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Re: Curtis controller voltage questions [was Re: Re: Could higher pack voltage be st

Markus Lorch wrote:
> I have a 1221R rated at 84V, 375A... I currently run my Curtis with
> 90V nominal and am wondering if I can take it any higher...
> could I do a 120V or 144V pack without having to replace parts?
> Or is there a fair chance that something will break?

84v is an unusual nominal voltage; was your controller specially built
for some OEM that wanted this voltage?

In general, the Curtis controllers are mass-produced commodity items.
They have been tweaked and cost-reduced to have just barely enough
safety margin to get by. I would be very reluctant to use one above its
ratings. They are fragile enough as it is! Your -R controller is going
to be particularly difficult to repair if it breaks.

> I suspect I have to open it and adjust some pots, like over voltage?

No, there are no pots for this. There is only one extra pot on the -R
Curtis, and I think it controls max regen current. The pots are all
accessible without opening the case, by removing the screws on the sides
of the case.

Ring the bells that still can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in -- Leonard Cohen
Lee A. Hart, 814 8th Ave N, Sartell MN 56377,
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