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Powerwall 2 Available Energy After 2 Years

aesculus

Still Trying to Figure This All Out
May 31, 2015
4,532
2,601
Northern California
I recently worked with a neighbor who had his 2 PW system installed about 6 months before mine in April 2019. I showed him how to access the system status. Both of his PW's were showing capacity in the 13's. My 2 PW's are in the 10's as of today. I agree with you that there is no way my PW's had 13.5 at the start if someone with the same climate conditions is seeing no degradation. Unfortunately, I have no way to prove it.
I hate to be the bearer of bad news like your friend is, but my two PWs installed on 1/2/20 are still in the solid 13's with nominal_full_pack_energy: 26963
 
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kairojya

Member
Jun 30, 2021
90
77
Tampa, FL
I noticed earlier this month that my nominal_full_pack_energy increased by 690 wH after a firmware update (21.24.1). I had been steadily getting 13724 from my PW+ and 13630 from my PW2 (27354 total). Then 10 minutes later, after the system had restarted due to the firmware update, I get 14069 from the PW+ and 13973 from the PW2 (28042). I haven’t been monitoring this closely enough to know if this is normal behavior after just the restart, and unrelated to the firmware update. It seems like the system does a different calculation upon system start than it does while running.
 

bmah

Moderator
Supporting Member
Mar 17, 2015
4,268
8,087
Lafayette, CA, USA
Congratulations to those of you who have gobs and gobs of your original energy storage remaining. ;)

I hope this doesn't turn into the Powerwall equivalent of "batterygate".

Bruce.
 
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zƬesla

Member
Apr 16, 2020
425
161
US-NH
How old are these?

I'm at 40972 for 3 (13732, 13640, 13606). 2 are just over a year old and the other < 6 months.

A month later, I am now somehow at 41752 (13942, 13842, 13968), almost 1kW more.

Guess battery seasoning is a thing, or latest firmware is scrambling the numbers.
 

solardudesf

Member
Jul 24, 2019
64
10
San Francisco, CA
I'm not saying that the reported numbers are being scaled; that presupposes some starting scale. I'm just saying that since it is called "nominal", I would expect a new PW to report "nominal_full_pack_energy" to be 14,000 not 13,500. And I would expect that a fully depleted Powerwall would report around 500 for "nominal_energy_remaining" (or maybe it's a bit more). [Someone should get the data.] That would be the 13.5 kWh usable advertised on the spec sheet.

In which case, the actionable level for the 70% warranty would be a "nominal_full_pack_energy" of 500 + 70% * 13,500 = 9,950.

Cheers, Wayne

I agree with how you are thinking it should be. Unfortunately looks like there is a footnote on the warranty document.
“1. Expressed as a % of 13.5 kWh rated capacity.“
 

SMAlset

Well-Known Member
Mar 4, 2017
9,208
10,075
SF Bay Area
After reading through this thread we checked our nominal full pack energy after having PTO end Oct. 2020, so not quite 1 year yet. 3PWs, one was swapped out in 3/2021 as the cover was damaged during install and guess with the shortage of PW units last year and first quarter this year took that long for low priority replacement (orig unit worked fine). Told we were getting a new one and not a refurb and appears to be the case. All 3 are PW2s, not PW2+. Readings are as follows: 40,554 (13,326, 13,401 and 13,827).
 

Vostok

Active Member
Jul 1, 2017
1,677
1,788
Sydney
FWIW, my PW2 is 29 months old and 'total_pack_energy' shows as 10378 or 76.9%. If it started at 100% and the decline is linear, it would go below 70% in June next year - so barely 3 years.

My PW is installed outside on a north-facing wall (not ideal, since I'm in the southern hemisphere) because that was the only place it could be installed. But it has a wide awning above it that mostly keeps it in the shade.
 

BGbreeder

Member
Jun 19, 2020
443
259
Bay Area
FWIW, my PW2 is 29 months old and 'total_pack_energy' shows as 10378 or 76.9%. If it started at 100% and the decline is linear, it would go below 70% in June next year - so barely 3 years.

My PW is installed outside on a north-facing wall (not ideal, since I'm in the southern hemisphere) because that was the only place it could be installed. But it has a wide awning above it that mostly keeps it in the shade.
Sorry to hear that.

Would the good news be that you will get a new one relatively soon?

All the best,

BG
 

gpez

Member
Apr 25, 2019
737
606
USA
Just got "upgraded" to 21.35.0 last night and now "nominal_full_pack_energy":12028, up from 11901 in July. Possible it's the new firmware, possible it's because the weather is substantially cooler (and more battery friendly).
 

KyleDay

Active Member
Oct 29, 2016
1,379
3,115
AZ
I just took a look at my PW2s which have been in use now for 9 months in Arizona (inside my hot garage). no degradation at all and I use them daily, deep discharges.
Strange that I have no degradation whatsoever. Nominal Energy Remaining AND nominal full pack for both PW2 units report identical at 13516 and 13523 for each PW2.

"nominal_energy_remaining":13516,"nominal_full_pack_energy":13516,

"nominal_energy_remaining":13523,"nominal_full_pack_energy":13523
 

GJones

Member
Apr 20, 2021
36
35
Napa, California
2 Powerwalls installed (outside) April 2019. Nominal energy one-10457, two-10536, 20993 combined. The new firmware did not change those numbers at all. Tracking this via this method for only 4 months and it has gone down 0.3% over that time period. Tracked using an estimate based on discharge kWHrs over a longer period gives a similar number. Most of my loss occurred during the first year of operation. Mine cycle about 25% to 100% of capacity on a daily basis using the time based control and a PG&E EV rate schedule.
 

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