Todd chargers in 24 VDC systems [RE-wrenches]

[Richard Perez, Home Power magazine]

<x-flowed>Hello Steve

Thanks, we'll give it a try.

Richard

>Richard, I have been able to series Todd chargers (older type) without that
>trouble. But depending on the generator waveform, they can be lower.  If all
>else is equal between your testing at 12 and in series  24 volt, then I
>suggest tying the center tap between the two chargers to the center tap of
>the battery.  That way each one is tied to a 12 volt battery and should
>perform the same. In fact, that way one of the Todds is exactly the same as
>when charging a 12 volt battery, the other is too except that its negative
>is +12 volts respect to the chassis AC ground wire. So it would not seem
>that the neg ground voltage level is affecting the performance.  I suspect a
>different input or output operating voltage in the 24 volt set-up.
>
>Steve Willey   www.backwoodssolar.com
>Backwoods Solar Electric Systems
>----- Original Message -----
>From: Richard Perez, Home Power magazine <richard.perez at homepower.com>
>To: RE Wrenches <RE-wrenches at topica.com>
>Sent: Friday, February 11, 2000 12:34 PM
>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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------------------------------------
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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for info contact: <michael.welch at homepower.com>

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