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Author Topic: Fridge, Inverters, and soft starters?  (Read 4651 times)
guydewdney
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« on: August 21, 2010, 09:38:31 PM »

For my motorhome (32' long NHS bus) we are thinking about a domestic fridge, with a 24->240v inverter and soft starter on the compressor (and a bit of jiggery pokery with thermostats and beefy 24v relays....)

But - has anyone run a domestic fridge using a soft starter to prevent the inverter being spanked by the startup spike?

24v compressor fridges are 600+ quid - and they (aparently) just ahve a small inverter and soift starter inside them - whereas a domestic fridge is cheap (or free) and a 24v UPS is cheap (or free - hint hint - anyone got one?).

guy
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Justme
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« Reply #1 on: August 22, 2010, 12:09:41 PM »

The 12v ones have a real 12v motor.

We run a 240 one on a pure sine inverter (Victron 12/3000/70/16) with no problems. But that has a 6kva peak & is connected to a large battery bank so can support high loads without dropping the bat V. Another good tip us to use a cable that has been calc'ed for the V drop not amp carry capacity. Do it the other way & the fridge wont start cos the V at the fridge will drop.

That said I would still go for a mains fridge, they are cheaper, more choice, can be repaired easier by a standard repair man (or you) using standard parts. Yes a dc one might use slightly less power but the savings on the cost can go to recouping some of that difference in another area.
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