Renewable Energy and Sustainability Forum
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Anyone wishing to register as a new member on the forum is strongly recommended to use a "proper" email address. Following continuous spam/hack attempts on the forum, "disposable" email addresses like Gmail, Yahoo and Hotmail tend to be viewed with suspicion, and the application rejected if there is any doubt whatsoever
Recent Articles: Navitron Partners With Solax to Help Create A More Sustainable Future | Navitron Calls for Increased Carbon Footprint Reduction In Light of Earth Overshoot Day | A plea from The David School - Issue 18
   Home   Help Search Login Register  
Pages: [1]   Go Down
Author Topic: Fridge, Inverters, and soft starters?  (Read 4705 times)
Hero Member
Offline Offline

Posts: 4320

« 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?).


Pic of wheel on day 1
7.2kW Waterwheel and 9.8kW PV
Hero Member
Offline Offline

Posts: 3575

« 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.

Navitron solar thermal system
30 x 58mm panel 259L TS
1200watts solar 120vdc
FX80 Solar controller
2 x Victron Multiplus II 48/5000/70
Cerbo GX & GX 50 touch
BMV 700
6kva genny
48v 1000ah
Grid Possibly coming soon
Pages: [1]   Go Up
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines
SMFAds for Free Forums
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!