On 2014-09-20 01:07, free cycle wrote:
I am designing a 36V ebike battery charger that can be powered from
an off-grid 48VDC solar array. I have a Spice simulation of the buck
converter stage working. It's conceptually simple, but the devil's in
the details and I am looking for advice on component selection.
Hooray for solar ebikes!
If they're strong enough, components are much of a muchness. Since
it's a lot of visual info and thought-process, you're probably best off
buttonholing someone at a Monday meeting.
HOWEVER:
If you want to use a 48V array on a 36V battery, you're actually best
off with no convertor at all, just overcharge protection.
Solar arrays are most effective at ~75% of their open-circuit voltage,
("peak power voltage" or Vpp, which in your case is ~36V in full sun)
while batteries charge at a bit over their nominal voltage.
Under typical Oregon conditions, you'll be getting much less than that.
If you want to do maximum power-point tracking (which is complicated
but nifty) a *boost* converter would actually be best for your
application, and would let you charge on cloudy days.
Regards,
Aaron
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