PV Gap

Gail Said:

Is there a switch created that can switch power from one of two 6v batterys to provide constent power?

We Answered:

The YUKS, is correct about the ASCO automatic transfer switch. They are industrial grade a High $$$$ item.
If you want to transfer the power manually, you only need a DPDT (double pole, double throw) switch rated for the current that your camera uses. You can get these at a Radio shack or an electronics or electrical parts store. wire the switches center poles to the camera and the outside or end poles to the batteries.
Switch to the right for battery A, Switch to the left for Battery B.
If you want they have switches with a center position "OFF" might come in handy for maintenance

Food for thought.

Craig Said:

Where can I get a 300 amp sun charger?

We Answered:

amps depends on the storage voltage and your peak usage

25000w/24= about 1 kw hour.


1kw at 120 volts is 8 amps no where close to 300 amps :) Trust me when i say you dont need 300 amps. 300 amps would need a wire the size of your finger.

Of course 8 amps wouldnt be right because sometime in the day you would have a large peak. Maybe you will turn on all your tv's and computer just fun i dont know. You will have to calculate your peak by counting everything you would ever use at one time. My guess is 60amps would be more than you would ever need.

60amps x120v(battery) is 7200 watts or 7 times your average.
or
60x48v(battery) is 2880 watts little less than 3 times your average.

The storage voltage would depend on the inverter. The better the inverter in most cases the higher the max input voltage.


Large systems do not store voltage at 12 volts. Maybe thats is why it gave you a 300amp ratin.g

Solar panels are about $3 dollars a watt


25kw needed in a day.
10 hours of charging light
25kw/10hour=2.5kw needed a hour.
2500x$3=$7500

7500 for the panels
3000 for the inverter
2000 for the battery (maybe 1k depending)
1000 for the "wiring and other"

If you do it your self.
My power is 8 cents a kw
13500/0.08=168750 hours or 7031 days or 19 years payback not counting repair costs and interest income that would have been lost.
The only way this would be worth doing is if you can get the tax payers to pay for some of it or if you're in a remote area.

If you find deals you could cut this cost by 25%. I didnt price in the cost of installing the system if you are not able to do it.