Re: How to calculate a battery capacity
- From: chuck <nospam@xxxxxxxxxx>
- Date: Mon, 18 Sep 2006 15:36:28 -0400
Puckdropper wrote:
"Simon Dice" <bitxbit@xxxxxxxxxxx> wrote in news:1158603177.343083.179580
@i3g2000cwc.googlegroups.com:
I'm working on a project in wich I need to have a system running 24hrs
a day , power supply will be solar panels feeding a battery. Can any
one share with me formulas on how to calculate de Amp/hr for the
battery and the power of the solar panel?
Systems will consume average 80watts and need to keep running on a few
clowdy days as well.
Thanks for the assistance!
Watts = Amps * Voltage
The Amp/hr rating of the battery (I think) says that if the device draws x amount of amps, the charge will last this many hours.
This should get you started.
Puckdropper
The amp-hour rating is usually based on a fairly "low" rate of discharge. The greater the discharge rate, the lower the battery's capacity. Lead-acid batteries are often rated at a stated discharge rate. Do a search on "peukert" for more information on this relationship.
You should also be able to find some sites with information on designing solar charging systems.
Chuck
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