Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

Matt, You're right, it is 4.5% different. I'm not sure which buttons on the calculator I used to get 1.1%. Kent Osterberg m...@solar-energy-solutions.com wrote: Kent, Can you help me understand the 1.1%? I had figured over 4% and allowed that 1-2% may be voltage drop (though it is qui

Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

Kent, Can you help me understand the 1.1%? I had figured over 4% and allowed that 1-2% may be voltage drop (though it is quite literally 12' of 10 awg between the last enphase and the meter). In a state with a semi-active SREC market all our systems are installed with a revenue grade meter. I s

Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

Matt, The Enphase and revenue grade meter are in disagreement by less than 1.1% in the system you are describing - that's good agreement! According to the Enphase white paper, the wiring loss in the Enphase cabling between the first and 9th inverter is 0.6%. That only applies to the last inve

Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

I would always expect the power monitoring at the inverter ( or in this case at the module) to be higher, because of wire losses. Matt's case is about a 4 to 5% difference though, so that only explains maybe half the loss at most. I wonder if the inverter monitoring measures incoming watts, or

Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

ct: Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data First, I'd suggest swapping the inverter under the suspect module with it's neighboring module's inverter. See if the reduced output follows the module, or the inverter. If it follows the module, then I'd

Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

Good point, Matt. We've been required to install a revenue-grade solar production KWH meter in Oregon with every system. In 6-7 years with different inverter manus, I've never seen an inverter KWH display that wasn't, shall we say... exuberant, in relation to the revenue grade meter. Bob-O On

Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

First, I'd suggest swapping the inverter under the suspect module with it's neighboring module's inverter. See if the reduced output follows the module, or the inverter. If it follows the module, then I'd have a frank talk with the module manufacturer, backed with the data you've gathered, to see

Re: [RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

Mark, We have nine Trina modules on our roof with Enphase. Enphase says the array has produced 2,680 kWh to date. The revenue grade meter 12 feet away says 2,564. Until I hear otherwise I am reluctant to consider Enphase reporting precise. It seems to be similar to what I would expect from a s

[RE-wrenches] Warranty Claim Based On Enphase Monitoring Data

Folks, Has anyone used Enphase monitoring data to get warranty replacement on new modules with sub par yield? I have several interesting questions stemming from access to Enphase module level monitoring data. Looking at data from a larger site (80 modules) with no shading issues, instant power p