Date: Sun, 25 Apr 2010 09:37:11 -0700
Reply-To: Tobias Gogolin <usertogo@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Tobias Gogolin <usertogo@GMAIL.COM>
Subject: Re: PWM controller ,
was Water Cooler System Design Flaw Workaround?
In-Reply-To: <4BD45D0B.6090405@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
If somebody wanted to do it they could use the FET's you find on old
computer motherboards, they are usually 30V 40-60A...
And that is one interesting reason to do it 30 to 40 amps more or less from
the batteries at a time is almost all of the capacity, of the alternator
etc.
So it would be more reasonable to use only as much as required 40-100 %
instead of just on/off...
However who has time to pioneer that type of circuit?
Better to still be one of the first to convert a Vanagon to electric drive
:)
On Sun, Apr 25, 2010 at 8:17 AM, Mike "Rocket J Squirrel" <
camping.elliott@gmail.com> wrote:
> Alistair Bell wrote:
>
>> my rad fan is 450 W if that helps
>>
>> alistair
>>
>> PS i dont see the point in a pwm controlled fan, I would concentrate
>> in a more sophisticated temperature interpretation, ie a PID
>> controller... monitor rate of temp change to that fan can keep on top
>> of things...
>>
>> but you know, my experience of the fans in real life is that they
>> come on, cool the van down and go off.... seem to work fine :)
>>
>
> I'm with the Bell on this one. The radiator on the fan is capable of
> creating lots of cool water, and the thermostat opens and closes as
> needed to draw from that reservoir. If the engine was seeing huge over
> and undershoots in temperature then a better control system would be
> warranted. But the large thermal mass of the engine pretty much assures
> that temp changes will occur pretty slowly, and the thermostat seems
> capable of keeping up with them.
>
> I guess I don't see a problem that needs solving. But I do enjoy fancy
> engineering for engineering's sake, too.
>
>
> --
> Mike "Rocket J Squirrel" Elliott
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.)
> Bend, OR
> KG6RCR
>
--
Tobias Gogolin
Tel. Movistar (646) 124 32 82
Tel. Telcel (646) 160 58 99
skype: moontogo
messenger: usertogo@hotmail.com
Blog: http://zeitgeistensenada.blogspot.com/
You develop Sustainable Ranch Technology at
http://tech.groups.yahoo.com/group/SURA-TECH
an Open Source Electric Motor/Alternator at
http://groups.yahoo.com/group/Performance_Axial_Flux
and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox
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