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What hours should I run my Powerwalls

h2ofun

Active Member
Aug 11, 2020
2,932
562
auburn, ca
Thanks for your input, I have read everything about self powered and still not sure if I should just run the Powerwalls longer on timed based or do self powered. The difference between peak charge and off peak is minimal so not saving much by just running the batteries from 4 to 9.
If ones peak vs non peak is not any big deal, what is the value of even using batteries when the grid is up? One loses 10% with the batteries.
 

jboy210

Supporting Member
Supporting Member
Dec 2, 2016
5,387
3,343
Northern California
We are on PG&E TOU-B, peak 4-9 PM. We use Advanced-Balanced with a reserve of 30%. With these settings were are 97+% self-powered on most days unless it is heavy overcast or raining.
 

h2ofun

Active Member
Aug 11, 2020
2,932
562
auburn, ca
We are on PG&E TOU-B, peak 4-9 PM. We use Advanced-Balanced with a reserve of 30%. With these settings were are 97+% self-powered on most days unless it is heavy overcast or raining.
I am on TOU-C. set peak for 3pm to 1am. Reserve 10%. Without AC so far much, 99% off grid. Batteries recharge around noon.
 

MJ_CA_2019

Member
Aug 19, 2020
159
43
Central CA
What hours are you setting to run the house on the Powerwalls.

We are on PG&E TOU-B, peak 4-9 PM. We use Advanced-Balanced with a reserve of 30%. With these settings were are 97+% self-powered on most days unless it is heavy overcast or raining.

I am also on TOU-B, 3 Powerwalls and 15% reserve.

M-F
Peak: 4-9 PM
Off Peak: everything else
Shoulder / Partial Peak: Not used

Sat / Sunday
"All day off peak"
 
Mar 15, 2021
279
114
California
My billing has peak rates from 4-9 at $0.41 and off peak at $0.17. So I set mine to Balanced with peak from 4-9 during the winter. I run off the battery during peak and impermanently during the night until it reaches my reserved settings.

During the summer I set my peak to 7-9 and shoulder from 4-7. This way I still use much of the solar during the 4-7 hours with the battery providing the balance that solar may not provide
 

jboy210

Supporting Member
Supporting Member
Dec 2, 2016
5,387
3,343
Northern California
What hours are you setting to run the house on the Powerwalls.
I don't set any hours other than the peak. 4-9 PM. The Powerwall Gateway makes all the other decisions, and at 97+% self-powered seems to be doing a good job. From what I read, the advanced modes use a Machine Learning model that gets tweaked with your usage pattern.

Unless the battery is low or our load is very high, during the peak we are powered by the batteries. After that time, we usually have sufficient charge to cover us until the next day when solar takes over.
 

h2ofun

Active Member
Aug 11, 2020
2,932
562
auburn, ca
I don't set any hours other than the peak. 4-9 PM. The Powerwall Gateway makes all the other decisions.

Unless the battery is low or our load is very high, during the peak we are powered by the batteries. After that time, we usually have sufficient charge to cover us until the next day when solar takes over.
move the bars to change the settings
 

h2ofun

Active Member
Aug 11, 2020
2,932
562
auburn, ca
Why don’t you do self powered.
Because I need to send as much power back to PGE for credit so it can be used during winter. For folks who have gas heat, one never has to worry about it. But for folks like me that have electric heat, it actually takes more than AC. So, without NEM2, and 99% electric, solar would not make any sense from an ROI.
 

Merrill

Merrill
Jan 23, 2013
4,001
1,450
Sonoma, California
Ok, I really appreciate everyone’s input but now I’m very confused it seems like hardly anyone is doing the same thing with their Powerwalls. My main goal would be to use the least amount of grid power but also get as many credits during the summer to help offset the winter usage without as much solar.
 

RKCRLR

Member
Apr 13, 2020
465
191
Garden Valley, CA
As others have mentioned, it depends on your goal.
My goal is to have a $0 true-up while minimizing the use of the Powerwalls.
I use Cost Savings mode, set the Peak to correspond with PG&E's peak , and set shoulder to start the same time as Peak and end at midnight.
Right now my reserve is set at 60%, I'll tailor that to hone in on the $0 true-up.
But my system is sized such that my total solar production is about equal to my annual usage in kWh.
 

h2ofun

Active Member
Aug 11, 2020
2,932
562
auburn, ca
Ok, I really appreciate everyone’s input but now I’m very confused it seems like hardly anyone is doing the same thing with their Powerwalls. My main goal would be to use the least amount of grid power but also get as many credits during the summer to help offset the winter usage without as much solar.
This is what I believe I am trying to do. I use 99% from battery and solar. Ship back all my solar when batteries are full, and minus house use. Then at 3pm, ship all my solar back at peak rates. So, your goal, and my goal are the same.
 

h2ofun

Active Member
Aug 11, 2020
2,932
562
auburn, ca
As others have mentioned, it depends on your goal.
My goal is to have a $0 true-up while minimizing the use of the Powerwalls.
I use Cost Savings mode, set the Peak to correspond with PG&E's peak , and set shoulder to start the same time as Peak and end at midnight.
Right now my reserve is set at 60%, I'll tailor that to hone in on the $0 true-up.
My first goal is to keep the wife happy!!!!! So going for 74 temp in the summer, and next winter, will set heat at like 66 or 68. After that, a zero ENERGY true up is my goal, plus a little propane. I could case less how much the PW's get used, that is what the warranty is for :)
 

RKCRLR

Member
Apr 13, 2020
465
191
Garden Valley, CA
My first goal is to keep the wife happy!!!!! So going for 74 temp in the summer, and next winter, will set heat at like 66 or 68. After that, a zero ENERGY true up is my goal, plus a little propane. I could case less how much the PW's get used, that is what the warranty is for :)
I keep my thermostat set for comfort also.

Personally, I believe the Powerwalls can last beyond the warranty period and that how long they last beyond that is proportional to how much they are used.
Yes, age is a factor but I believe it is second order compared to usage.
 

h2ofun

Active Member
Aug 11, 2020
2,932
562
auburn, ca
I keep my thermostat set for comfort also.

Personally, I believe the Powerwalls can last beyond the warranty period and that how long they last beyond that is proportional to how much they are used.
Yes, age is a factor but I believe it is second order compared to usage.
No one has any real idea how long they will last vs use, storage level, etc. Just one thing I am willing to ignore and live with whatever happens. We can compare our two different use approaches as the years go by and see if it makes any difference.
 

RKCRLR

Member
Apr 13, 2020
465
191
Garden Valley, CA
No one has any real idea how long they will last vs use, storage level, etc. Just one thing I am willing to ignore and live with whatever happens. We can compare our two different use approaches as the years go by and see if it makes any difference.
I agree, but from everything I've seen, in general the driving factor on how long rechargeable batteries last is cyclic usage, not age.
 

miimura

Well-Known Member
Aug 21, 2013
6,491
6,250
Los Altos, CA
Ok, I really appreciate everyone’s input but now I’m very confused it seems like hardly anyone is doing the same thing with their Powerwalls. My main goal would be to use the least amount of grid power but also get as many credits during the summer to help offset the winter usage without as much solar.
My advice - try different settings and see what it does. If you don't like something, try it a different way. The reason people do things differently is that everyone's situation is different.

Here are the big gotchas in my mind.
1. Don't charge an EV from Powerwall energy. It's a waste of battery cycles. Use TBC and define an Off-Peak period to charge your car. This should prevent Powerwall discharge while the EV is charging. If you really want to optimize for self-consumption and you're home during the day, set the car to charge slowly while you're generating the most solar. Tesla does not provide an automatic way to charge from surplus solar. They really should implement that feature.
2. If you have TOU utility rates, align the Peak hours in the Powerwall schedule to the utility schedule. You can fudge the Off-Peak and Shoulder to adjust how the system works at other hours.
3. If you want TBC to act the most like Self Powered, set your solar generating hours to Shoulder, even if the utility considers it Off-Peak.
 

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