Subject:
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Solar Ni-Cad Charging
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 17 Apr 1996 01:45:51 GMT
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Original-From:
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Sean Cunningham <sean@alice.msiconsultingANTISPAM.com>
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Viewed:
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1793 times
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I would like my robot to carry a solar cell for battery recharging. I have
not been able to locate a reference for any gotcha's with this plan, so here
goes:
I quote from the assembly manual:
[start quote]
The power supply provides between 12 and 15 volts to the charge circuit of
R11 and the Handy Board's 9.6 volt battery. There will then be a voltage
drop of about 2 to 5 volts across R11, yielding a charge current between 40
and 100 mA (milliamps).
[...] the standard charge rate of the battery pack is 50 mA.
[end quote]
So, my solar cell would need to be able to provide between 12 and 15 volts
at between 40 and 100ma. I have been able to locate a solar cell that
produces (in full light)
Volts: 15 to 17.5V
Current 80ma to 100ma
Would this be suitable? I realize I would need some kind of diode in series
to prevent battery discharging in darkness, but what else would I need to
do? Where would I attach the leads from the solar cell?
Sean R. Cunningham
MSI Consulting Group
http://www.msiconsulting.com/
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Message has 1 Reply:
 | | Re: Solar Ni-Cad Charging
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| Attach leads to same place the charger goes. + to +, - to -. Don't forget the diode. To be safe, monitor the current when the batteries are fully charged. Should not be more than 50ma. It is a good idea to cycle the nicad's about once a month. That (...) (28 years ago, 17-Apr-96, to lugnet.robotics.handyboard)
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