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Powewall + Solar City Leased Panels

Discussion in 'Tesla Energy' started by K-MTG, Jan 13, 2016.

  1. K-MTG

    K-MTG Sunshade Captain of TMC

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    Hi,

    I am currently on a 4 kwh Solar City leased (20 year) system and reserved the Powewall. I have a Solar Edge inverter as well. Would I be able to use the Powerwall with my current leased inverter? Or, will I have to purchase a 2nd inverter for my system. If so, how much do they cost? I plan on purchasing the 7 kwh powerwall, which will charge using excess generated solar as well as on off peak rates from my utility and provide power when needed to lower my utility bill as well as to provide a backup in a power outage. Would appreciate any info regarding this.

    I use lots of power about 50-70 kwh a day excluding EV charging.

    Thanks
     
  2. macpacheco

    macpacheco Member

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    Powerwall uses a high voltage (350-450VDC), so most likely your inverter won't be compatible.
    Your solar panels will likely need to be rewired to produce this higher voltage too assuming 12V panels something around 30 panels in series are needed to produce this voltage.
    PS: I'm neither an electrician, nor own a solar system. I understand a lot about electricity for a non engineer/technician.
     
  3. K-MTG

    K-MTG Sunshade Captain of TMC

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    #3 K-MTG, Jan 14, 2016
    Last edited: Jan 14, 2016
    Do you know how much a compatible inverter will typically cost? Here is a photo of my current inverter: IMG_3314.JPG
     
  4. K-MTG

    K-MTG Sunshade Captain of TMC

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    Also, I actually have a 4.845 KW system. I attached a photo of my inverter specs from the design page provided by Solar City. Thanks again for your help @macpacheco 2.png 1.png
     
  5. essaunders

    essaunders Member

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    #5 essaunders, Jan 14, 2016
    Last edited: Jan 14, 2016
    I'm getting my own (non-solar city) Edge-based solar put in. I've been investigating the powerwall (for backup). I've been told that to best provision for the battery, I should get the SE7600A inverter. that is the one that SolarEdge has based their 'storedge' system around. note that the storedge system has a different, bigger disconnect on the bottom

    see the linked PDF for more info!

    http://www.solaredge.us/files/pdfs/preparing_for_storedge_upgrade_on_grid_and_backup_na.pdf


    edit to add: A coworker of mine has a Solar City system. apparently they briefed him on a 'backup system' It was something like on the order of $6000 for a system that he only got to keep (didn't own) for ~9 yrs. He said it wasn't a good deal in his view (he had to find the ppt they sent in his computer trash...).
     
  6. K-MTG

    K-MTG Sunshade Captain of TMC

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    So I would assume it would not work with my current SE3800A system?

    - - - Updated - - -

    Is it 6k including the power wall?
     
  7. electracity

    electracity Active Member

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    I read $3500
     
  8. K-MTG

    K-MTG Sunshade Captain of TMC

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    Oh wow, it cost more than the powewall.
     
  9. K-MTG

    K-MTG Sunshade Captain of TMC

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    Thought I jump back to this, now that powerwall V2 is available. In terms of installation and what I need to buy, how would it work? Appreciate it, thanks!
     
  10. outie

    outie Member

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    Just place an order and they will probably contact you and give you an estimate before you commit some time in January. I would think you need a new inverter for the solar.
     
  11. K-MTG

    K-MTG Sunshade Captain of TMC

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    Doesn't powerwall 2.0 have the inverter built in?
     
  12. outie

    outie Member

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    I thought that inverter is for the battery itself. You still need the solaredge inverter for your solar system. Maybe this way you actually don't need to replace the solar inverter (like a SE7600). I am also interested but don't have a SE7600.
     
  13. K-MTG

    K-MTG Sunshade Captain of TMC

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    Yea, I don't want to replace my inverter either. Hopefully, Tesla will provide more info on this.

    I got a $11k quote for one powerwall 1.0 over the phone so I hope this is much cheaper.
     
  14. outie

    outie Member

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    Did you order the 2.0 yet?
     
  15. K-MTG

    K-MTG Sunshade Captain of TMC

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    No, did you?
     
  16. outie

    outie Member

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    No. I just switched to TOU few days ago and want to see how that goes before deciding whether to add a battery system. I also want to know if I need to replace my solaredge inverter which I don't want to. I do like the idea of buying at 0.14 and selling 0.34 for winter and 0.13/0.44 for summer with SCE. It will only take few years to break even.
     
  17. wang5150

    wang5150 Member

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    I had pre-ordered PowerWall 1.0 but Tesla never contacted me other than sending me a survey and asking for my electric bill.

    I watched the Tesla event last night and I've pre-ordered two PowerWall 2.0 to help offset night time power needs. I'm on the time of use plan as well, but getting the PowerWalls along with my 18 kWh Solar City lease system will help smooth out my power generation and consumption curve.
     
  18. Ampster

    Ampster Member

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    Can you explain a little further. The most I was able to do was to offset my daily grid use during peak times (about 8kWhr per day) so that I could maximize the credit generated at those rates. I saved $2 per day. My payback on a $8000 hybrid homebuilt battery system was more like 14 years but I also got a backup for when the grid goes down.
     

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