D.C. pumps and motors... [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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Jeff Yago said:
>...we stopped
>supplying exhaust fans furnished with DC motors. We were replacing brushes
>in DC powered exhaust fans in greenhouses two times a season.

That's typical of very small motors of poor quality  -- not GENERALLY 
true for DC motors. 10,000 hour brush life is not unusual if designed 
for it. The smaller the motor (less than 1/8 HP, especially), the 
harder it is to get one with long life.

Windy

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