Todd chargers in 24 VDC systems [RE-wrenches]

[Bob Ellison]

Richard,
How about wiring them as 2 separate 12 volt packs as far as the chargers are
concerned? The pack  will not be balanced as it is charging but it might
work.
Major negative to positive @ 12 volts then from the next negative to the
major positive (where you get your 24 volt + output from), I think each
charger would only see 12 volts. Then you can use the equalizing charges to
keep everything balanced. I think this will work, but I haven't had the time
to check it out yet.

I have been thinking about this a bit as I will be making some system
changes to 24 volt in the future and it would be nice to be able to use the
charging capacity that I have now. It's hard to beat 260 Ah of charging
capability when you have to start the generator!

You're the fellow I speak to about batteries so I am a little nervous about
suggesting this......

See you in Madison WI.,
Bob Ellison

RE. Ellison
Alternative Energy Systems & Supplies
34642 Countryman Road
Theresa, New York. USA.
                           13691-2076




-----Original Message-----
From:	Richard Perez, Home Power magazine
[mailto:richard.perez at homepower.com]
Sent:	Friday, February 11, 2000 3:34 PM
To:	RE Wrenches
Subject:	Todd chargers in 24 VDC systems [RE-wrenches]

Hello Wrenches

Anyone got any suggestions regarding hooking up two 12 Volt, 70 Amp
Todd chargers to a 24 Volt battery (20 @ L-16s).

We (Joe and I) wired the outputs of the Todds in series and then to
the battery connection in the power center. Heavy wire and short
runs. We set each Todd for half of the voltage we wanted to regulate
the battery at. We switched on the Todds (powered by Honda ES6500
generator) and current output was way lower than we expected.

By juggling the voltage limit controls on the Todds we were
eventually able to get current output of the Todds up to around 30
Amps at 29 VDC. The stronger Todd we set up around 15 VDC and the
weaker about 14 VDC.

Bottom line is we are getting about 60% of the wattage our of the
series connected Todds as we got when they were wired in parallel
into a 12 Volt battery.

Has anyone else run into this? Any fixes?

Richard
------------------------------------
Richard Perez
Home Power
PO Box 520, Ashland, OR 97520  USA
Tele: 530-475-3179
FAX: 530-475-0836
Subscriptions: 800-707-6585
mailto:richard.perez at homepower.com
Web: http://www.homepower.com

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