Want to build a 24 panel off grid system to charge the car. How many wall units do I need. Do I need inverters.
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Off grid system
- Thread starter JamesG
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- Tesla Energy
Tam
Well-Known Member
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.
I read that SolarEdge works with Powerwall. They have announced a new inverter with integrated EV charger: https://www.solaredge.com/sites/default/files/inverter-integrated-EV-charger.pdf . I believe I read that was due to be available at the end of the year. I don't know if it will work off-grid, though.
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.
nwdiver
Well-Known Member
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?
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.
JSkrehot
Member
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.
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.
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.
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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