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How many KwH or volts would this equal?
I have a .04% model house that needs .94 kwh. I'm using a digital multi-meter to track how much the photovoltaic solar panels get, but the multimeter reads out in volts or amps.
Soo my question is, how many volts OR amps, or hopefully both, does .94 kilowatts per hour equal? Please help, I really need it for my science project.
Thanks in advance =]
IF you want to measure Watts with your simple system, you need 2 meters. One to measure Volts, and one to measure Amps. Like those guys above said, multiply Volts * Amps to get Watts.
If you only have one meter, then you can do this:
For your photovoltaic panel; in full sunlight it has an output voltage rating. You need to look that up, or measure it directly while it is powering up the model home. That voltage, whatever it is (i.e. 12 V, 24V, etc.), will remain fairly constant in full sunlight, while it is supplying current to the home. You can use that value and monitor ONLY the current (then you don't need 2 meters) to get the power in Watts.
When a judge asks you about power readings from only one amp-meter, you can explain to him that you are assuming the voltage from the solar panel is whatever voltage you measured or looked up. You can also explain that this is a source of error in the calculation due to clouds in the sky, the angle of the sun in the sky, dust on the solar panel, etc. Because when any of those things happen, the voltage will drop.
If you have 2 meters you can get an accurate power level no matter what happens in the sky
In order to read Energy, you need to take Watt readings over time. Energy = Watts * time (hence kiloWatt-hours which is kiloWatts multiplied by hours, or Joules, which is Watts * seconds). There is no simple way to read energy directly other than with an energy meter (the kind that is attached to your (real full size) home. You can also get volt and amp meters that interface to a PC and take constant samples of the readings. A program in the PC can be used to integrate the power readings over time, and display energy used over time.
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