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Off grid system

Discussion in 'Tesla Energy' started by JamesG, Jul 24, 2017.

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  1. JamesG

    JamesG Member

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    Want to build a 24 panel off grid system to charge the car. How many wall units do I need. Do I need inverters.
     
  2. Tam

    Tam Active Member

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    I think in future, Tesla could design a Powerwall that can directly plug to your Tesla car.

    In the mean time, yes, you need one for conventional 240VAC setup.
     
    • Like x 1
  3. jpoet

    jpoet Member

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    • Like x 1
  4. doubleohwhat

    doubleohwhat Supporting Member

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    Which SolarEdge product are you referring to? The SolarEdge StorEdge was initially designed and introduced to work with the PowerWall 1. The latest version was updated to support the DC PowerWall 2. However, Tesla discontinued that product (DC version of PowerWall 2). So now they've further updated the StorEdge inverters/interfaces to work with LG Chem batteries. They've completely removed any mention of Tesla and Powerwalls from their latest brochure:
    https://www.solaredge.com/sites/default/files/single_phase_storedge_solutions_datasheet_na.pdf

    Basically, the SolarEdge inverters can only AC Couple to the PowerWall 2 just like any other inverter.
     
  5. nwdiver

    nwdiver Active Member

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    Why off-grid? When you say 'off-grid' do you mean 'no-grid'?
     
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  6. Ampster

    Ampster Member

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    One of the things that made the original PowerWall so efficient was that it ran off the 400v DC buss. Are you saying that the PowerWall 2 no longer does that?
     
  7. Webeevdrivers

    Webeevdrivers Member

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    You could go this way. Collects, stores, and charges 180 EV kilometers per day. Delivered to your door. Sets up in 10 minutes. No connection to the grid. 35000 bucks.

    [​IMG]
     
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  8. outdoors

    outdoors Wandering

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    Just might need a new hood after a while.
     
  9. JSkrehot

    JSkrehot Member

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    A 24 panel system will produce just over 40 kWh per day (during the summer months) if south facing with no obstructions, a self install system from gogreensolar.com (which I did) is just under $13,000, you will need 3 Powerwalls to maximize the power, at about $7,000 per unit with install. $34,000 is a lot of $$$ to pay to charge.
     
    • Like x 1
  10. Ampster

    Ampster Member

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    Our little California beach town tried one of these for a couple of weeks. It was an interesting concept but is way overpriced. We already have over 20 charging stations in a one square mile city and our local utility, SCE, has subsidized some of the installs.
     
  11. doubleohwhat

    doubleohwhat Supporting Member

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    There was originally going to be an AC and a DC version of the PowerWall 2. Tesla discontinued the DC version that would have worked just like PowerWall 1 (connects to the DC bus of an inverter). The only version of the PowerWall 2 that Tesla is currently manufacturing is the AC version where each PowerWall 2 unit has a built in DC-AC inverter and connects to the rest of the system via AC.

    Basically, there is no option (currently) to connect a PowerWall 2 to the 400v DC bus of an inverter. It's AC-coupling or nothing. This works fine if you're using microinverters or you already have a system installed with an inverter that doesn't support a battery connection. However, if you want max efficiency by only converting DC to AC when there is a demand, you're SOL with the PowerWall 2. SolarEdge has now chosen to go with LG Chem batteries due to the DC PowerWall being discontinued.
     
    • Like x 1
  12. Ampster

    Ampster Member

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    Thanks, I guess the partnership between Tesla and SolarEdge is no longer. I just saw a SolarEdge installation with a LG Chem battery pack.
     

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