Fitting of the Duoetto hot water heater

Submitted: Saturday, Jun 22, 2013 at 22:57
ThreadID: 102895 Views:5131 Replies:2 FollowUps:0
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I have fitted a Duoetto HCE-10 hot water unit into my van. I run a SSB 130Ah battery with 130w portable solar panel and a CM3024Z regulator. My problem is that when I switch it to 12V the battery power drops away rapidly, it draws 300W at 25Amps.
I have been told the battery should run it quite happily, everything is new.
Can anyone shed some light on this problem, thanks.
Phil
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Reply By: Member - TheFox3305 - Sunday, Jun 23, 2013 at 08:59

Sunday, Jun 23, 2013 at 08:59
there is a reason why gas and diesel hot water systems are so popular for vans and 12 volt is not.
below is from the warranty card from your hot water system. the last line is important. they are really made for cruisers with the engines running, not vans on solar.

Electrical Connections:
240 volt mains power. Plug unit in to standard 10 amp power point.
12 volt DC power.
Black 5 mm large ground wire. Connect to earth point or negative battery terminal. Red 5 mm large positive wire. Connect to house battery or other suitable 12 volt power supply.
Black small ground wire. Connect to earth point.
Red small positive wire. Connect to switched power source.
Important: To avoid draining the engine crank battery the Red small positive wire must be connected to switched ignition power source.
AnswerID: 513619

Reply By: Member - J&R - Sunday, Jun 23, 2013 at 11:29

Sunday, Jun 23, 2013 at 11:29
So it is a 300 watt heating element that draws approx 25 amps.
Which would mean a 130AH battery would last, at most 5 hrs, realistically 3
And the 130 watt solar will be supplying 8 amps per hour best case. And then only for about 8 hrs per day. Best case.

It will run it quite happily....for a while.
AnswerID: 513636

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