 1 hp. The "power" the alternator belt has to transmit is rated in hp or torque. Now, 70 amps @24 volts = 1680 watts. 140 amps at 12V = 1680 watts. Both alternators require the same amount of "power" to drive them so I doubt belt life would be any better. The figures are likely to be over 30% higher than I quoted. Next cable size, yes you can use cables that are half the thickness for a 24 volts system but you already have the cables so where is the gain apart from any new work. Most, if not all the fridges I have looked at recently seem to be dual voltage rated (12/24) so no difference there. Are you sure that you can get a 24 volt charger for your laptop and any phones? I suspect you might end up buying a 24 to 12V dropper and doing the charging at 12V. Likewise the truck boys seem to use a lot of 24 - 12 v droppers for things like radios and TVs. As to what can go wrong - See how easy it will be to obtain a 24 volt water pump when yours fails at 16.00 on a bank holiday Saturday. There may be arguments for 24 volts on a new boat but my view is very few if any for an existing 12V boat.

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