thanks for your good answer.
But 'what boiler' ......is that a metaphor or what ??

so your saying the sloshing of the amonia in the system .......or what ?

And you are saying that any *voltage drops* that occur at the fues,
connections etc,
will take away from what the heater element ultimately has to work with.
I know that's what you meant.
thanks again.
scott

----- Original Message -----
From: "David Beierl" <dbeierl@attglobal.net>
To: "Scott Daniel - Turbovans" <scottdaniel@TURBOVANS.COM>
Cc: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, July 22, 2008 7:11 PM
Subject: Re: Attn: Dometic Experts! - does the 12 volt function really work
?

> At 09:50 PM 7/22/2008, Scott Daniel - Turbovans wrote:
>>but on 12 volts driving - only drove 30 minutes so perhaps that's why it
>>doesn't seem to do much.
>>I did check that the relay under the seat energizes and suppies power to
>>one
>>of the fuses behind the driver's seat when the alternator is charging.
>>so is that 'just how they are' ? ..........ie. very slow in the 12volt
>>mode.
>
> Scott, half an hour isn't long enough.  Takes about that long to get the
> cycle running well after it stops.
>
> The 12v heater is just as powerful (85 watts) as the 110v one, but it's
> much more susceptible to problems from poor connections, because you're
> pushing 7.5 amps through the circuit.  So every bit of voltage that
> appears across wires, fuse, connectors etc. will disproportionately take
> away from the heater.
>
> Also, the fridge simply doesn't work as well on the road because of the
> same sloshing effect that keeps the boiler from going dry.  So for a true
> comparison you need to be standing still.
>
>
> --
> David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
> '84 Westy "Dutiful Passage," '85 GL "Poor Relation"