Hello Dennis,
I have my DC-DC converters disconnected from the main battery pack by use of
the ignition key, that controls two small mini contactors that I got from
evparts.com. I do not like to have any standing voltage in my EV. There is
too much main battery bleed off, no matter how much you clean the battery
and the motor brush dust when every thing is connected to it all the time.
My main battery pack is also disconnected from the controller and main
contactor and also from the battery charger when the ignition key is off.
Only the 12 volt accessory battery provides power to a isolation module that
keeps the E-meter on and to the ignition circuits.
I am using IOTA DC-DC converters, and I found that the problem, is that I
need it adjusted to 14.5 VDC instead of 13.5 VDC, which overcharges the
battery at that rate and boils the water out. So I install a small on board
12 volt battery maintainer or a smart charger will work, that is tap and
circuit breaker to the main input plug.
When I start up the EV and all its 12 volt accessories which can reach about
80 amps or more, it can pull down four IOTA's that are in parallel by about
2 volts.
To reduce this load on the DC-DC converters, I then transfer the DC-DC
converters off the battery and eight 12 volt motors to a alternator, while
the converter provide power the the rest of the 12 volt system.
Roland
Roland
----- Original Message -----
From: "Pestka, Dennis J" <
[email protected]>
To: <
[email protected]>
Sent: Friday, September 07, 2007 8:16 AM
Subject: [EVDL] Power to the DC/DC
> The schematic I have shows power to the DC/DC and accessory battery on
> all the time.
> I would like to wire it so it is only powered when the key is on.
> Good idea, bad idea ?
>
> Thanks;
> Dennis
>
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