Well done, Mr Squirrel! Now we just need to apply that figure to the  
amp/hour rating of the battery (hopefully not the starting battery!)  
and that should give you approx. run time.

BTW, my Propex HS1800 has kept me comfortable down to 16�F with the  
poptop down. I do not run the heater at night, so fuel and battery  
consumption are not really much of an issue for me. It does take quite  
a while to get the cabin warmed up, but it does the trick, especially  
while sitting on the back seat with a blanket over my legs which  
forces the heat where it's needed. If I had to do it all over again  
and had the $$, I'd go for more BTU's like the HS2800 delivers.  
However, the Propex heaters are  no competition when compared to the  
factory installed gasoline-burning furnace that was in my 84 westy. I  
don't know what the BTU output was on that thing, but it got the van  
warmed up quickly! Also used a LOT of amps and gas and could only run  
for about 15 minutes unless the engine was running.

Keith O.

On Jan 31, 2008, at 12:59 PM, Michael Elliott wrote:

> Well, 1.4 amps for one hour is 1.4 amp-hours (Ah) so if you run the  
> heater for 30 hours you'll use 42Ah.
>
> -- 
> Mike "Rocket J Squirrel" Elliott
> 71 Type 2: the Wonderbus
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> KG6RCR
>
>
>
> On 1/31/2008 9:40 AM Keith Ovregaard wrote:
>
>> According to the Propex website specs, the HS2000 uses 13kg propane  
>> in
>> 91.5 hours (1/3 lb. per hour) and 1.4 amps continuous. I am not sure
>> how many pounds the westy tank holds, but a typical BBQ tank is 20lbs
>> and 5 gallons. The westy is 3 gal. So, lets say there is 10lbs. That
>> would give you 30 hours of continuous heat.
>> Someone else want to do the math on the battery drain?
>> Keith O.
>> On Jan 31, 2008, at 5:54 AM, Automatic digest processor wrote:
>>> second battery was almost dead!!! So yes, it take some juice... and
>>> i would
>>> not count on this thing for a week in the cold wild unless the tank
>>> is full
>>> and you have  2 spare batteries. The fan motor must drain about 3-4
>>> amp an
>>> hour. The propane will outlast the baterry, that is for sure.