Re: (ET) Buck/boost for E20 charger....

["RJ Kanary" <rjkanary nauticom net>]

     It has been done . Proceed with caution, and meter everything that's 
going on. Output voltage, current , and line draw . Keep an eye on diode and 
transformer temperature with an infrared thermometer. Small changes in the 
capacitor's value can result in dramatic changes elsewhere.

----- Original Message ----- 
From: "Christopher Zach" <czach computer org>
To: "Elec-trak list" <elec-trak cosmos phy tufts edu>
Sent: Sunday, June 12, 2005 11:06 PM
Subject: (ET) Buck/boost for E20 charger....


> Ok, this is going to be interesting.
>
> So I came into possession of approximately 300 SAFT NiCD cells. Each cell 
> is a BB600 form factor, and puts out 30-40ah at 1.2 volts. Flooded cells.
>
> That's the cool news. What I want to do is put these puppies into my E20 
> and get rid of the T105's. I think I can replace a T105 with 15 of these 
> cells (5 cells wide=6 volts, 3 ranks deep=110ah) and get a tractor that 
> will run full power in the summer, winter, etc for about 20 years per 
> pack.
>
> Problem is charging them. The E20's charger ramps up to 45 volts IIRC, is 
> it possible to change the cap value and boost the voltage a bit higher? 
> NiCDs like around 1.6vpc, or 8 volts per 6 volt battery or 48 volts 
> nominal. Add 2 volts to that for the battery control circuit I use (the TI 
> DQ series) and I would need the Elec-trak transformer to put out a max of 
> 50 volts.
>
> SO any thoughts on getting that ferro-resonant transformer to have a 
> slightly higher secondary without rewinding it?
>
> Chris
>
>
>
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