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Post by mediadogg on Oct 30, 2019 15:35:37 GMT
Seems to me if there was a fixed error, they could calibrate the meter to give the correct reading. During the day my voltage is contently going up and down because of it charging. Have you checked your readings at night to see how far they are off? Not sure if you were asking me, or asking in general, but for me - I never worried about it. I use cable sizes and lengths that make sense, make sure my connections are tight and so long as the batteries get charged properly and the inverter runs my stuff, I don't sweat. Not much can be done about it I think.
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Post by tattoo on Oct 30, 2019 19:02:47 GMT
Not sure if you were asking me, or asking in general, but for me - I never worried about it. I use cable sizes and lengths that make sense, make sure my connections are tight and so long as the batteries get charged properly and the inverter runs my stuff, I don't sweat. Not much can be done about it I think. It was directed at you or who ever was interested, Yea like you I don't sweat it either but since it sounded like you were trying to help and understand it way more than I, I figured I'd make a suggestion.....
Have a good one...
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russ
Solar Advocate
Posts: 63
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Post by russ on Oct 31, 2019 2:42:40 GMT
Well, after taking a few measurements the difference isn't as much as I thought. I don't consider the differences to be significant and it has never concerned me.
Mediadogg: My thoughts exactly.
Here are my observations today:
Morning: 8:15AM
12.9 volts - Charge controller display.
12.80 volts - Charge controller battery terminals measured with Fluke meter.
12.74 volts - Battery terminals measured with Fluke meter.
4.21 amps from charge controller to battery.
Noon:
14.2 volts - Charge controller display.
14.08 volts - Charge controller battery terminals measured with Fluke meter.
13.88 volts - Battery terminals measured with Fluke meter.
9.6 amps from charge controller to battery.
After sunset:
12.8 volts - Charge controller display.
12.61 volts - Charge controller battery terminals measured with Fluke meter.
12.72 volts - Battery terminals measured with Fluke meter.
0.0 amps from charge controller to battery.
1.25 amps drawn from charge controller load terminals.
4.4 amps (approximate) drawn directly from the battery.
The system consists of two 100 watt solar panels in series connected to a Rover 20 amp charge controller charging a 100 amp hour gel cell battery.
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Post by mediadogg on Nov 1, 2019 1:00:23 GMT
Nice. Simple, powerful and effective. Hey, are you and tattoo related?
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Post by tattoo on Nov 1, 2019 2:15:16 GMT
Nice. Simple, powerful and effective. Hey, are you and tattoo related? Brothers from different mothers? ? ? LOL
NNnnnnnaaaa but I like his style......
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