Using Cybertruck to top up offgrid solar system instead of a generator

markvan

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I live offgrid with no connection to external electricity provision.
I have a 7 year old 10KW offgrid solar system with 1800ah 2V gel batteries which has perfectly run the whole property but has gotten down to 40% charge after a week of bad weather. I don't have a backup generator, quoted about $10k AUD.
I'm thinking that because the Cybertruck has a power outlet I could use that to recharge my house system after bad weather as there is a supercharger only 30mins away. Is there any misunderstanding I have as to whether this is possible?
Also, I've heard that Powerwall is not available for offgrid, it must be grid connected, Is this actually true?
The time will eventually come to replace the gel batteries and I like the idea of using Powerwalls to power my property and vehicle.
 

Ehninger1212

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Correct, power wall is not made to be a dedicated off grid power supply. Just a thought, would you be better off putting that 10k AUD into more solar panels? or storage?

Also, we dont know enough about how much power the CT will be able to supply. So probably not best count on it running the whole home at this point.
 

TyPope

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Correct, power wall is not made to be a dedicated off grid power supply. Just a thought, would you be better off putting that 10k AUD into more solar panels? or storage?

Also, we dont know enough about how much power the CT will be able to supply. So probably not best count on it running the whole home at this point.
If the CT has VTG, It'll supply up to it's complete battery of power, say 175 Kwh of power.
 

Ehninger1212

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If the CT has VTG, It'll supply up to it's complete battery of power, say 175 Kwh of power.
Right.. if, we simply dont know yet. I sure hope it does.
 

ajdelange

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Power walls definitely can be used in an off grid system (any system in which the utility goes down is an off grid system during that time). There is some trickery required involving the Powerwall synthesizer reference which must be set to a frequency compatible with the inverter (or microinverters) used with the solar panels.

The CT won't have V2G or indeed V2H except in the sense that it has 240 VAC receptacle(s) in the bed. These should be like any other 240 source (adjust for differences between electrical systems in US and Oz e.g. the trucks sold in Oz will have 50 Hz inverters) and as such could presumably be used to top off batteries in a solar system. Theoretically there is no reason why this source could not mimic a backup generator and thus charge Powerwalls too. But two possibilities suggest themselves:
1)Tesla will think this is a great idea and provide special software/firmware in the app, Powerwall and CT to facilitate it
2)Tesla will conclude that this is a bad idea (for whatever reason one of which might be to get you to buy more Powerwalls) and take steps to prevent you from doing this, e.g. declaring that it voids Powerwall and/or CT warranties. I have free supercharging. I doubt that Tesla would like it if I drove into town, picked up a charge, drove home and used that charge to run my house.

My crystal ball is in the shop for its annual polishing so I can't be any more definite. Bottom line is that technically I see no reason that you could not do what you are proposing,
 

                           











 
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