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Author Topic: Safe Battery Charging  (Read 1709 times)

hyjacked

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Safe Battery Charging
« on: September 30, 2003, 12:20:13 PM »

Hey all,

I was talking about in the following thread:
http://forums.gideontech.com/viewtopic.php?t=19158
I'm going to be putting ccfls in the bottom of my keyboard. I'm going to find a slim 12v battery as is used in rc cars(or make my own) to power the inverter. It will also have a switch so that it can be shut off.

Now as for recharging the battery, rather than taking it out, I'm thinking of putting a connector in so I can just hook up the charger when it has to be hooked up. I've been having some trouble finding a small cheap 12v charger when I came across a 12v solar car battery charger.
Link here
has the connector and has a cool factor to it to. :D

Now for my question, how would I hook this up to the batter so it:
1) works
2) won't over charge the battery
3) won't send power from the batter to the solar cell when not enough light is present.
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daPyr0x

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Safe Battery Charging
« Reply #1 on: September 30, 2003, 04:21:13 PM »

my personal opinion would be to buy (or use one you already have) a smart charger.

just pull the circuitry and wire the solar charging cell as vcc...
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viridius

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Safe Battery Charging
« Reply #2 on: September 30, 2003, 05:34:16 PM »

I'd put a switch in to change it from "charge" to "run".  Those solar cells aren't really designed to charge up a battery from empty though, so you might want to spring for a wall powered charger.  A diode put in forward bias will keep the battery from discharging through the solar cell.
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hyjacked

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Safe Battery Charging
« Reply #3 on: September 30, 2003, 07:48:56 PM »

Quote from: daPyr0x
my personal opinion would be to buy (or use one you already have) a smart charger.

just pull the circuitry and wire the solar charging cell as vcc...


most chargers go from ac to dc to charge, I want dc to dc, thus I'd rather not buy something where I'd have to sort through that much circuitry and try to figure out what to keep.

Quote from: viridius
I'd put a switch in to change it from "charge" to "run".  Those solar cells aren't really designed to charge up a battery from empty though, so you might want to spring for a wall powered charger.  A diode put in forward bias will keep the battery from discharging through the solar cell.


as far as the switch for charge to run, I'm going to plug in/unplug the solar cell, since I have a wireless keyboard I'd rather not have anything attached to it if it doesn't have to be.

yea I had figured about the diode, just wasn't sure where it should go, as long as it's in the solar to battery circuit and facing the right way it should be fine?
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viridius

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Safe Battery Charging
« Reply #4 on: September 30, 2003, 08:09:02 PM »

The diode can go anywhere between the solar cell and the battery.  I trust you will not attempt to run the CCFLs while charging the battery?
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hyjacked

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Safe Battery Charging
« Reply #5 on: September 30, 2003, 08:15:49 PM »

Quote from: viridius
The diode can go anywhere between the solar cell and the battery.  I trust you will not attempt to run the CCFLs while charging the battery?
Probably not, but what difference would it make? wouldn't it just charge the batteries slower? or slow the pace at which the batteries are drained depending on the difference between the draw from the ccfl and the charge of the solar cells?


question:
solar cell positive to battery positive? as in car battery boosting, or positive to neg?
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viridius

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Safe Battery Charging
« Reply #6 on: September 30, 2003, 08:28:38 PM »

Solar cell positive to battery positive.  I guess you could try using the CCFLs while charging, but if the power consumption is more than 5 watts, I doubt the battery will charge.  Have you considered the length of time it will take your batteries to charge and the amount of light the solar cell will receive?
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hyjacked

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Safe Battery Charging
« Reply #7 on: September 30, 2003, 08:50:15 PM »

haven't figured out how long it would take to charge, but as far as the amount of light goes, for the better part of the day the solar panel could be placed in direct sunlight, since the window near my computer is on the sunny side of my appartment.

if
http://www.vibecomputers.com/index.cfm?loc=iview&if=n&vID=190326&pnav=2
is my ccfl, how many watts would you think it would use?

[edit]
alright, dug up some more info on the solar panel
1.8 Watts / 12 Volts
125 mAmp / hr

Not sure what to do with the watts, but if my batteries are 12v/1000mah, then it should take 8 hours for a full charge right?
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