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Date:         Thu, 31 Jan 2008 16:10:16 -0800
Reply-To:     Michael Elliott <camping.elliott@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Michael Elliott <camping.elliott@GMAIL.COM>
Subject:      Re: Propex and outside temperature
Comments: To: Keith Ovregaard <kovregaard@COMCAST.NET>
In-Reply-To:  <DF5D497C-FBCE-483C-A256-D1AC812FEC00@COMCAST.NET>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

To better zone in on what size battery one should use, it would be useful to find out if the Propex has a minimum voltage rating for its blower motor -- I'm guessing that the heater might shut off if the motor turns too slowly to move sufficient air. Lower battery voltage will likely cause a slower motor.

-- 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 3:17 PM Keith Ovregaard wrote:

> 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. >


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