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Poll Results
 
 Wanwha vs Sunpower
 Wanwha 0 0%
 Sunpower 0 0%
Total votes: 0   Please or register an account to vote.


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yeahman

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Posts: 9
Reply with quote  #1 
Hello,

I am ready to buy a system After several quotes, I have a system using Hanwha 300 watts panels (39 panels) with micro inverters  from a local installer for $30500 ($21350 after tax credit)  with 12 years on the panels or Sunpower with microinverters  for $36,000 ($25,200 after credit) with 330 watts (33 panels) and amazing 25 years warranty. The difference of $3850 seems like a lot but the 25 years warranty seem very good too.  Should I pay the difference for Sunpower?

stmbtwle

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Posts: 2,747
Reply with quote  #2 
Can't speak for the panels, they both have a 25 year performance warranty.

I would go with the microinverters. Personally I think they're safer and more versatile.

Sunpower panels ARE more efficient, but that just means the panels are smaller for the same wattage or produce more power for the same square footage. However if space isn't an issue, it doesn't really matter. Watts are watts.

Sunpower 33 x 330 = 10890 w; $25200 / 10890 = $2.31 / watt
Hanwha 39 x 300 = 11700 w; $21350 / 11700 = $1.82 / watt

I like Sunpower, but the math tends to point to the Hanwhas.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
yeahman

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Posts: 9
Reply with quote  #3 
They both have the performance warranty of 25 years but from what I have been reading if the panel stop working the performance warranty will not protect you.  Only the product warranty.
stmbtwle

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Reply with quote  #4 
Can't say. The devil is in the details.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
16vjohn

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Posts: 8
Reply with quote  #5 
I ended up going Hanwha on price as well. I installed 33 of these:

https://s3.amazonaws.com/ecodirect_docs/HANWHA/Hanwha_Q_CELLS_Data_sheet_QPEAK_BLK-G4.1_290-300_2016-09_Rev03.pdf

Yes, the warranty is 12 years, but here's my thinking. If the economics of PV in the next 12 years is anything like it has been in the last 12, then replacing a few panels won't be a big deal. Further, my ROI is somewhere around 12-15 years... so that panel will have nearly paid for itself by then anyway. Lastly, a panel is solid state. There are really only a few ways a panel can die. Either failed solders, or failed diodes in the junction box. Most panels are an arrangement of series/parallel circuits. It's extremely unlikely that all parallel circuits will die simultaneously. So, the diode may fail, or a solder may fail, but that'll only decrease the panel's output proportionally to the size of that individual circuit. I'll be able to detect that by analyzing panel performance data, and hopefully the performance guarantee will take effect. Worst case scenario, the panel completely dies at year 13. I'll remove the panel, crack open the junction box and see if I can repair it myself with a multimeter. Panels are very, very simple.

I don't see how you can go wrong at $1.82/watt.

Good luck.
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