Is anyone aware of any kind of device that can just pull 10kW from the CT and dump it to the grid?

[LeeS]

Hello all,

I'm trying to figure out a way to force the CT to pour it's power back to the grid. I have solar with PW3's, so PS isn't an option right now, and it might not actually serve this purpose when they do finally turn it on.

I know I can hook up a 10kW welder to the 240v plug in the bed and pull 10kW continuous from that outlet. Is there any kind of device that can be set to pull a specific amount of power and just pass it along with minimal losses? Something that would act like a 10kw load to the CT, but act as a 10kw generator back feeding into the panel.

Does anyone have any idea how I can do this?

Thank you.

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[txtravwill]

You can't just export to the grid ever from CT right? At best you can use PowerShare to create a closed home circuit and drain the truck from devices like usual. I'm not aware of any device that will feed the grid metered energy back outside of solar that is coordinated by the gateways made by Tesla, and that is always just excess solar it seems.

 

[mongo]

Hello all,

I'm trying to figure out a way to force the CT to pour it's power back to the grid. I have solar with PW3's, so PS isn't an option right now, and it might not actually serve this purpose when they do finally turn it on.

I know I can hook up a 10kW welder to the 240v plug in the bed and pull 10kW continuous from that outlet. Is there any kind of device that can be set to pull a specific amount of power and just pass it along with minimal losses? Something that would act like a 10kw load to the CT, but act as a 10kw generator back feeding into the panel.

Does anyone have any idea how I can do this?

Thank you.

Bed outlet is 9.6kW max. But to your question.
240VAC ->HVDC power supply -> Solar inverter (could maybe use PW's)

Cybertruck warranty doesn't support this though.

 

[LeeS]

Bed outlet is 9.6kW max. But to your question.
240VAC ->HVDC power supply -> Solar inverter (could maybe use PW's)

Cybertruck warranty doesn't support this though.

Hmm, very clever, and I'll see if anyone can help me come up with anything AC to AC, instead of going AC->DC->AC, but so far that might actually be viable. Now I'd just need to find a suitable HVDC that can give me 350V at 30A.

I see that I have MPPT1-3 occupied on each of my PW3, with MPPT4-6 available on both.

It appears that my "nominal DC voltage" is 350VDC, so, in theory if I were to pull 9.6kw at 240VAC using a power supply, I could run 8ga from the PS to a splitter, then 10ga to into the MPPT6 inputs on each PW3 and make it them think there are another 2 strings plugged in.

Is anyone aware of any other artificial barriers I'd need to figure out? Like, having to go into each PW to configure the new string, or whether there would be any benefit to getting 2x 20A PS instead of 1x 40Adc PS?

For all the lawyers on this forum, this is a thought experiment and no advice will incur any sort of liability. I'm just looking for the theoretical barriers to pulling free solar KWh's from the CT and shoving them down the utility company's throat during peak pricing.

Thanks again

 

[hemiarch]

Why would one want to do that? Capitalize on free sc to sell power to the grid?

 

[mikeg112]

Try using an Ecoflow delta pro ultra with a few batteries, one will give you 3KW ac input charging, if you get 3x inverters, batteries and smart home panel that would get you 9kw of charging capacity

 

[RandyS]

This could just be a semantics thing, but you said "pour its power back to the grid". As a retired 36 year power system utility engineer, there are safety red flags galore with pouring power back into the grid. Maybe you meant feed loads in the home?

If you really meant "grid", the huge safety issue that everyone worries about is how to ensure that the truck (or any) generation is immediately and reliably tripped off when feeding the grid in the case of a grid outage. It has to be fool proof and work every single time under any conditions.

The utility can't have personnel working in a grid outage situation where a customer generator of any type is suddenly trying to enerize the circuit feeding back to the grid.

So, having said that, did you really mean "Grid" or did you mean "Home"?

 

[NoleusMaximus]

Probably not the safest idea to "pour" power back to the grid - more like provide a modest 2-3kW at most. With a foundation series 220VAC outlet you could maintain the warranty at 10 amps with a fair amount of safety. My home solar is a Lion Energy lithium iron battery and Enphase inverter. I could disconnect from the grid and charge by battery with the CT then reconnect and supply power to the grid beyond the energy used by my home under my utility free metering agreement.

Those with a Powerwall could probably save a step but I must emphasize that you should always stay within all devices listings. By listing I mean approved for the intended use by an independent testing laboratory like UL of equivalent. I have not taken the time to actually have my system programmed to use off peak power from the grid and supply power during leak load periods but my buddy did and his electric savings is substantial. It took many hours and a combination of techs including the city electric utility, inverter vendor, and my solar contractor to finally see the savings.

You should also check with your local utility to see what you are allowed to provide power to the grid as most states have rules about what credit could be given. In Florida it is net metering and I get credit for the power provided against my standard usage.

 

[LeeS]

Why would one want to do that? Capitalize on free sc to sell power to the grid?

No free supercharging. I have a 400kw solar array where I park during the day, so I'd like to charge up the CT on free solar at this first location, then drive that power to a second location where I can unload it at a profit.

 

[LeeS]

This could just be a semantics thing, but you said "pour its power back to the grid". As a retired 36 year power system utility engineer, there are safety red flags galore with pouring power back into the grid. Maybe you meant feed loads in the home?

If you really meant "grid", the huge safety issue that everyone worries about is how to ensure that the truck (or any) generation is immediately and reliably tripped off when feeding the grid in the case of a grid outage. It has to be fool proof and work every single time under any conditions.

The utility can't have personnel working in a grid outage situation where a customer generator of any type is suddenly trying to enerize the circuit feeding back to the grid.

So, having said that, did you really mean "Grid" or did you mean "Home"?

Sorry, I meant "shove KWH down the utility company's throat" in a "f#$k you, pay me" situation.

They lobby for rate increases annually, refuse to upgrade their infrastructure, retire nuclear and renewable sources of energy, so I want to do my part to accelerate their transition to renewable and sustainable energy sources.

There is NO difference between a KWH coming from a CT as opposed to a PW. There is nothing magic about electricity either.

Assume I will use safety standards that exceed NEC/UL/CES standards in this thought experiment.

You do bring up a good point though, that anything I set up would need to be able to instantly shut off in the event of a grid outage in the exact same way a PW/solar string would, so thank you for that component.

 

[hemiarch]

No free supercharging. I have a 400kw solar array where I park during the day, so I'd like to charge up the CT on free solar at this first location, then drive that power to a second location where I can unload it at a profit.

Yeah. I’d charge up something capable of a high dc output and then Input that into one of
Your powerwalls mppt’s to keep it full thereby making it “think” its getting native solar input.
Then it will export and participate in VPP to its little Optimus hearts content.
Even a 12v 30 amp source over 24hrs can provide about 9kwh. So you can multiply that by however many mppt’s are still available on your powerwall.
Double that if you’re doing 24v and quadruple if the battery is 48v.
You can supplement a generous amount of power this way.
There are those Chinese V2l devices but I probably wouldn’t risk the old firestarter 5000.
https://tlyard.com/products/10kw-v2...MIy7WkzJf1jwMVWSRECB38zAX3EAQYAiABEgINU_D_BwE
Especially not in a sustained fashion.
If you do it this way, the above mentioned safety concerns which are very legitimate will be taken care of by the collar system on the powerwall.

 

[LeeS]

Probably not the safest idea to "pour" power back to the grid - more like provide a modest 2-3kW at most. With a foundation series 220VAC outlet you could maintain the warranty at 10 amps with a fair amount of safety. My home solar is a Lion Energy lithium iron battery and Enphase inverter. I could disconnect from the grid and charge by battery with the CT then reconnect and supply power to the grid beyond the energy used by my home under my utility free metering agreement.

Those with a Powerwall could probably save a step but I must emphasize that you should always stay within all devices listings. By listing I mean approved for the intended use by an independent testing laboratory like UL of equivalent. I have not taken the time to actually have my system programmed to use off peak power from the grid and supply power during leak load periods but my buddy did and his electric savings is substantial. It took many hours and a combination of techs including the city electric utility, inverter vendor, and my solar contractor to finally see the savings.

You should also check with your local utility to see what you are allowed to provide power to the grid as most states have rules about what credit could be given. In Florida it is net metering and I get credit for the power provided against my standard usage.

Before I "thought experiment" this, I would examine my bill to see how kwh are credited on a TOU plan, as I have not seen that yet.

In PA, the utility shall pay retail rates for every kwh supplied.

So, if PTC is $0.12/kwh and peak is $0.31/kwh, is my supply split into buckets to offset usage in that TOU, then true-upped by bucket? Or is overproduction always just PTC?

I'll wait a few billing cycles now that this new system is online and probably post another thread. I can't imagine I'm the only one who has done the math and figured out that this setup could theoretically generate >$10k in overproduction annually. Even if it end up just being ~$5k in profit per year, a business doesn't need to show a lot of profit, it just needs to show profit.

 

[LeeS]

Yeah. I’d charge up something capable of a high dc output and then Input that into one of
Your powerwalls mppt’s to keep it full thereby making it “think” its getting native solar input.
Then it will export and participate in VPP to its little Optimus hearts content.
Even a 12v 30 amp source over 24hrs can provide about 9kwh. So you can multiply that by however many mppt’s are still available on your powerwall.
Double that if you’re doing 24v and quadruple if the battery is 48v.
You can supplement a generous amount of power this way.
There are those Chinese V2l devices but I probably wouldn’t risk the old firestarter 5000.
https://tlyard.com/products/10kw-v2l-discharge-device-for-tesla-s-x-3-y-high-performance-power-supply-with-multiple-output-options-nema-standard-tlyard?currency=USD&variant=56497349853565&utm_source=google&utm_medium=cpc&utm_campaign=Google Shopping&stkn=db317da8787d&gad_source=1&gad_campaignid=22031848010&gbraid=0AAAAAomSLkFXuEqeQaI8JE467jGB8hiER&gclid=EAIaIQobChMIy7WkzJf1jwMVWSRECB38zAX3EAQYAiABEgINU_D_BwE
Especially not in a sustained fashion.
If you do it this way, the above mentioned safety concerns which are very legitimate will be taken care of by the collar system on the powerwall.

Wow, there is actually a device, how about that. Yes, if I were to make use of a device like this, I'd set it up on a bed of sand under a foam fire suppression system, lol, but I clearly am NOT the first person to wonder about this opportunity.

Thank you for taking the time to provide a direct link to a potentially viable product!

 

[hemiarch]

You have a better device in the bed of your truck though. It’s just a matter of the efficiency loss of turning it back into dc that’s digestible by your powebank which in this case is the powerwall.

 

[LeeS]

You have a better device in the bed of your truck though. It’s just a matter of the efficiency loss of turning it back into dc that’s digestible by your powebank which in this case is the powerwall.

I absolutely agree, a native setting would be best.

I'm not too worried about losses, because, as I said, I fill up for free on solar at 11kw, so even in December I'd be fully recharged by 12pm, whether I depleted 40kwh with no losses or 50kwh with losses the night before.

And yes, I have my eye on a megapack as a side hustle.

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