Anyone using Tesla Powerwall?
Thread Starter
MBWorld Fanatic!
Joined: Oct 2010
Posts: 8,164
Likes: 4,383
From: Corona Del Mar, CA
2019 SL450, 2019 E450 Luxury Trim Wagon, 2024 BMW I7 xDrive60
Anyone using Tesla Powerwall?
I was curious if anyone here has a Tesla Powerwall setup and if so, if you are using it to charge your EV. We are planning a major home renovation and will install solar panels. I’m trying to learn about the most economical ways to charge an EV.
MBWorld Fanatic!
Joined: Jan 2023
Posts: 3,135
Likes: 1,205
GLE 580
Have you read about NEM 3.0?
http://solarnegotiators.com/blog/nem...-need-to-know/
https://www.energysage.com/blog/net-metering-3-0/
Under CA NEM 3.0, the payback period for solar systems with batteries may be quicker compared to systems without batteries. The NEM 3.0 policy has shifted from net metering to net billing, which significantly reduces the compensation rates for excess solar power sent to the grid. This change makes the inclusion of batteries more economically favorable, as they can store excess energy for use during peak demand times or when the sun isn’t shining, rather than sending it back to the grid at a lower credit rate. While a battery is not required under NEM 3.0, it can provide more bill savings and potentially pay for itself if operated correctly. Adding a small battery can increase the bill offset to as much as 70%-90%, compared to a 55% bill offset for a system without a battery under NEM 3.0. So adding energy storage batteries with your solar panel system could lead to a quicker payback under the new NEM 3.0 billing model in CA.
http://solarnegotiators.com/blog/nem...-need-to-know/
https://www.energysage.com/blog/net-metering-3-0/
Under CA NEM 3.0, the payback period for solar systems with batteries may be quicker compared to systems without batteries. The NEM 3.0 policy has shifted from net metering to net billing, which significantly reduces the compensation rates for excess solar power sent to the grid. This change makes the inclusion of batteries more economically favorable, as they can store excess energy for use during peak demand times or when the sun isn’t shining, rather than sending it back to the grid at a lower credit rate. While a battery is not required under NEM 3.0, it can provide more bill savings and potentially pay for itself if operated correctly. Adding a small battery can increase the bill offset to as much as 70%-90%, compared to a 55% bill offset for a system without a battery under NEM 3.0. So adding energy storage batteries with your solar panel system could lead to a quicker payback under the new NEM 3.0 billing model in CA.
Last edited by wildta; Jun 8, 2024 at 06:46 PM.
Thread Starter
MBWorld Fanatic!
Joined: Oct 2010
Posts: 8,164
Likes: 4,383
From: Corona Del Mar, CA
2019 SL450, 2019 E450 Luxury Trim Wagon, 2024 BMW I7 xDrive60
Have you read about NEM 3.0?
http://solarnegotiators.com/blog/nem...-need-to-know/
https://www.energysage.com/blog/net-metering-3-0/
Under CA NEM 3.0, the payback period for solar systems with batteries may be quicker compared to systems without batteries. The NEM 3.0 policy has shifted from net metering to net billing, which significantly reduces the compensation rates for excess solar power sent to the grid. This change makes the inclusion of batteries more economically favorable, as they can store excess energy for use during peak demand times or when the sun isn’t shining, rather than sending it back to the grid at a lower credit rate. While a battery is not required under NEM 3.0, it can provide more bill savings and potentially pay for itself if operated correctly. Adding a small battery can increase the bill offset to as much as 70%-90%, compared to a 55% bill offset for a system without a battery under NEM 3.0. So adding energy storage batteries with your solar panel system could lead to a quicker payback under the new NEM 3.0 billing model in CA.
http://solarnegotiators.com/blog/nem...-need-to-know/
https://www.energysage.com/blog/net-metering-3-0/
Under CA NEM 3.0, the payback period for solar systems with batteries may be quicker compared to systems without batteries. The NEM 3.0 policy has shifted from net metering to net billing, which significantly reduces the compensation rates for excess solar power sent to the grid. This change makes the inclusion of batteries more economically favorable, as they can store excess energy for use during peak demand times or when the sun isn’t shining, rather than sending it back to the grid at a lower credit rate. While a battery is not required under NEM 3.0, it can provide more bill savings and potentially pay for itself if operated correctly. Adding a small battery can increase the bill offset to as much as 70%-90%, compared to a 55% bill offset for a system without a battery under NEM 3.0. So adding energy storage batteries with your solar panel system could lead to a quicker payback under the new NEM 3.0 billing model in CA.
Senior Member
Joined: Nov 2022
Posts: 318
Likes: 83
2022 Taycan GTS, 2023 EQS580 SUV, 2023 EQS580 sedan
from your location, you probably has same SCE as I do.
with nem1 or 2, you won't get too much back. the most I got is just 120 a year. most the time just $10~20 per year
here is my experience, just give you an idea, my SCE bill average is ~180. summer bill is about ~300-400 back to 2015
my 1st solar installed at 2016 and monthly payment 120 (after 30% tax credit), since then I only pay SCE monthly fee ~10 (now is 20)
don't think about charing your EV and power wall. on 2021, 2022, 2023 summer, all my friends without solar are paying ~700-800 a month during summer. I paid 120 solar +10 SCE fee only.
install solar will save you money in the long run. unless you don't use AC in summer.
now back to EV
last year I max out my roof with another 4.8kw panels, with 2 power wall (total 31400 before tax credit ~9.4k),
new loan is 388 before tax credit.
two EQS580 one using 17% a day another 10% a day, total 27% charged daily, current SCE monthly bill is 0 (20 fee).
with solar and EV
so now 0 gas fee, 20 SCE monthly, 120 1st solar loan, and 388 2nd solar loan = $528
vs.
without solar and no EV
average 180 sce bill, ~600 gas per mo = $880
ps. here is my solar cost 25700 (2016) + 31400 (2023)= 57100 - (8600+9430) tax credit = 39070
your question, when is the best time to charge with solar and power wall.
I will say the best time to charge is 8am-4pm. that way you dont need to import any electric from SCE because they charge delivery fee.
for me, M-F my wife leave the house ~ 6:20am, and I leave at 7:45am. her car will charge start at 4:30am, most the power wall will go to her car, my car charge after she left.
daily import about 7-13 kw depending AC running at night or not.
power wall will charge from solar and get full before 1pm on sunny day and start export extra power(15-25kw daily). my Tesla app setting is self power, and limited 15% of power wall reserve.
with nem1 or 2, you won't get too much back. the most I got is just 120 a year. most the time just $10~20 per year
here is my experience, just give you an idea, my SCE bill average is ~180. summer bill is about ~300-400 back to 2015
my 1st solar installed at 2016 and monthly payment 120 (after 30% tax credit), since then I only pay SCE monthly fee ~10 (now is 20)
don't think about charing your EV and power wall. on 2021, 2022, 2023 summer, all my friends without solar are paying ~700-800 a month during summer. I paid 120 solar +10 SCE fee only.
install solar will save you money in the long run. unless you don't use AC in summer.
now back to EV
last year I max out my roof with another 4.8kw panels, with 2 power wall (total 31400 before tax credit ~9.4k),
new loan is 388 before tax credit.
two EQS580 one using 17% a day another 10% a day, total 27% charged daily, current SCE monthly bill is 0 (20 fee).
with solar and EV
so now 0 gas fee, 20 SCE monthly, 120 1st solar loan, and 388 2nd solar loan = $528
vs.
without solar and no EV
average 180 sce bill, ~600 gas per mo = $880
ps. here is my solar cost 25700 (2016) + 31400 (2023)= 57100 - (8600+9430) tax credit = 39070
your question, when is the best time to charge with solar and power wall.
I will say the best time to charge is 8am-4pm. that way you dont need to import any electric from SCE because they charge delivery fee.
for me, M-F my wife leave the house ~ 6:20am, and I leave at 7:45am. her car will charge start at 4:30am, most the power wall will go to her car, my car charge after she left.
daily import about 7-13 kw depending AC running at night or not.
power wall will charge from solar and get full before 1pm on sunny day and start export extra power(15-25kw daily). my Tesla app setting is self power, and limited 15% of power wall reserve.
Last edited by guess2098; Jun 9, 2024 at 01:00 AM.
MBWorld Fanatic!
Joined: Oct 2021
Posts: 1,197
Likes: 636
From: Iowa
2008 CL550, 2022 EQB 300, 2023 EQS 450 4Matic
Yah, we've got two, and solar. I don't think this is an economical consideration for you...it is likely to be a bad financial decision. But, you will have peace of mind that you will always have power if the grid is interrupted for whatever reason. One doesn't have to be a doomsday prepper to be concerned that our country's rickety grid could potentially be out of service either from damage or cyber attack for a substantial amount of time.
MBWorld Fanatic!
Joined: Oct 2014
Posts: 4,524
Likes: 1,181
From: WI
17 E43; 21 GLS580
A powerwall module has 22kw. An EQS has a 120 kw battery.... Is it me, or does the math not add up? Furthermore, it can only provide a max of 6.6 kw continous. So, not only would it be impossible to charge the vehicle more than 20% a night, it would be pretty slow at that! Lastly it would leave no juice for anything else.
MBWorld Fanatic!
Joined: Oct 2021
Posts: 1,197
Likes: 636
From: Iowa
2008 CL550, 2022 EQB 300, 2023 EQS 450 4Matic
A powerwall module has 22kw. An EQS has a 120 kw battery.... Is it me, or does the math not add up? Furthermore, it can only provide a max of 6.6 kw continous. So, not only would it be impossible to charge the vehicle more than 20% a night, it would be pretty slow at that! Lastly it would leave no juice for anything else.
Trending Topics
Senior Member
Joined: Nov 2022
Posts: 318
Likes: 83
2022 Taycan GTS, 2023 EQS580 SUV, 2023 EQS580 sedan
A powerwall module has 22kw. An EQS has a 120 kw battery.... Is it me, or does the math not add up? Furthermore, it can only provide a max of 6.6 kw continous. So, not only would it be impossible to charge the vehicle more than 20% a night, it would be pretty slow at that! Lastly it would leave no juice for anything else.
powerwall+ provide max 9.6kw continuous, almost all the new order is using powerwall+, the new powerwall 3 provides 11.5kw
also you can still use over powerwall can provide, say I charge my car at 9.8kw, gateway will split to two input, 9.6kw will from power wall and 0.2 from grid.
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
MBWorld Fanatic!
Joined: Oct 2014
Posts: 4,524
Likes: 1,181
From: WI
17 E43; 21 GLS580
you dont use power wall for charing your EV! you use power wall to avoid peak time rate.
powerwall+ provide max 9.6kw continuous, almost all the new order is using powerwall+, the new powerwall 3 provides 11.5kw
also you can still use over powerwall can provide, say I charge my car at 9.8kw, gateway will split to two input, 9.6kw will from power wall and 0.2 from grid.
powerwall+ provide max 9.6kw continuous, almost all the new order is using powerwall+, the new powerwall 3 provides 11.5kw
also you can still use over powerwall can provide, say I charge my car at 9.8kw, gateway will split to two input, 9.6kw will from power wall and 0.2 from grid.
Senior Member
Joined: Nov 2022
Posts: 318
Likes: 83
2022 Taycan GTS, 2023 EQS580 SUV, 2023 EQS580 sedan
anyways, it takes about another 2 years 11 mo to recoup.
Thread Starter
MBWorld Fanatic!
Joined: Oct 2010
Posts: 8,164
Likes: 4,383
From: Corona Del Mar, CA
2019 SL450, 2019 E450 Luxury Trim Wagon, 2024 BMW I7 xDrive60
I appreciate all the comments, much of it blowing right over my head. As I said, I have a lot to learn on this subject. I believe we will put in at least one Powerwall, if for nothing more than as a backup when the grid goes down.
SPONSOR
Joined: Apr 2021
Posts: 1,570
Likes: 475
From: Scottsdale, Arizona
2001 E55AMG
Yah, we've got two, and solar. I don't think this is an economical consideration for you...it is likely to be a bad financial decision. But, you will have peace of mind that you will always have power if the grid is interrupted for whatever reason. One doesn't have to be a doomsday prepper to be concerned that our country's rickety grid could potentially be out of service either from damage or cyber attack for a substantial amount of time.
Trenton O. Gibson
tgibson@highline-autos.com
Highline Autos
Direct: 602.909.9216
Office: 480.348.0777
Member
Joined: Jan 2023
Posts: 178
Likes: 41
From: Irvine, CA
2023 EQS 580 4Matic SUV
I'm thinking about added 2 Tesla Powerwall to my current solar system but i don't see the benefits.
I'm on CA NEM 2.0. My 5-kwh systems cost $21,000. To add 2 Tesla Powerwall 3 Batteries will cost another $21,000 (including installation), that $42,000 total.
Before my PTO during the summer/winter my electric bill cost ~$300-$400 per month depend on if I charged at home every week or not. After my PTO, during October to March my solar make ~12-20-kwh per day that with the HVAC running and charging at home, my electric bill average ~$30-45 per month.
During April to September on a clear sunny day my solar make 31-kwh Max per day. With the AC set at 70 degrees, charging the EV every week and kids are on summer breaks and relative visiting. The electrical company (SCE) owned me money (credits). So, I don't pay anything to charge my EV at home. I still have a negative balance since April.
I pay $21,000 cash for my solar system. Assuming my electric bill average is ~$350/ month i would get my money back in 5 years ($21,000/$350/12 months=5 years).
Solar $21,000 plus $21,000 Batteries. $42,000, i would pay off the system in 10 years?? By the time i pay off the system the batteries would be out of warranty.
Adding Battery ($21,000) would not benefit me in the long run.
If you buy solar now, you'll be on NEM 3.0 and you going to get screwed by the electric companies.
I'm on CA NEM 2.0. My 5-kwh systems cost $21,000. To add 2 Tesla Powerwall 3 Batteries will cost another $21,000 (including installation), that $42,000 total.
Before my PTO during the summer/winter my electric bill cost ~$300-$400 per month depend on if I charged at home every week or not. After my PTO, during October to March my solar make ~12-20-kwh per day that with the HVAC running and charging at home, my electric bill average ~$30-45 per month.
During April to September on a clear sunny day my solar make 31-kwh Max per day. With the AC set at 70 degrees, charging the EV every week and kids are on summer breaks and relative visiting. The electrical company (SCE) owned me money (credits). So, I don't pay anything to charge my EV at home. I still have a negative balance since April.
I pay $21,000 cash for my solar system. Assuming my electric bill average is ~$350/ month i would get my money back in 5 years ($21,000/$350/12 months=5 years).
Solar $21,000 plus $21,000 Batteries. $42,000, i would pay off the system in 10 years?? By the time i pay off the system the batteries would be out of warranty.
Adding Battery ($21,000) would not benefit me in the long run.
If you buy solar now, you'll be on NEM 3.0 and you going to get screwed by the electric companies.
Senior Member
Joined: Nov 2022
Posts: 318
Likes: 83
2022 Taycan GTS, 2023 EQS580 SUV, 2023 EQS580 sedan
I am not sure adding powerwall will change nem2 to 3. check with SCE 1st? also powerwall has 30% tax credit, so it is not 21000, after tax return is 14700, but check with your CPA (I think tesla also give discount, you can check with Tesla too)
but you said you are charging your EV and still have credit in SCE after 12 billing cycle, I would suggest not to buy powerwall.
from Tesla website
I have solar installed and have received permission to operate (PTO) from my utility under NEM 1.0 or NEM 2.0. Can I add a Powerwall to my system and maintain my existing status?
but you said you are charging your EV and still have credit in SCE after 12 billing cycle, I would suggest not to buy powerwall.
from Tesla website
I have solar installed and have received permission to operate (PTO) from my utility under NEM 1.0 or NEM 2.0. Can I add a Powerwall to my system and maintain my existing status?
- Yes. The current policy would allow customers on NEM 1.0 and NEM 2.0 to add battery storage later. For existing NEM 1.0 and NEM 2.0 customers, adding battery storage does not affect your existing status. It is important to understand, however, that policies may change so this should not be taken as a guarantee of future policy.
I'm thinking about added 2 Tesla Powerwall to my current solar system but i don't see the benefits.
I'm on CA NEM 2.0. My 5-kwh systems cost $21,000. To add 2 Tesla Powerwall 3 Batteries will cost another $21,000 (including installation), that $42,000 total.
Before my PTO during the summer/winter my electric bill cost ~$300-$400 per month depend on if I charged at home every week or not. After my PTO, during October to March my solar make ~12-20-kwh per day that with the HVAC running and charging at home, my electric bill average ~$30-45 per month.
During April to September on a clear sunny day my solar make 31-kwh Max per day. With the AC set at 70 degrees, charging the EV every week and kids are on summer breaks and relative visiting. The electrical company (SCE) owned me money (credits). So, I don't pay anything to charge my EV at home. I still have a negative balance since April.
I pay $21,000 cash for my solar system. Assuming my electric bill average is ~$350/ month i would get my money back in 5 years ($21,000/$350/12 months=5 years).
Solar $21,000 plus $21,000 Batteries. $42,000, i would pay off the system in 10 years?? By the time i pay off the system the batteries would be out of warranty.
Adding Battery ($21,000) would not benefit me in the long run.
If you buy solar now, you'll be on NEM 3.0 and you going to get screwed by the electric companies.
I'm on CA NEM 2.0. My 5-kwh systems cost $21,000. To add 2 Tesla Powerwall 3 Batteries will cost another $21,000 (including installation), that $42,000 total.
Before my PTO during the summer/winter my electric bill cost ~$300-$400 per month depend on if I charged at home every week or not. After my PTO, during October to March my solar make ~12-20-kwh per day that with the HVAC running and charging at home, my electric bill average ~$30-45 per month.
During April to September on a clear sunny day my solar make 31-kwh Max per day. With the AC set at 70 degrees, charging the EV every week and kids are on summer breaks and relative visiting. The electrical company (SCE) owned me money (credits). So, I don't pay anything to charge my EV at home. I still have a negative balance since April.
I pay $21,000 cash for my solar system. Assuming my electric bill average is ~$350/ month i would get my money back in 5 years ($21,000/$350/12 months=5 years).
Solar $21,000 plus $21,000 Batteries. $42,000, i would pay off the system in 10 years?? By the time i pay off the system the batteries would be out of warranty.
Adding Battery ($21,000) would not benefit me in the long run.
If you buy solar now, you'll be on NEM 3.0 and you going to get screwed by the electric companies.
Last edited by guess2098; Jun 11, 2024 at 02:14 PM.
MBWorld Fanatic!
Joined: Jan 2023
Posts: 3,135
Likes: 1,205
GLE 580
Adding batteries to a grandfathered NEM 2.0 system does not change your NEM status. You can also add, I believe up to 10%, additional panels to a grandfathered system without forcing a change to NEM 3.0.
Super Member
Joined: Apr 2011
Posts: 684
Likes: 260
23' EQS AMG
I guess I'm still old school with my NG generator when it comes to backup power. We have the largest NG reserve in the world. While it is not cheap to use as backup electricity, it is just that . . . for backup. The infrastructure works in Texas cities. I've thought about battery power as backup, but I think it's only good enough to keep your food from spoilage in blackouts and maybe keep the LED lights on. Here in Texas, we need our HVAC most of the time in a year.
I'll wait until the battery power backup is more mature.
I'll wait until the battery power backup is more mature.
MBWorld Fanatic!
Joined: Oct 2021
Posts: 1,197
Likes: 636
From: Iowa
2008 CL550, 2022 EQB 300, 2023 EQS 450 4Matic
I guess I'm still old school with my NG generator when it comes to backup power. We have the largest NG reserve in the world. While it is not cheap to use as backup electricity, it is just that . . . for backup. The infrastructure works in Texas cities. I've thought about battery power as backup, but I think it's only good enough to keep your food from spoilage in blackouts and maybe keep the LED lights on. Here in Texas, we need our HVAC most of the time in a year.
I'll wait until the battery power backup is more mature.
I'll wait until the battery power backup is more mature.
Super Member
Joined: Jan 2022
Posts: 981
Likes: 555
I guess I'm still old school with my NG generator when it comes to backup power. We have the largest NG reserve in the world. While it is not cheap to use as backup electricity, it is just that . . . for backup. The infrastructure works in Texas cities. I've thought about battery power as backup, but I think it's only good enough to keep your food from spoilage in blackouts and maybe keep the LED lights on. Here in Texas, we need our HVAC most of the time in a year.
I'll wait until the battery power backup is more mature.
I'll wait until the battery power backup is more mature.
Newbie
Joined: Jul 2024
Posts: 5
Likes: 3
EQS450+
Old thread I know,
but we have both powerwalls + a Tesla wall charger. Fair warning… the EQS is NOT a fan of listening to the Tesla’s “do not charge when” schedule lol so make sure to use the one in the Mercedes app.
but we have both powerwalls + a Tesla wall charger. Fair warning… the EQS is NOT a fan of listening to the Tesla’s “do not charge when” schedule lol so make sure to use the one in the Mercedes app.
