Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register
  • We just completed a significant update, but we still have some fixes and adjustments to make, so please bear with us for the time being. Cheers!

New Cal fire code for Powerwalls?

Tam

Well-Known Member
Nov 25, 2012
8,261
7,114
Visalia, CA
... 3 feet from any wall...

Powerwall doesn't like for "wall" anymore!

The 3 foot clearance rule used to be for 250kWh but now it's for 20kWh and greater.

Sounds like it's ok to hang one 13.5kWh powerwall but as soon as we got more than 1, no more wall-hanging allowed!
 

NuShrike

Member
Nov 13, 2017
459
193
SoCal
Looks like they have to be put on pedestals in the backyard now, like the telephone boxes on the sidewalk.

I'm glad they're not making it retroactive.
 
  • Like
Reactions: wesley888

marksvend

Member
Sep 21, 2017
117
326
Issaquah, WA
The 608.1 scope for 20kWh systems doesn't require spacing away from walls. In 608.2.3, it says 50kWh systems require separation. So it doesn't seem like a big deal unless you have 4 or more Powerwalls. Right?
 

wwhitney

Member
Nov 2, 2017
748
905
Berkeley, CA
The 608.1 scope for 20kWh systems doesn't require spacing away from walls. In 608.2.3, it says 50kWh systems require separation. So it doesn't seem like a big deal unless you have 4 or more Powerwalls. Right?
608.2.3 says"Storage batteries . . . shall be segregated into stationary battery arrays not exceeding 50 kWh (180 Megajoules) each. Each stationary battery array shall be spaced a minimum 3 feet (914 mm) from other stationary battery arrays and from walls in the storage room or area."

So systems under 50 kWh are not exempted from 608.2.3. But systems under 20 kWh are exempt from 608 per 608.1.

If you have one Powerwall, it is clearly exempt. If you have two or more Powerwalls, you'd have to argue that each Powerwall is a separate system, or else comply with 608, including 608.2.3.

Cheers, Wayne
 

Ionpowr2

New Member
Jun 2, 2019
3
1
San Francisco
Our solar contractor in SF informed us August 27th that there is now a new permit process being implemented which will be much more rigorous than the previous plan check process. Reportedly has affected existing permits in addition to our new one for a 2 Powerwall system. They've advised reducing to a single Powerwall until they get more direction from SF DBI.
 

SF Contractor

New Member
Oct 7, 2019
2
9
San Francisco
Has anyone hit the new fire code requirements when designing or permitting a Powerwall in CA. The new rules seem pretty onerous, especially the one about the powerwalls needing to be, er, 3 feet from any wall:

Challenges for batteries in the California fire code


I just had a system installed for a client in San Francisco. When the installer called for a final inspection the Department of Building Inspection revoked the permit ( never before in twenty years working in San Francisco) and said they were retroactively moving to the new code and would not allow the installation of our double power wall system. We are in a 1 hour enclosure garage with no sprinklers. Now we have two dead batteries hanging on the wall that can’t be used. I am hoping one of the rocket scientists at Tesla can do the same magic they do with their cars, Turn our two 13KWH walls into two 9.9KWH walls thus keeping us under the 20 KWH threshold and allowing us to exceed the 30 amp per wall circuit limit. Please feel free to contact me with any suggestions
 

Attachments

  • 34869656-0EEC-499A-ACFF-E583B74DAA85.jpeg
    34869656-0EEC-499A-ACFF-E583B74DAA85.jpeg
    376.9 KB · Views: 118

power.saver

Supporting Member
Mar 4, 2018
496
496
Arcadia, CA
I find it hard to understand the purpose of these new rules. If two 13kWh powerwalls installed in a garage less than 3' from the wall and less than 10' from the entry are in violation, how is it that you can park two EVs with 100kWh batteries in the same garage, less than 3' apart and less than 3' from the wall? Granted, EVs aren't stationary, but isn't the perceived hazard greater? Will EVs be forced to park on the street next?
 

bmah

Moderator, Model S/X, California Forums
Mar 17, 2015
3,837
6,795
Lafayette, CA, USA
I find it hard to understand the purpose of these new rules. If two 13kWh powerwalls installed in a garage less than 3' from the wall and less than 10' from the entry are in violation, how is it that you can park two EVs with 100kWh batteries in the same garage, less than 3' apart and less than 3' from the wall? Granted, EVs aren't stationary, but isn't the perceived hazard greater? Will EVs be forced to park on the street next?

Shhh...don't give anyone ideas. :eek:

Bruce.
 

jkoya

NA2 NSX
Nov 21, 2018
3,626
1,553
Northern CA
Wow - I'm glad I found this thread. Was going to start the Powerwall process soon, but it wouldn't be completed before the end of the year. Might have to drop down to just one powerwall....
 

KSilver2000

Active Member
Dec 23, 2017
1,368
1,953
CA
My generator is enough to run a fridge and charge a few phones. That is enough for me. After all, have not used it in a decade, at our last power outage which I think lasted 2 hours or less.

And I know that solar is required after 2020, but how does the new CA building codes effect installing a powerwall?

I think you know, but just to clarify in case others get the wrong idea, solar is required only for new residential builds. And it’s not even a requirement for the panels to be on the roof. As long as some of the energy pulled into the home comes from solar, regardless of whether it’s from an HOA community solar farm, or a solar farm 100 miles away, it meets requirement.

Regarding the building code for batteries, interpretation of the new code shows installing one battery on the wall is fine.
But, with more than one battery installed inside, there has to be at least 3 feet separation from each battery, walls of the garage/home, and other equipment. There goes that second car space in the garage. 4-inch diameter steel bollards, no less than 3 feet tall, to protect against vehicle impact.

Exterior placements require it to be on a pedestal, and minimum 5 feet from lot lines and public ways. 10 feet minimum from any means of egress from a nearby building. Must be secured from unauthorized access such as with fencing all around.

But, it’s said that some of these requirements can be exempt by local jurisdiction. So, nothing concrete, and no definitive guidelines yet from any city that I know of. Although, some people in San Francisco has already run into trouble with 2 PWs mounted traditionally on the wall (installer had no idea of changed rules).
 

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top