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Existing Powerwall 2s to get 50% power capacity increase with SW update?

sorka

Well-Known Member
Feb 28, 2015
8,243
6,017
Merced, CA
Did anyone see Tesla's announcement that existing PW2s will get a capacity increase of up to 50% depending on production date?


Anyone have any idea what "recent" means? How can you tell when your powerwalls were made? Also for ones the 50% increase, I guess that means the current SOC debth of use at 100% is only 66.6% with the rest hidden either at the top or bottom.
 

sorka

Well-Known Member
Feb 28, 2015
8,243
6,017
Merced, CA

Vines

Active Member
Jul 20, 2018
2,046
2,373
Silicon Valley, CA
I saw and am tracking this but still confused.

Existing Powerwall 2 AC systems already max out the 30A breaker, I do not understand how more power is allowed unless its from EDIT apparent power.

Currently the units can sustain 5000w (20.8A at 240V), however they are determined to have a maximum apparent output of 5800w (24A at 240V)

Multiply this 24A by the NEC required 1.25 and you have a 30A breaker and wire requirement.

It might be this really applies only to Powerwall 2.1. That seems most likely.

Otherwise there is some intention to raise output to 5800w, or they are thinking replacing breakers. I suspect the former.
 
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ucmndd

Well-Known Member
Mar 10, 2016
6,910
13,051
California
still, what does it mean and does anyone have yet?
A current Powerwall 2 is rated to provide 5kw continuous and 7kw peak power.

If Elon is to be believed, Tesla believes they can increase one or both of these numbers by up to 50% without having a significant negative effect on the lifetime of the batteries. Basically this means you can power "more stuff" from a single Powerwall, but the overall amount of energy is still the same (so they will drain faster).
 
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sorka

Well-Known Member
Feb 28, 2015
8,243
6,017
Merced, CA
The way the articles are written say 50% increase from software update. That would be 7500 continuous which would require moving from a 30 amp to 40 amp breaker and increasing the wire sizing from the PWs to the breakers.

This is is why when I glossed over it originally I thought it meant 50% capacity increase as storage capacity and just figured they were unlocking the stormwatch capacity to be visible and usable without storm watch engaged.
 

daveh85

Member
Aug 6, 2020
34
54
Cohasset, MA
I’m pretty confident but will check, I actually pointed it out as the breaker size was different to the “as design” but the local inspector didn’t care. They used copper #8 THWN which is good for 50amp.
 

Dave EV

Active Member
Jun 23, 2009
1,864
1,449
San Diego
I’m pretty confident but will check, I actually pointed it out as the breaker size was different to the “as design” but the local inspector didn’t care. They used copper #8 THWN which is good for 50amp.
It's been 50 minutes and you haven't come back from checking yet. Are you OK? Do we need to send out a rescue crew? People are waiting! :)
 

holeydonut

Supporting Member
Supporting Member
Jun 27, 2020
2,110
1,495
East Bay NorCal


FWIW, PG&E also views battery capacity as kW export size rather than kWh storage. It's a weird thing that confused me during the SGIP process. The thing that SGIP and these fancy battery folks use that most closely approximates to what you're talking about is the "duration" of peak discharge the batteries are capable of.

So my 3x Powerwalls have 39.6 kWh max storage and can export 15 kW at max (before the software update). SGIP considers this battery to be a 2.64 hour battery system and "sized" the SGIP to 2.64.

Weirdly, if the export per PW goes up to 7 kW, then the same battery system would become a sub-2-hour system because the total export is 21 kW.

And per SGIP rules, the incentive for the sub-2-hour system is actually higher than the 2.64 hour system. Because to PG&E, the size of the battery has "increased".
 
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CrazyRabbit

Member
Apr 21, 2020
442
138
Fort Worth TX
elon tweets more power.jpg


I doubt engineering will approve this, would require your panels to be rewired!
 

gpez

Member
Apr 25, 2019
722
589
USA
Maybe not if they can configure peak max and steady max separately. I have a single Powerwall on a 30a breaker, could easily go to 6kw steady and not risk anything.
 

zanary

Active Member
Jan 25, 2017
1,455
1,612
SF Bay Area (East Bay), CA
Some of the most recent Powerwall 2.1 installs are being setup with a 50amp breaker instead of the 30 amp for Powerwall 2.0. A few people online are inferring that his tweet is for the new Powerwall 2.1 where it is being setup with the new 50 amp...
 
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