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My 11.2kW Tesla Solar Project - Portland, OR

pdx_m3s

Active Member
May 18, 2019
1,325
1,160
Portland, OR
Tesla was on-site today to fix my energy usage monitoring issues. The issue due to how the installers wired the Powerblaster to both 200 amp main panels.

The installers originally split the Powerblaster to pick up both 200-amp mains, however, that was incorrect. A Powerblaster can only pickup accurate usage from one main panel for a solar-only install, and there's no way to bring in usage data accurately with two 200 amp mains.

So long story short, I'll only get usage from one of my 200 amp mains. I'm surprised Tesla doesn't have a work-around for this. Having two 200 amp main panels can't be that rare, right?
 
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power.saver

Supporting Member
Mar 4, 2018
536
544
Arcadia, CA
Tesla was on-site today to fix my energy usage monitoring issues. The issue due to how the installers wired the Powerblaster to both 200 amp main panels.

The installers originally split the Powerblaster to pick up both 200-amp mains, however, that was incorrect. A Powerblaster can only pickup accurate usage from one main panel for a solar-only install, and there's no way to bring in usage data accurately with two 200 amp mains.

So long story short, I'll only get usage from one of my 200 amp mains. I'm surprised Tesla doesn't have a work-around for this. Having two 200 amp main panels can't be that rare, right?

While the PowerBlaster only has connections for two CTs, and they each need to be on a hot leg of the same circuit to measure current, you could get two additional CTs and put them on the other panel, and splice the wires together. The two sets of CTs in parallel will add and report the total flow.
 

BrettS

Active Member
Mar 28, 2017
2,109
2,512
Orlando, FL
While the PowerBlaster only has connections for two CTs, and they each need to be on a hot leg of the same circuit to measure current, you could get two additional CTs and put them on the other panel, and splice the wires together. The two sets of CTs in parallel will add and report the total flow.

This should work, but with one caveat. It’s possible that the powerblaster is only designed to read up to 200A per circuit. So as long as the combined total power draw of both panels stays under 200A then it should work fine. However, if the combined total ever exceeds 200A then you could have inaccurate readings or potentially even damage the powerblaster.
 

pdx_m3s

Active Member
May 18, 2019
1,325
1,160
Portland, OR
While the PowerBlaster only has connections for two CTs, and they each need to be on a hot leg of the same circuit to measure current, you could get two additional CTs and put them on the other panel, and splice the wires together. The two sets of CTs in parallel will add and report the total flow.

This is exactly how it was wired. And it never reported accurate consumption. It usually reported solar generation as home consumption... In that when I was producing say, 5kW, the app would show that I was consuming 10kW, even though there was actually nothing on/running in the house.
 

pdx_m3s

Active Member
May 18, 2019
1,325
1,160
Portland, OR
Well I've been up and running for a month and a half now. Production was very strong in October, as we had a lot of sunny weather, but fell off a cliff in November when the sustained rains came (as expected). Had I been producing for the full month of October, I would have beaten the PVwatts estimate by a lot. November was spot on.

Grey line is average daily production for the month. Orange is life-to-date cumulative. October production was 500kWh (full month would have been ~860kWh) and November was 392kWh.
Screenshot 2020-12-01 085311.png



PVWatts estimate:
Screenshot 2020-12-01 085442.png
 
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smaster553

Member
Feb 5, 2021
53
12
New Jersey
Just bought a 25 year extended warranty for the inverter for $307. Now everything, including panels, optimizers, and the inverter are covered for 25 years.
How can one buy the extended warranty? What number to call, or email to send to. I have 10kW and a 3.8kW invertor. Thought let me also buy it before I file my taxes and claim 26% off that warranty also. What does everyone think about it? As the warranty is part of the system, it should be eligible for the 26% rebate.
 

h2ofun

Active Member
Aug 11, 2020
2,490
426
auburn, ca
How can one buy the extended warranty? What number to call, or email to send to. I have 10kW and a 3.8kW invertor. Thought let me also buy it before I file my taxes and claim 26% off that warranty also. What does everyone think about it? As the warranty is part of the system, it should be eligible for the 26% rebate.

Never thought about putting on my taxes but would have to do for next year
 

stephen503

Member
Apr 18, 2019
91
54
Portland, Oregon
Well I've been up and running for a month and a half now. Production was very strong in October, as we had a lot of sunny weather, but fell off a cliff in November when the sustained rains came (as expected). Had I been producing for the full month of October, I would have beaten the PVwatts estimate by a lot. November was spot on.

Grey line is average daily production for the month. Orange is life-to-date cumulative. October production was 500kWh (full month would have been ~860kWh) and November was 392kWh.
View attachment 613464
Hey fellow Oregonian! I’m in Beaverton and have a Tesla Solar order in that’s in the early stages of the process. Out of curiosity, where is this data from? I‘m looking forward to nerding out on the numbers after install so just want to get prepared on different methods to track production/usage.

Thanks
 

pdx_m3s

Active Member
May 18, 2019
1,325
1,160
Portland, OR
Hey fellow Oregonian! I’m in Beaverton and have a Tesla Solar order in that’s in the early stages of the process. Out of curiosity, where is this data from? I‘m looking forward to nerding out on the numbers after install so just want to get prepared on different methods to track production/usage.

Thanks

It's a spreadsheet I built. Basically just formulas, pivot tables, and pivot charts. I export the daily data from the Tesla app, paste it in the spreadsheet, and refresh. Here's an updated one. Basically it show the performance of the system (green lines) relative to what PVWatts says it should do (grey lines).

Screenshot 2021-03-23 101410.png
 
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