Re: 120 V AC to 120 DC Lawn Mower Conversion. CORDLESS !!

[russell239@juno.com]

A friend in Maynard used a battery pack consisting of 60 ~ 2 volt 5 AH
Gates GelCells and they lasted long enough to do a lawn in corner lot. 
So even though it is AC DC motor it doesnt draw much current at least
compared to 5AH batteries.
It is better than small Delphis doing mt S-10 comparebly speaking.
Good thing is that charging is relatively fast if one wants to.  5 Ampere
Hour pack and 120 vac to it through a FWB rectifier.  Maybe a current
limiting res and can do maybe 5 or so amperes and get a near full charge.
 I use a 15 watt AC lamp in series all night to charge.
Good way to get a feel for charge discharge charactoristics.

Russell

http://www.concentric.net/~russ239
120 volt S-10 Chevrolet,  132 volt E-16 GE, 36volt E-20 GE
jeGra research
D. Russell Graves
P.O. Box 261, Maynard, MA, 01754-0261

On Thu, 30 Mar 2000 21:02:35 -0800 "Steven S. Lough" <slough@halcyon.com>
writes:
> Now I know from practical (jump it and try it) that 120 DC will run a
> 120 AC brush> type lawn mower just fine...   The problem is getting  up
to or near 
> 120> DC with> small lead acid batteries.>  You look at the total volume
and weight of DC batteries in a DC 24 > volt> cordLESS> lawn mower, and
the thing will run on not TOO tall grass for 20 > minutes> or so.> Which
would be GREAT> > So couldnt a similar weight/size group of small 12v
batteries be> gathered together
> and do about the same ??  Or is there some OHMS Law thing at work 
> that> would NOT work. Or I havn't taken in to consideration ??
> > What I am trying to get to here, is a pile of small 12v batteries, 
> that> would be CLOSE> to the same SIZE and WEIGHT as the two small 12v
batteries, in a 24v > DC> cordless> lawn mower, except this would be
rinning a 120v  brush-type mower. > (of> course with> a suitable DC rated
  ON/OFF switch )  Ya dont make that error > except> ONCE.> > Now if
THESE assumptions are in line, wonder where some one could > get 10>
small> 12v batteries for less than $100.> 
> I guess what I should do is with a clamping ampmeter, measure the AC 
> and> then DC> draw on such a set-up and then get small 12v batteries to
compliment> THAT drain rate.> > Wha-Da-Ya-Think ??

Heck just try it and have fun.
I did and still do.
Even power a E-16 on toy gel cells too with a 132 volts.
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