Re: What kind of Hair Dryer for DC Defrost/Heat..

[Rod Hower <rodhower@ameritech.net>]

A sweeper motor has universal AC.  That is it can run
fine on DC as well, 180VDC or less.  Rig one of these up
with a ceramic heater to get air flowing real fast.
The TEVan has a bunch of PTC resistors AKA close to ceramic
heaters with a strong blower.


John Wayland wrote:
> Hello to All,
> 
> evblazer@softhome.net wrote:
> 
> 
>>It is getting cold up in CT and my wife wants heat.. When I got the blazer
>>it was missing everything under the hood for the ac/heater including the
>>blower motor and vents. ...
>>I recall reading of people using Hair Dryers and was wondering what kind you
>>could use?
> 
> 
> Using a hair dryer works, but it's pretty noisy and crude. If you want a cheap but still
> effective heater, why not use a ceramic element or two? I found a ceramic type heater at
> Home Depot for just $9 and some change, so you could get two of them for under $20! You
> could disconnect the wires from the AC fan motors, and separately wire them to a $49
> 12VDC-120VAC inverter, and have 3kw of instant, very quiet heat. This is enough heat to
> roast you out of the cab and make you switch one of them off and just run one once the cab
> is warmed up. You could also remove the $9 heater's AC fan motors and get a few surplus
> type 12V BDC fans for about $5 each.
> 
> Of course, the best way, is to get to a wrecking yard and find the stock factory blower
> and duct work, then install the twin ceramic elements where the original heater core was,
> so you could have full control over dash vent, defroster vent, or floor vent heated air.
> 
> If this doesn't sound right for you and you still want to go the hair dryer route, you'll
> need to pick one that has a brushed PM type motor. These are usually the noisiest, as the
> tiny motor spins really high RPM. You can tell which hair dryer has this kind of motor,
> because you can look into it and see the small diodes that make DC for the motor, and
> these of course, will simply pass your EV's battery juice through to the motor. Some of
> the more expensive and usually quieter hairdryers have true AC motors to run the fan, and
> you'll want to avoid this type for the 'quick and cheap' duty as the heater for use in the
> EV.
> 
> See Ya.....John Wayland
> 
>