Re: Solar Panels - how many to charge three batteries
- From: "lgadbois" <lgadbois@xxxxxxxxxxxxx>
- Date: Tue, 18 Apr 2006 03:17:12 GMT
I doubt that you have a 45 amp solar panel. A twelve volt panel of this size
would be about 6 yards in area. It is probably a 45 watt panel at full
sunlight. A 45 watt panel will deliver about 3 amperes at full sunlight.
With this size panel it is capable of charging a 100 ah battery in 33 hours.
CCA ratings on batteries do not tell the storage capacity of the battery.
The number that is important is the ampere-hour rating. If you have a deep
cycle battery that is rated at 100 ah, that means it will deliver 10 amperes
for 10 hours when fully charged, or 2 amperes for 50 hours.
Ten amps at 12 volts = 120 watts. 12 volt to 120 vac inverters are not 100%
efficient. The result is that the inverter may take an additional 10% or
more to handle the 12 volt to 120 vac step-up. If you have a 1500 watt
inverter so you can run high powered appliances off your batteries, it takes
about 140 amperes to produce 1500 watts. If you run a high powered microwave
oven for 10 minutes (1/6 of an hour) you will consume about 25 ah of energy
from a battery. A 45 watt panel will take 8 hours or more of charging time
to replace the 25 ah that was consumed.
"Nate" <n1a2t3e4spamproofccnn@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:7gW0g.11859$4L1.7333@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have one 45 amp solar panel that will help add some charge to my
batteries, but since I added an extra cabin battery and then a seperate
battery for my inverter, it is not doing it's job properly.
The batteries are typical deep cycle 800 CCA Everstarts from Wally World.
It usually takes us three days to drain down the cabin batteries, so we
are not using too much power there. The inverter battery works well to
make a pot of coffee and keep it warm for a few hours while we wake up.
Then the next morning it will make a half pot before the alarm starts
buzzing.
It takes several hours of generator use to bring them all up to a full
charge. And I usualy don't camp with full hookups. I'd like to harness
the sun's power when posible.
I know there is some math that will answer my question. But could anyone
help me figure out how many panels I need to keep those three batteries up
to snuff? I'm thinking three 45 amp panels.
Thanks,
Nate
.
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