Todd chargers in 24 VDC systems [RE-wrenches]

[Steve Willey - Backwoods Solar Electric]

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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