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 =
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today.
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tWLtagline
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