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Science Forum Index » Electronics - Misc Forum » 12V to 72V invertor for battery charging
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| N_Cook |
 Posted: Thu May 01, 2008 2:14 pm |
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Scenario 12V,20A wind generator to charge a bank of 6x 12V batteries to run
a 72V motor.
What would happen if you ran a 12V to 110V sine or quasi-sine invertor ,
through a high power rectifier to the bank of 72V batteries ?
What other considerations , protections etc , should it work ? |
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| Don Bruder |
| Posted: Thu May 01, 2008 4:41 pm |
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In article <fvd4qh$fpp$1@registered.motzarella.org>,
"N_Cook" <diverse@tcp.co.uk> wrote:
Quote: Scenario 12V,20A wind generator to charge a bank of 6x 12V batteries to run
a 72V motor.
What would happen if you ran a 12V to 110V sine or quasi-sine invertor ,
through a high power rectifier to the bank of 72V batteries ?
Lots of wasted juice due to the inverter/rectifier intermediate step,
and "a couple batteries' worth" over voltage. Never mind the cost that's
likely to be involved in a 20 amp rectifier.
Obviously the batteries are currently sitting in series to give the 72
volts needed to run the motor. I can't see any reason not wire them so
that by changing a switch, they're either series for running the motor,
or parallel for charging. Once you've got 'em "stacked" in parallel,
whether by way of a switch, or by rewiring them, just hook the genny up
to them and keep an eye on the charge-state. You might want a
current-limiting resistor in the mix, but I suspect that you could run
without one, and of course, that's going to extend charge time.
Quote: What other considerations , protections etc , should it work ?
It *SHOULD* work, if the charge-state is carefully monitored, but if you
"slip", you may cook off or blow up one or more cells.
--
Don Bruder - dakidd@sonic.net - If your "From:" address isn't on my whitelist,
or the subject of the message doesn't contain the exact text "PopperAndShadow"
somewhere, any message sent to this address will go in the garbage without my
ever knowing it arrived. Sorry... <http://www.sonic.net/~dakidd> for more info |
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| Paul E. Schoen |
| Posted: Fri May 02, 2008 12:18 am |
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"N_Cook" <diverse@tcp.co.uk> wrote in message
news:fvd4qh$fpp$1@registered.motzarella.org...
Quote: Scenario 12V,20A wind generator to charge a bank of 6x 12V batteries to
run
a 72V motor.
What would happen if you ran a 12V to 110V sine or quasi-sine invertor ,
through a high power rectifier to the bank of 72V batteries ?
What other considerations , protections etc , should it work ?
You should be able to build six isolated DC-DC converters with a wide input
range to accommodate the voltage variations of the generator, and also
individually provide the optimum charge for each battery. Such a charger
(about 25 watts) can be made using a PIC or one of many battery charger
ICs, and you could add a visual "state of charge" LED indicator to each
battery to detect problems.
Paul |
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