400A gateway anytime soon?

400A gateway anytime soon?

I am trying to install a whole home power wall back up. I have 2, 200 Amp electrical panels that run my house. I am being told that I can not run multiple gateways due to local code so I am forced to back up only one of my electric panels (Portland OR, USA)

Does anyone have any info on a 400A gateway becoming available any time soon?

Claudedohrn | 21 octobre 2018

Also interested. Similar situation, and I won’t do trenching if only 200A gateway.

Patrick | 24 octobre 2018

I’m suspicious of any “local code” that would prevent using two gateways, not sure why that would be the case. Suggest verifying this info again. Please share findings.

BearHeart | 11 novembre 2018

I have the same situation (2 x 200A panels) was told that it was a technical limitation that prevents using multiple gateways.

Nwshoeguy | 29 décembre 2018

It appears that it is not a local code but a Tesla Powerwall system limitation. Hope they make a change to the gateway soon. Does anyone have any updated information on a 400A gateway?

dgellman | 8 janvier 2019

I have the same problem i have spoken to many people at Tesla and no one has any definitive answer. So I guess as of now we have to wait.

ir | 9 janvier 2019

Count me in as interested. 2 panels with 2 gateways would mean 2 different sets of batteries that can’t balance load across the 2 branches. Hardly a cost effective nor desirable setup.

dgellman | 13 janvier 2019

maybe if we can get enough people to call/email in about a 400 amp gateway Tesla will get moving on one.

fdelzingaro | 16 janvier 2019

I just talked to the lead powerwall sales rep in NV. He said "no forseable future" on the 400 amp gateway.

steve0 | 18 janvier 2019

DISCLAIMER: I am not an electrician

So, for those that have 2x 200 AMP panels, does your house really have that many electrical runs and load requirement to justify both (and a 400A feed to the utility)? Also, have you had Telsa come out and do a site survey?

The reason I ask is because I currently have a 200A Main with a 100A sub-panel that is adequate sizing for my home (nearly 5k sqft + EV charger). I am having Tesla install a 20.79 kW PV array (19 kW AC nameplate) with full battery backup (3x powerwalls) and the utility stipulates that any PV system over 15 kW AC needs a 400A main, so I'm having the main upgraded as well. But in reviewing the electrical diagram, Tesla is only connecting one leg (200A) of the upgraded main when doing the install, so the other 200A leg in the main will be empty.

Just curious if you had a side visit and if the tech would modify your setup to run off a single 200A leg, so you wouldn't need a second gateway. Again, I am not an electrician so this may all be a laughable matter to someone in the know... Just a thought.

Patrick | 20 janvier 2019

I'm getting back into planning mode for a new solar PV generator with multiple PW2s for a new home. The home is not that large, but like our current home it will likely have to support heavier than average electrical loads due to multiple HVAC units, multiple EV charger connections, hot tub, and a few other high power items.

At first I thought a 200A utility service would suffice, but now I'm thinking we'll need at least 300A to make sure we're not coming back later for any major rework of the main electrical panels. After reviewing this thread and the PW2 installation guide, it looks like we'll have to deal with the 200A gateway limitation as well.

My questions related to available best practices and/or workarounds given the 200A limitation:

- Has anyone else already installed PW2s and a backup gateway with something greater than 200A utility service?

- If so, how did you work around the 200A gateway limitation?

- I'm assuming one way to handle this is to segment a 300-400A utility service entrance into two main breaker panels of 200A each in the home, and to allocate the loads that need battery backup into only one of those panels, kind of like the "essential loads" configuration example shown here:

Using that approach seems like it might complicate the solar PV connections needed to power the whole home, and we wouldn't really get the "whole-house" backup we desire in this situation, right?

- Any other creative ideas out there?

@steve0 - I have quite a bit of residential electrical experience - rest assured than many larger homes really do need 300-400A electrical service.

Patrick | 26 janvier 2019

Quick update on the 400A gateway - just spoke with a Tesla installer handling a new PV/PW2 project at a nearby home. He says the 400A gateway is a high demand item that will be available later on this year.

We’ll see what happens. FWIW he was very credible.

george | 28 janvier 2019

I have 400A service coming into the mail panel of my home. That panel is now forwarded to the input breaker ahead of the gateway. The gateway is limited to 200A, so it forwards to 200A to a new circuit breaker panel which now contains all breakers moved over to back them up and a 200A breaker that feeds the secondary 200A panel upstairs. Net-Net we can only deliver 200A to our home, but that’s plent for our needs and works great.

zubinanary | 31 janvier 2019
Patrick | 31 janvier 2019

@zubin - thanks for sharing the links. This is the first I've seen of a V2 backup gateway, interesting. The link is an Australian site, correct? Are they installing this version of the gateway there?

The one I saw being installed just last week in Florida was V1, wondering if V2 is available here in the US?

The specs don't seem to mention a max current rating, i.e. 200 vs. 400A...

zubinanary | 31 janvier 2019

I questioned Tesla Energy a few weeks ago about paying for an upgrade from my v1 to the new v2 gateway, and she said they haven't started to push them out to their US customer yet. I asked her about the difference, and the only thing she could say is that it was more about esthetics. Internal antennas and it is to look like a Powerwall itself vs. just a sub panel box.

I can't even find anything on the Tesla US site. I guess it's coming soon, but no idea if it's the new 400 amp or not.

TomC1776 | 23 juillet 2019

Any rumors on when and if the 400 amp gateway will be available? Seems like there is plenty of demand.

Patrick | 26 juillet 2019

We just confirmed the need for 400A service to power our new home project and the meter base will be installed soon. Running out of time to wait for a 400A gateway solution and no response yet to our Tesla PW2 order placed 5-6 months ago.

Looks like Tesla May lose this project to a competitive solution, but to keep our options open as long as possible and deal with a separate local utility issue related to “dual metering” vs normal “net” metering, we’ve developed a custom 240 VAC service wiring plan and “zero export” solar generator design. Part of this plan includes using two 200A main breaker panels, which enables max solution flex but requires preparing for the disappointing reality that we may have to segment our home loads across the two breaker panels and use the Powerwall array to create a micro grid that only runs loads connected to a single panel.

Still working on all this and happy to share our learnings if anyone else is in the same boat.

ir | 26 juillet 2019

“Looks like Tesla May lose this project to a competitive solution”

What competitive solution are you considering for residential battery storage that sports a single 400A gateway? I’ll be approaching the same conundrum soon for my project.

So far, the best we could come up with is to put the EV charging on a separate 200A circuit outside of solar & battery coverage. If there are single 400A gateway solutions out there, I too would like to consider them.

DermMD | 26 juillet 2019

Not an electrician but I did wire a gas generator backup to my house with two 200A panels. For that set up I installed two separate gateways but one only needs a single meter. The split the income utility was after the meter. To solve this problem I'd split the circuits after the Gateway not the meter. Hence a single Tesla or other gateway. Therefore one bundle from the meter to the gateway. Two bundles from the gateway to the two panels in the house. The incoming would still be 200A per bundle. Not that I can think of any home setup that requires 400A. I had 2 panels in that house because of an addition which required additional circuits with the original panel being full.

Patrick | 26 juillet 2019

Ir - to clarify - we have not been able to find anyone offering a single 400A whole-house backup gateway solution that performs like the Tesla gateway. Have looked at the integrated DC-coupled PIKA islanding inverters and Harbor battery arrays (also uses Panasonic battery modules) but their pricing is high and their batteries are not designed for full daily charging/discharging cycles like the PW2s.

Still shopping but running out of time. To grab the 30% federal ITC while available in 2019 the system we select must be online by 12/31. If Tesla can’t deliver and activate PW2s in that timeframe we may have no choice but to select a competitor.

Patrick | 26 juillet 2019

DermMD - what we have in mind so far (if Tesla will engage soon) is something more similar to what you’ve described. In our case we are planning for a 400A meter base outside, a 400A service cable from meter base to the electrical room inside, which is then split into two 200A sub-feeds.

One 200A feed hits the Tesla gateway, PW2 array and first main breaker panel, creating the primary home micro-grid running as many loads as possible and getting as close to a whole house self-powered solution as possible. The second 200A feed hits the second main breaker panel, which either a) loses power when the grid fails, or b) switches its loads over to the primary microgrid (connected behind the Tesla gateway) via an ATS during grid failures.

Complicating matters further is this fact - in order for all this to work in a dual-metering utility environment the inverter(s) have to support zero-export configurations.

It’s like Excedrin headache number 435 trying to figure out the best solution given the complications....

DermMD | 30 juillet 2019

@Patrick the setup I discussed above for my old house was for a Generac generator. You may get some ideas by studying the different ATS and gateway wiring diagrams they have on their website. In my case the generator was wired to only one ATS but the wiring was such that the two ATS were master and slave so that when utility power went out the whole house was still powered by the generator through the two panels.

TomC1776 | 4 août 2019

I feel myself sliding into a Rube Goldberg world. I hope Tesla will save us but I, like many of you, am running out of time. This fix would open up a significant market for Tesla. Please please please!

polly.creker | 9 août 2019

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Patrick | 16 août 2019

Thanks DermMD. I’m having trouble finding wiring diagrams on the Generac site. Do you by chance still have a link or diagram of your setup to share here or privately?

DermMD | 16 août 2019

Look at the manuals page and downloads. I just went through a few just now and I can't remember the model of the transfer switches I had but I couldn't find it. if you look through the different switch wiring diagrams you will find what I was referring to. I'd probably just call Generac technical support and ask them to point you in the right direction.

Patrick | 17 août 2019

Thank you!

Patrick | 7 septembre 2019

Received some good news on this topic last week. A reputable local dealer told us that Tesla recently released new PW/gateway software which now allows TWO active energy gateways (200A each) per installation instead of only a single gateway. If true the problem is solved for many like us!

Two 200A main breaker panels + two 200A gateways = 400A total home load capacity = a fully self-powered home, no more capacity concerns, a full whole-house backup solution, and no more disturbance in The Force!

We’ll see what happens. If true, our system with this configuration and 3 PW2s may come online in December. Fingers crossed....

gregbrew | 7 septembre 2019

So, still no solution if you have a single 400A main panel...rare now, but they'll become more common in new residential developments, when solar and EVs are considered a part of the mix. 25kW home DCFC is impractical currently, even with a 200A main panel.

Patrick | 7 septembre 2019

Not aware of a solution for a single 400A panel already in place. In our case we have new construction and were able to spec two separate 200A panels.

Patrick | 7 septembre 2019

For clarity in case it helps others planning for new projects - we specified one large 400A meter base which then feeds two 200A panels.