Home Solar Battery and V2H

[CGM55082]

With rumors of Rivian enabling V2H in the near future, I wanted to ask the mindhive for their thoughts on my situation.

I have a 7.5kWh Tesla solar panel array on my house, but I do not have any batteries connected to the system. Given my state is soon moving to NEM3, I was considering adding a battery, so I can store electrons during the middle of the day for my use during the increasingly expensive peak hours at night. The only thing is, adding a battery is probably a $7K to $10K net cost (after federal rebates, etc.). The Tesla powerwall is also only 14kWh, so it seems silly to spend that kind of money on something that is like a tenth as large as the battery in my truck if V2H is truly a possibility in the near future.

My first question is if V2H only works one way? In other words, in theory would I be able to push power generated during the day from my solar panel system to the truck's battery and then pull from it at night?

If you were in my situation, would you install a dedicated solar system battery now or wait for V2H?

Any advice appreciated.

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[Madsen203]

House batteries have a ROI of like 20
Years in CA PGE rates. Most are only rated for 10 years of use at 80%. So in short, even if you waited 2 years for V2H capability, you’re better off than putting in any sort of house batteries. However, the house batteries will be a better option if you’re a heavy amperage user as V2H will likely limit to 40-60a. Batteries you can push that limit if running multiple batteries.

 

[SANZC02]

With rumors of Rivian enabling V2H in the near future, I wanted to ask the mindhive for their thoughts on my situation.

I have a 7.5kWh Tesla solar panel array on my house, but I do not have any batteries connected to the system. Given my state is soon moving to NEM3, I was considering adding a battery, so I can store electrons during the middle of the day for my use during the increasingly expensive peak hours at night. The only thing is, adding a battery is probably a $7K to $10K net cost (after federal rebates, etc.). The Tesla powerwall is also only 14kWh, so it seems silly to spend that kind of money on something that is like a tenth as large as the battery in my truck if V2H is truly a possibility in the near future.

My first question is if V2H only works one way? In other words, in theory would I be able to push power generated during the day from my solar panel system to the truck's battery and then pull from it at night?

If you were in my situation, would you install a dedicated solar system battery now or wait for V2H?

Any advice appreciated.

I added a power-wall to my array this year when the rebate went up to 30%. It has been working great for me and have no regrets.

Keep in mind it will probably be 2 or 3k to setup the vehicle for VtoH and it only works if connected. With the power-wall it allows your array to power the house during an outage. I only have half of my house on the battery during an outage but it pulls for the whole house during peak not just what is set for backup.

If the do release the VtoH I will probably still set it up but am still glad I did the power-wall.

 

[Mark_AZR1T]

As an emergency back-up if V2H were available now, it could come to bat in a pinch....I have 16kW and 3 Tesla Powerwalls. Zero regrets and my ROI is less than 7 years in the AZ desert. 100% off the grid, hedge against rising power increases, brown outs, black outs and peace of mind, PLUS I can readily provide 50-60 miles per day from my arrays for two EV's....(partial gas station)....and keep the batteries pretty much topped off....

 

[CGM55082]

With V2H, can the power the solar panels generate during the day be pushed to the truck's battery for later use, or is V2H one way, meaning that the truck battery can only push to the house?

 

[Dark-Fx]

With V2H, can the power the solar panels generate during the day be pushed to the truck's battery for later use, or is V2H one way, meaning that the truck battery can only push to the house?

It's generally bi-directional. Excess power would get exported to the truck. Really depends on the implementation though.

 

[MoreTrout]

My solar is Enphase with IQ8s and sunlight backup, so I can use any production the panels have even if the grid goes down without storage. Enphase announced their bidirectional EV product with a plan to release it in 2024. They are also due to release pricing and specs on their next gen home battery any day now (1st half of 2023, and they have generally been better than Rivian at keeping timelines). CEO keeps touting it will be a "significant step down in price" compared to the last version, and also have twice the charge/discharge power. Ultimately I would prefer the bidirectional EV option. The CCS standard it supports is one Rivian uses, so should work if Rivian gets around to actually opening the capability. When the next gen home battery pricing gets released I'm going to weigh my options again.

 

[connoisseurr]

My entire system is DIY using Enphase hardware, and REC 405W panels. My ROI will be met in 4-6 years, due to the super low cost I paid of doing the work myself. With the announcement of Enphase's bidirectional charger, I added a new conduit run from my garage, back to where the Enphase System Controller sits on the house. Will definitely be taking advantage of that.

I also have rough-in for Enphase batteries, but opted to not proceed with them once I heard about the Enphase bidirectional charger being released, AND Rivian announcing V2H is still on the table. Worst case, I just get the batteries and install.

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