The inverter will shows the highest number since that's where the energy produced. POCO meter is the one it actually count.
I have Locus monitoring + TED 5000 as well, but the report aren't that far off. Locus monitoring is compliance with ANSI 12.20 class revenue-grade power-meter. The actual reports are less than 2% off comparing with inverter's output (by looking at inverter's output LED screen). TED 5000 report are like about 5% off.
OP mention the solaredge inverter output at 53.38kWh, I'm not sure if he is looking at the output from inverter's LED screen or his solaredge monitoring software.
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What are you taking about? A difference of a few percent doesn't seem like a big deal, and the TED agrees well with the meter. I think that most of the kWh numbers he had reported have been from the TED, and although there is reason to think the inverters output might be slightly high, nothing that has been posted is inconsistent with what the system should be capable of. I don't think the numbers are any more or less meaningful than what you've posted on your own system.
Edit: since no one has really said it... given the history of this system, it wouldn't hurt to check for hot spots in the connections between the inverter and the meter, just in case some power is being lost. A fun use of that camera the op just bought.Leave a comment:
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I think it has to do with the accuracies of the meters. The SolarEdge is most likely (guessing, similar to my Enphase) +/-5% accurate and a revenue grade meter must meet the ANSI C12.1-2008 accuracy requirements of +/- 2%. The difference can be as much as 7%!Leave a comment:
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First, I would hope the inverter reading is higher than the POCO, because it is
pushing out current and the voltage is highest there. I lose 400W in my 600'
loop. The inverter reading should be the AC output; compare it to in/out
voltage X current.
I would not expect a clamp on ammeter to be as precise as a fixed, calibrated
commercial meter. I trust my old mechanical meter the most; hope the latest
electronic ones are as good.
And a TED5000 might not deal with power factor as well, though my tests
indicate its close.
I would not be terribly concerned with the variations listed; possibly some
improvement is possible. Listen to Sunking. Bruce RoeLeave a comment:
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Yes, I assume the POCO meter is correct. I do use the TED5000 number to correct PVOutput numbers. The spreadsheet I created using TED5000 number for PV production as well as consumption are entered in this spreadsheet. From TED5000, I calculate net production/usage. I then adjust the TED5000 numbers to match POCO numbers monthly. I then sum these monthly Net and PV production adjustments separately(some months are +, others are -). So far, the End of Year adjustment sums of net kWh used as well as the PV production compared to the POCO net meter and PV meter have been almost negligible. At the end of 2014, POCO PV production meter was about 1% less than TED5000 and POCO Net meter was 2% less than TED5000 readings.Leave a comment:
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Very first thing every electric student learns in his first day of lab his numbers are a bit off. That leads to the student asking the instructor what is going on and the instructor replies:
"Stupid we measure our 2 x 4 lumber with a micrometer, mark the spot with chalk, cut it with a broad ax, and make it fit with a sledge hammer"
The only correct reading and the one that counts is the POCO meter.
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Difference between inverter kWh output # and meter output #?
Is this pretty typical or something that needs to be looked into?
Now that I have an actual meter from the POCO, I can check it against my inverter and again the TED5000 (which has always shows a little less than the inverter). Well, the meter itself actually shows lower than the inverter as well.
SolarEdge Inverter: 53.38kWh
POCO Meter: 51kWh
TED5000: 51.5kWh
I thought maybe the inverter is showing DC kWh and not AC, but they are too close, if that was the case the difference between them would be bigger.
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