Electric Heater, Considering installing a DC Thermal Ducted Heater |
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Electric Heater, Considering installing a DC Thermal Ducted Heater |
sgetsiv |
Oct 20 2014, 10:05 AM
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#1
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Former 914 Owner :( Group: Members Posts: 159 Joined: 20-June 08 From: Portland, OR Member No.: 9,192 Region Association: Pacific Northwest |
I have headers (of course) and was thinking I could install one of these directly into the factory ducting:
http://www.my12voltstore.com/12_Volt_Ducte...p/sd12-4000.htm I still have my booster fan, nice flappers, J tubes and plenty of ducting... they make a 50 amp model as well. It would need to be located in the engine bay in my opinion... |
ClayPerrine |
Oct 20 2014, 10:08 AM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,410 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
You will need a new, high amp alternator. The stock one only puts out 55 amps.
I put in an electric heater for one winter, and I only drove to and from work. Had to put the battery on a charger every night. |
GeorgeRud |
Oct 20 2014, 09:30 PM
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#3
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Once the car is started, how many amps does it take to keep it running (assuming no other electrical draws other than brake lights and turn signals as required)? I've never heard any numbers on how many amps an ignition system draws.
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r_towle |
Oct 20 2014, 09:33 PM
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#4
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Custom Member Group: Members Posts: 24,560 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
It's interesting that Clay mentioned this.
With two amps, it felt funny when driving with the stereo on full blast, when I turned it off it ran better.... Gotta see who makes a bigger alternator. |
mgp4591 |
Oct 20 2014, 09:44 PM
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#5
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914 Guru Group: Members Posts: 5,366 Joined: 1-August 12 From: Salt Lake City Ut Member No.: 14,748 Region Association: Intermountain Region |
Subaru makes a bigger alternator! (IMG:style_emoticons/default/lol-2.gif)
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r_towle |
Oct 20 2014, 10:08 PM
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#6
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Custom Member Group: Members Posts: 24,560 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Right , 8k for an alternator upgrade. |
rick 918-S |
Oct 20 2014, 10:13 PM
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#7
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Hey nice rack! -Celette Group: Members Posts: 20,417 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
Bigger alternator requires more ponies to run it. So I don't know what you have for hp but any gains will likely be negated while running the heater. Fuel mileage will suffer as well.
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Mark Henry |
Oct 21 2014, 06:33 AM
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#8
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
A 40amp draw is huge and 8000 BTU is not much when heating a cold car.
We're talking clothes dryer draw (in amps) and the average dryer puts out 22,000+BTU |
ClayPerrine |
Oct 21 2014, 06:58 AM
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#9
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Life's been good to me so far..... Group: Admin Posts: 15,410 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
A 40amp draw is huge and 8000 BTU is not much when heating a cold car. We're talking clothes dryer draw (in amps) and the average dryer puts out 22,000+BTU Yea, but the clothes dryer is running a 240V. The car is only running 12V. There is a big difference in the available power between 240V and 12V. A 12V car battery will only get a dryer's heater elements slightly warm. Here is the math for it: A 12V heater at 40amps is generating 480 watts. 480 Watts converts to 1638 BTU. The dryer you list above, at 22,000 BTU is pulling 6447 Watts. That works out to 27 amps at 240 Volts. ===================== The ignition system on a 914 will only draw a few amps. It is when you start running lights and wipers to deal with the rain/snow/night that you will exceed the output of the alternator. |
mgp4591 |
Oct 21 2014, 07:31 AM
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#10
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914 Guru Group: Members Posts: 5,366 Joined: 1-August 12 From: Salt Lake City Ut Member No.: 14,748 Region Association: Intermountain Region |
Right , 8k for an alternator upgrade. True... unless you've already got the swap done. (IMG:style_emoticons/default/shades.gif) |
Rob-O |
Oct 21 2014, 08:18 AM
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#11
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Senior Member Group: Members Posts: 1,251 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region |
100 amp GM one wire alternators fit in there like a glove. No more voltage regulator on the board either. I've seen a few of these alternators that need slight maching to fit, but most bolt right in. I've got one in mine and it works well.
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stugray |
Oct 21 2014, 08:29 AM
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#12
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
100 amp GM one wire alternators fit in there like a glove. No more voltage regulator on the board either. I've seen a few of these alternators that need slight maching to fit, but most bolt right in. I've got one in mine and it works well. Can we get the "frame number" or part # for the one that fit? |
stugray |
Oct 21 2014, 08:33 AM
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#13
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Here is the math for it: A 12V heater at 40amps is generating 480 watts. 480 Watts converts to 1638 BTU. The dryer you list above, at 22,000 BTU is pulling 6447 Watts. That works out to 27 amps at 240 Volts. I saw the numbers posted above and was dubious. "That works out to 27 amps at 240 Volts." I dont think that my wife goes out to the garage to plug her hair dryer into my welding outlet (or the clothes dryer). In the US, the most a hair dryer can pull is 15 Amps @ 110V for 1650Watts. Most of them are 1200 watts. Even most electric floor heaters will not pull more than that. |
Rob-O |
Oct 21 2014, 08:49 AM
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#14
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Senior Member Group: Members Posts: 1,251 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region |
100 amp GM one wire alternators fit in there like a glove. No more voltage regulator on the board either. I've seen a few of these alternators that need slight maching to fit, but most bolt right in. I've got one in mine and it works well. Can we get the "frame number" or part # for the one that fit? I'll see if I can snap a picture (and get frame/model number info) next time I'm under there. |
Dtjaden |
Oct 21 2014, 09:06 AM
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#15
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Member Group: Members Posts: 232 Joined: 25-May 13 From: Morgan Hill, CA Member No.: 15,915 Region Association: Northern California |
Definately snake oil! As stugray stated above 480 watts is the equivelant of 1638 btu's, not 8000. You can't get more power (heat) out than you put in.
To generate 8000 btu's from 12 volts you would need to draw 195 amps. |
Mark Henry |
Oct 21 2014, 09:12 AM
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#16
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
A 40amp draw is huge and 8000 BTU is not much when heating a cold car. We're talking clothes dryer draw (in amps) and the average dryer puts out 22,000+BTU Yea, but the clothes dryer is running a 240V. The car is only running 12V. There is a big difference in the available power between 240V and 12V. A 12V car battery will only get a dryer's heater elements slightly warm. Here is the math for it: A 12V heater at 40amps is generating 480 watts. 480 Watts converts to 1638 BTU. The dryer you list above, at 22,000 BTU is pulling 6447 Watts. That works out to 27 amps at 240 Volts. ===================== The ignition system on a 914 will only draw a few amps. It is when you start running lights and wipers to deal with the rain/snow/night that you will exceed the output of the alternator. Yeh I'm no electrical engineer... my point was that 8000 BTU in a car is not much. The Subaru why would you do an electric heater? Even at 100amp alt the electric heater would still be wimpy. |
Cap'n Krusty |
Oct 21 2014, 09:22 AM
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#17
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Here is the math for it: A 12V heater at 40amps is generating 480 watts. 480 Watts converts to 1638 BTU. The dryer you list above, at 22,000 BTU is pulling 6447 Watts. That works out to 27 amps at 240 Volts. I saw the numbers posted above and was dubious. "That works out to 27 amps at 240 Volts." I dont think that my wife goes out to the garage to plug her hair dryer into my welding outlet (or the clothes dryer). In the US, the most a hair dryer can pull is 15 Amps @ 110V for 1650Watts. Most of them are 1200 watts. Even most electric floor heaters will not pull more than that. Uhhhh, your wife drys her hair in a clothes dryer? Nothing in the post referred to a hair dryer. The Cap'n |
SirAndy |
Oct 21 2014, 10:08 AM
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#18
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Resident German Group: Admin Posts: 41,605 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Electric heaters in cars do *not* work. They just don't.
Get a gasoline heater and be done with it. http://www.914world.com/bbs2/index.php?showtopic=113152 (IMG:style_emoticons/default/shades.gif) |
stugray |
Oct 21 2014, 10:26 AM
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#19
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Just put jwalters self-sustaining wind turbine in one of the headlight buckets and you can generate enough power to run a clothes dryer...
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Dr Evil |
Oct 22 2014, 08:31 PM
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#20
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Send me your transmission! Group: Members Posts: 22,993 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
I have a BN4 gas heater that I will sell you (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/idea.gif)
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