Tesla Powerwall Self Powered vs Time Based
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- čas přidán 6. 05. 2023
- The settings tell you that time based control is the way to lower your bill the most but I think with some clever automations you can make more money on self powered mode.
My name is Brian and I'm passionate about watching people who choose to go solar go big and have a good experience with it.
It is 100% possible to cover your entire household electricity bill and your electric car miles and have excess production make you money. Stop listening to lame sales reps and people who tell you that home batteries and solar panels have a bad ROI.
Decide for yourself that you want energy independence and you want your home to be a self sustaining money maker and you can make that happen.
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We have 9.4 kw of solar panels, 2 Tesla Powerwalls, 2 Antminer s9 Bitcoin Asic miners, a Tesla Model Y, a smart PDU from SynAccess, and the Tesla Wall Connector for charging our electric vehicle. I also enjoy talking about suburban homesteading, rainwater harvesting, backyard ducks, and Bitcoin in general.
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I absolutely have the same view on how end-users should wisely configure the different energy production and usage profiles! Well done and great video!
Thanks for watching, always encouraging/exciting to meet other people thinking the smart home energy stuff through!
What you’re talking about wanting to happen in this video can be done by using smart SPAN electrical panels. This way you can utilize critical, nice to have or not important ranges for all circuits in your house.
that's awesome yeah I've heard of SPAN, do you have one? How is it?
They should add a seperate inverter for the car home charger so that it charges at 8 kilowatts instead of 5. Imagine that! I saw a gentleman that built a solar garage that Maximized solar for his teslas. Really cool idea. Problem is that the battery only allows so much to pass through
I have a grid-tied PV system and am on a NEM plan that gives me credits for any excess, I send them and then use the credits when I pull more grid power when needed. At the end of the year, any excess is "GIFTED" to my utility. My system is oversized so I will always OVER PRODUCE power on an annual basis. With that does it matter what I COULD pay or receive given I never get a bill now aside from my $15/mo connect fees?
I think, I'm similar to you. My TOU is 4pm - 9pm. Right now solar continues to run my house till 6pm. But TOU kicks battery in at 4pm. I'd rather TOU kick in at 6pm - 9pm then run off grid at much lower rate. Probably using 6% of 2x batteries. But it's either time based 4pm-9pm or 6pm'ish" till following morning.
I also make every effort to charge car during day off solar.
love it, that's a good flow
it makes sens that utility buys your power at wholesale rates, similar to how they buy power from other powerplants, these non bypassable sharges on top of the difference between what the utilities buy your power and retail rate they sell power to you is how they "tax" you to pay for the infrastructure. I am trying the self powered mode to see if it makes more sense cost wise by reducing my non bypassable charges. When April bill shows up, will compare it to April 2023 to see if I see a difference in total cost. ( 7.4kw solar plus three powerwall 2 )
That's sweet yeah definitely let me know what you find between the two modes
@@brainharrington Just got my true up bill dated June 3rd, 2024. only the last two months are self powered. NBC for May and June are $3.23 and $1.60 respectively.
for May and June 2023 they were $12.37 and $10.30. saving $17.74 in NBC
I expected to export less in May and June of 24 verses 23. May and June 24 I exported 550 and 883 Kw respectively and in 23 976 and 1169 respectively.
So in 2023 I exported 2145 on TOU setting.
In 2024 I exported 1433 Kw on self powered setting, a difference of 712Kw, based on my June 24 true bill I am reimbursed $0.04 for excess Kw exported so I lost $28.42 in power not exported. So for two months on self powered I lost $10.58 ( savings gains on NBC against lost exported power credit.
I can send you redacted true up bills for both years if you want to look at the data yourself
I question if Time Based Control (TBC) actually results in the lowest power bill. Even when I set the buy and sell prices the same, TBC exports my entire batteries (excluding the Backup Reserve) to the grid during peak hours and then uses grid power until the solar starts producing the next morning. As such, it is not taking into the non-bypassable charges or ~10% loss of running power through the batteries (i have two Powerwall 2's). I run my system similar to what you noted in the video, in that I try to use power (charge Powerwalls and car, run clothes dryer, etc.) during the middle of the day when I have excess solar generation. Ideally, TBC would learn how much power I need to make it through the night (about 30% on a normal day) and only export the difference being about 60% of the batteries (100% - 10% Backup Reserve - 30% night time use = %60%). Better yet, TBC would look at the weather, air quality and my usage pattern and hold back more power on hot days when I normally run the AC or when I can't open the windows at night to cool the house down when air quality is poor. Does anyone know of a 3rd party app that provides more flexibility in operating the Powerwalls?
Agreed! 100% I want to customize down to the activity like this exactly how you're saying. I also would throw in bitcoin mining, like I want it to automatically turn on bitcoin mining also when all other uses are full and its paying higher than grid export
You were complaining that during the peak time the system sends all solar to the grid and feeds the house entirely from the battery. I had the same complaint, and then I realized it was because I had set my sell price the same as my buy price during peak, and the system was trying to maximize profit. After I set the sell price to the same price as the off-peak sell price, then during peak the system ran off solar and supplemented with the battery, and only sent power back to the grid when there was more solar than the house needed.
Apparently there are some locations where you cannot send battery power back to the grid and so Tesla does not allow that option.
Really good to know! So inside Tesla app it's letting you change your sell price? Is that in the settings?
@@brainharrington You have to set up your utility rates manually. If you're just using the presets then you may not have that option.
I'm with SRP in Arizona, and Tesla still hasn't included their rates, so I had to set it up manually anyway.
@daryllafferty Can you provide an example of the buy/sell prices you use or a reccomendation on what I should use? I am on the TOU-C rate plan with PG&E in Northern California. Tesla App uses Off-Peak (buy and sell = $0.43) and Peak (buy and sell = $0.49). My utility bill says Off-Peak (buy = $0.40) and Peak (buy = $0.45). Not sure how best to calculate the actual sell price. Thanks!
So I just got solar and a tesla battery and been trying to figure out if i should choose self powered or Time based. Are you saying you use time based after adjusting the sell price?
gonna give this a shot. Just switched to time based and I set my peak sell price to match my off peak sell price
If you have enough battery storage, just go to slef-powered in CA under PG&E. You will never make money.