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70 Posts
Discussion Starter #1
Hi,
=

I drove my E-Porsche in today after coming back from Myrtle Beach and it wa=
s 30F this morning. The ceramic heater I put in the air plenum works to in=
crease 20F over the incoming air *but* the intake is fixed from the outside=
air not recurculate inside the cab like my E-Jeep or Cushman or Electro-Me=
tro was. I don't see how to modify it eather. I thought of adding a long =
skinny radiant heater like an element I saw at northern Tool. Does someone=
know of a tiny under dash heater i could use in the E-Porsche?
=

Have a renewable energy day,
Mark in Roanoke, VA
_________________________________________________________________
Help yourself to FREE treats served up daily at the Messenger Caf=E9. Stop =
by today.
http://www.cafemessenger.com/info/info_sweetstuff2.html?ocid=3DTXT_TAGLM_Oc=
tWLtagline
_______________________________________________
For subscription options, see
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70 Posts
Discussion Starter #2
Hello Mark,

I am using a under dash heaters that I got from a independent auto parts =

store. These are known as cab heaters which hang from a bracket under the =

dash. I have two of them, one for the driver side and one for the passenge=
r =

side.

These units are only 2 to 3 inches high and mine is way back about 1 inch =

from the fire wall, so the circulated air can go into the rear of the =

heater. I use a on dash 30 amp rated switches to select which heater I wan=
t =

on.

When I was at the auto parts store, I also look through the engine water =

heaters which are made for large semi truck tractors. These are 2.5 inch =

diameter by 16 to 20 inches long rated either at 120 to 240 volts at =

different wattage. I using a 120 VAC at 1000 watt unit with a 120 vac bras=
s =

circulating heating pump that is connected to the existing hot water heater =

core.

I am using a 3 inch copper pipe with 3 inch caps solder on both ends and ha=
d =

a radiator shop solder a radiator fill cap and two pipe stubs on it that on=
e =

is connected to the pump and the other is connected to the heater core. =

This tank which is insulated with heavy foam insulation sets in the same =

position that the top tank of a radiator would set.

All the heater lines that run to the heater core, heater, pumps and tanks =

are double insulated with that good black Air Conditional foam pipe =

insulation, so as to retain the heat.

As for the cold air that is comes in which is use to temper the hot water o=
f =

a engine, I had to take my ductwork all apart and re work it so the out sid=
e =

air is block with a damper door that can close all the way and now can =

circulated the inside cab air. I find that I only need about 50 degree =

water temperature to defrost the windshields at any temperature down to 0 =

degrees.

You note, that all my heaters, pumps, and fans are rated at 120 VAC 60 hz. =

I use a on board inverter that is rated at 120 VAC 60 hz 5 Kw that I can =

select with a on dash selector switch or commercial power while the EV is =

plug in. My inverter can either run off a large 12 volt deep cycle battery =

which is also back up with a inverter-alternator which are the large semi =

truck type that can also charge the battery at voltages up to 15 volts and =

provide 110 VDC at 7 KW.

I can preheat any of these heaters with commercial power, about 15 minutes =

before I leave to 80 degrees F or more. This is enough heating for driving =

about 2 miles, let the EV set for about a hour and still have enough hot =

water heat in the tank to defrost the windshield. I may only turn on the =

driver side 640 watt heater for about a minute while driving about a mile a=
t =

0 degrees F.

Roland


----- Original Message ----- =

From: "Mark Hanson" <[email protected]>
To: <[email protected]>
Sent: Tuesday, October 30, 2007 7:06 AM
Subject: [EVDL] Tiny Heater



Hi,

I drove my E-Porsche in today after coming back from Myrtle Beach and it wa=
s =

30F this morning. The ceramic heater I put in the air plenum works to =

increase 20F over the incoming air *but* the intake is fixed from the =

outside air not recurculate inside the cab like my E-Jeep or Cushman or =

Electro-Metro was. I don't see how to modify it eather. I thought of =

adding a long skinny radiant heater like an element I saw at northern Tool. =

Does someone know of a tiny under dash heater i could use in the E-Porsche?

Have a renewable energy day,
Mark in Roanoke, VA
_________________________________________________________________
Help yourself to FREE treats served up daily at the Messenger Caf=E9. Stop =
by =

today.
http://www.cafemessenger.com/info/info_sweetstuff2.html?ocid=3DTXT_TAGLM_Oc=
tWLtagline
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev =


_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

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70 Posts
Discussion Starter #4
Are they something like these heaters? :

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94592

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=96144

Not sure if these would put out enough heat, even here
in the South.


--- Deanne Mott <[email protected]> wrote:

> Hi Roland,
>
> I'm hoping you can elaborate on your small under the
> dash heaters?
> I'm wondering what's the brand and model, and also
> how you hooked them
> up (electrically and mechanically.)
>
> I was about to buy one of the $600 water type EV
> heaters, but today
> (at 35F outside) I noticed that pretty much only my
> feet and legs get
> cold on my half hour drive to work. If its really
> cold I have a 12V
> heated blanket but that makes it awkward to drive,
> and my feet still
> are cold. Maybe all I need here in NC is one of
> these little guys
> under the dash at my feet.
>
> thanks very much - De
>
> On 10/30/07, Roland Wiench <[email protected]> wrote:
>
> > I am using a under dash heaters that I got from a
> independent auto parts
> > store. These are known as cab heaters which hang
> from a bracket under the
> > dash. I have two of them, one for the driver side
> and one for the passenger
> > side.
> >
> > These units are only 2 to 3 inches high and mine
> is way back about 1 inch
> > from the fire wall, so the circulated air can go
> into the rear of the
> > heater. I use a on dash 30 amp rated switches to
> select which heater I want
> > on.
> >
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>


_______________________________________________
For subscription options, see
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Registered
Joined
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70 Posts
Discussion Starter #7
No, The underdash heater units I am using are metal case and hard wire in.
They require 640 watts at 5.33 amps at 120 volts or 53.3 amps at 12 volts
through a inverter. You need a heavy depth cycle battery and a alternator
to run these units.

The larger one shown may work which is about 12v x 13a = about 156 watts.
It may work, if you preheat with a 12 volt battery charge on for about 60
minutes before you leave.

Roland


----- Original Message -----
From: "M. Barkley" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Tuesday, October 30, 2007 11:48 AM
Subject: Re: [EVDL] Tiny Heater


> Are they something like these heaters? :
>
> http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94592
>
> http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=96144
>
> Not sure if these would put out enough heat, even here
> in the South.
>
>
> --- Deanne Mott <[email protected]> wrote:
>
> > Hi Roland,
> >
> > I'm hoping you can elaborate on your small under the
> > dash heaters?
> > I'm wondering what's the brand and model, and also
> > how you hooked them
> > up (electrically and mechanically.)
> >
> > I was about to buy one of the $600 water type EV
> > heaters, but today
> > (at 35F outside) I noticed that pretty much only my
> > feet and legs get
> > cold on my half hour drive to work. If its really
> > cold I have a 12V
> > heated blanket but that makes it awkward to drive,
> > and my feet still
> > are cold. Maybe all I need here in NC is one of
> > these little guys
> > under the dash at my feet.
> >
> > thanks very much - De
> >
> > On 10/30/07, Roland Wiench <[email protected]> wrote:
> >
> > > I am using a under dash heaters that I got from a
> > independent auto parts
> > > store. These are known as cab heaters which hang
> > from a bracket under the
> > > dash. I have two of them, one for the driver side
> > and one for the passenger
> > > side.
> > >
> > > These units are only 2 to 3 inches high and mine
> > is way back about 1 inch
> > > from the fire wall, so the circulated air can go
> > into the rear of the
> > > heater. I use a on dash 30 amp rated switches to
> > select which heater I want
> > > on.
> > >
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 
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