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I have about 15KW of Solar and 3 Power Walls and have been on the old E-6 plan. PG&E is eliminating E-6 and wants me to choose a new plan and says they will select E-TOU-C if I do nothing. When I look at the E-TOU-E versus E-TOU-D, its not obvious with a model which is better. Summer time and...

My Power Wall was installed before Tesla required combined their solar and Power walls. I have 3 Power Walls that have run and worked normally for about 3 years. Yesterday I say it went offline and all the App provides is Scan my code ( with what and why is not explained) or enter my TSN and...

Thanks. I think I've got balanced mode doing what I want by setting my E6 TOU times and adjusting my reserve to 65%. Each morning as my solar begins to come up, it is able to fully charge my PWs before 1PM and then at 1PM ( peak start) it begins back feeding PG&E fully. Then as solar and peak...

Makes sense. Since Tesla handled everything on the PW addition, they applied for the permit and wouldn't they have applied for the PW PTO? I would think they would arrange for the PW permission to operate. PG&E came out and disconnected the mains for my main panel upgrade and returned and they...

Agreed!. So I'm trying to tap into the knowledge here so as to better understand what is "best" for me and how to operate in the way best for me. Its complicated. I'm surprised Tesla hasn't built a modeling program. With just this one thread I've learned about a number of things that might...

Thanks. Good to know E6 is changing sooner. That should make it easier since solar production maximum and peak rates no longer overlap. The tricky part is knowing if my expectations are being met. It takes a bit of effort to go over every statement to know if you are doing ok. And those are...

I also missed the PSPS by about 5 miles. Lucky! It seems like playing around and really knowing what is happening is tough as for years I tried to go over the monthly bills but there is so much variation in situation that I gave up and waited for my true-up. Waiting a year doesn't work too...

Does the backup reserve apply to advanced mode? It would seem setting the backup reserve to a higher number would prevent using power wall discharge overnight when rates are low. Why waste power wall charge when rates are the lowest overnight when I just need to use valuable peak solar to...

Thanks. My very first thinking ( without to much detailed analysis) is I'm not going to make any additional money on the power walls since my summer peak ( when I get the most credit ) is from 1-7PM ( on E6) is when my solar was pumping its maximum power into the grid and getting top credit. If...

Well my nightmare continued for a while. The sub-contractor Tesla hired took a few months more but they did a nice install but Tesla wanted to finish the solar hookup - seemed silly! I had dug a trench making it trivial to run around my old panel pole a directly to the generation panel. The sub...

Thanks. What is NEM 1.0 vs 2.0? What is a PTO application? I installed my solar in 2008 and added more in 2012. If the PTO is the application to PG&E for interconnect, my addition was under a building permit but I didn't think to advise PG&E. My situation is slightly more complicated as I'm...

I've just had my new 3 Power Wall 2's turned up with my existing 16KW of solar and I've begun playing with the modes. I'm wondering if anyone has done an analysis and knows pros and cons of Self Powering versus trying to optimize TOU ( PG&E E6 ) using the advanced Time Based Control. I was also...

Looks like I was wrong about the Tesla contractor. Now my 3 PW system is delayed once again. No date given. Tesla Energy SUCKS!

I know a third party installer would do better. Tesla sent one team with one of their electricians and he had a mental plan that included my existing main panel and they put in the PWs and panels in my photo, then a second team came to "finish" it without knowing what "it" is. They second...

Its now been a month and my 3 Powerwalls and all 4 panels are just sitting there not yet wired. I struggled through the crazy billing and Tesla had a local contractor contact me to sort out their mess. They just could not figure out how to get the wiring to work out. I spoke to the local...

I don't really expect Tesla to eat the whole $4800 but rather to consider their errors bungling problems and my wasted time and re-quote as one job - not just bump it by MSRP. There is no way it costs $10,100 for this work and equipment based on what I've seen over 2 days. They did the complete...

Thanks this really helps. In my case all of the feeder wires that come up the conduits below are being intercepted before they reach the panel, spliced and sent back over to the backed up or non backed up new panels. That means there will be no feeder wires in the right half of my panel. The 4...

My main panel is a Square D SC2040M200C SC2040M200C : SC2040M200C_DATASHEET | Schneider Electric This panel costs $149 at Lowes https://www.lowes.com/pd/Square-D-200-Amp-20-Spaces-40-Circuit-Main-Breaker-Meter-Combo-Load-Center/1006521 Here is a photo of it showing the 200A main breakers in...

I'd like advice on how to handle on my installation billing surprise which is due to Tesla's incompetence and just plain carelessness in planning my Power Wall installation. I'm struggling with problems from Tesla with the their design and installation of 3 Power Walls into my existing 15KW...

I live in Northern CA where my power has been shutoff and I've been evacuated for fires twice. I have been waiting for months, delayed by Virus, for Tesla to submit my 3 Powerwall system to the Sonoma County building department so I can be scheduled. I already already have 17KW of solar. In...

It appears as you say there are off the shelf commercial chargers and balance modules that should work fine. No point re-inventing the wheel. It appears I should be able to build a simplified prototype after my PW2's are installed and see if they complain. I'll focus on the Raspberry Pi...

It would be nice to find a 6s commercial charger but this one has an inadequate discharge current at 5A and the balancing is limited to 2.2A per cell so it won't work in this application. Good idea though. The Tesla Model S battery is a 74p6s configuration and the 74 cells in parallel would...

Its not difficult to implement the BMS functions except balancing the cells by just controlling charging, discharge and a temperature monitor. It may not need balancing except initially and it would be easy to monitor the cells using the A/D and a 6:1 analog selector. Then it can be reported. If...

The system can perform in two modes: "Grid Power On " - power arbitrage and "Grid Power Off" PW2 extension. Arbitrage simply charges during high solar time and discharges in the evening when the new tariffs at PG&E will be after solar time. So the system will move the abundant non-peak solar...

I posted this in the thread I began but since this thread was similar, I thought I would post the same thing here to get any ideas from the people here. I wanted to share a diagram of the concept example I was investigating to see if I could get ideas and feedback. The main purpose is to add...

I wanted to share a diagram of the concept example I was investigating to see if I could get ideas and feedback. The main purpose is to add additional backup on top of the PW2 to help ride out cloudy days while in backup and perform time shifting of solar production. My understanding is the PW2...

I have both layout and electrical issues that concern me. The layout is "is there enough room when 3 PW2s are stacked?" and "where is the 36" measured from?" I've spoken with two designers at Tesla but since then I have run into additional questions. My layout thinking is stacking 3 PW2s sitting...

Thanks, the photo of 3 helps.

The limited discussions with Tesla suggested the 3 PW2s could be stacked back to back and mounted on the concrete slab. So the weight rests on the concrete and the wall is not carrying their weight and most of the space can be used by the Gateway and panels required. I am concerned that even in...

I sold my Leaf and am thinking about another. I have not decided. My girlfriend has a Volt which charges on my system. I don't like the idea of using an EV unless the manufacturer provides the capability via the charger system. How do you do it? How much power do you utilize from a Volt? My...

The two issues are related...

There is no technical reason the maximum charge rate is tied to the discharge rate. Discharge is the inverter power and should be limited by the heat dissipated by the PW2 inverter driving the home. That is why they say 7KW for 10 seconds as its not a hard limit. Its a heat thing. But when the...

I'm exploring designing a battery system to install in my garage that can soak up excess solar production while on backup and then discharge it at night reducing the PW2 discharge. I'm trying to investigate the issues that are being discussed in this post since the system I want to build might...

My interest is based on backup capacity. I'm aware even the PW2s won't be cost effective for non backup use. I'm more concerned about riding out cloudy weather while the power is off. My tradeoff is versus a generator such as propane. But any fuel will run out and needs maintenance. I had 2 4...

I'm having a 3 PW2 system installed but my summer solar generation ( about 16KW) capacity greatly exceeds the 3 x 14.5 KW = 43.5 KWHr storage capacity of the 3 PW2s. Before jumping into the 3 PW2 cost, I reviewed the possibility of doing a DIY system Building my own pseudo(Powerwall) based on...

I'm midstream in the process of having Power Walls installed onto my existing 17KW solar system. I'm hung up in the design process and have encountered the bad internal Tesla communication between customer service, engineering and operations ( installation). I originally asked for 3 PW2...

Sigineer provides a diagram for the "Charger mode" and "Discharger mode". Charging the batteries from AC from the GT inverters would imply it actually behaves in a mixed mode? In the case of backup when AC has failed and Main Relay 01 is opened, the Sigineer inverter provides AC derived from...

I thought I would share some info on the Orion BMS by Ewert Energy Systems because it provides some insight into the Tesla Model S battery system and its BMS monitoring boards. I was not aware the per module boards only provide monitoring of voltage and temperature and cell taps for balancing...

Were you able to assemble a block diagram or even a schematic of the Sigineer inverter so you could verify all these capabilities before building a system. A lot of these things are subtle and not well described by the data sheet. Or were you able to speak with them to develop your understanding...

Now take the Sigineer architecture where the grid is off and the S inverter switches to battery input. It would be running the home off its 12/16KW output. But in the case where there is excess solar GT power, how does the S inverter know it could let the home run off the GT inverters so it can...

So that implies in backup mode with no grid and the solar GT inverters are not producing enough power to run the house, the PW2 inverter must supplement them AND cannot ever charge its batteries while this case occurs. The only case where in backup that the PW2 might be able to charge its...

The Powerwalls will balance the 120V on split phase when running isolated from the grid, even if the generation from grid tied inverters has no neutral or carries no current on the neutral. The Enphase documentation clearly says the output is 208/240V. The Neutral might only be used for PLC...

My SMA SB7000US has a neutral. I had developed this concern regarding the Enphase M215 but the manual suggests split phase with neutral. If it was true that the M215 or other GTIs did not support 240 split phase 120V/N/120V, it would not be possible for Powerwall applications to allow the GTI...

I watched a few of Jack's videos and studied the Sigineer 12/15 KW and now have a much better understanding of most everything. I've answered most of my questions from the earlier post. I've determined both my SMA and Enphase inverters are 120V/120V split phase and yes they both support L1, L2...

Thanks for helping me work up to a full understanding. I am an electrical engineer and computer science graduate who spent my career in Telecom circuit, software, system and finally did 2 Telecom fiber/local Telco access startup company engineering and strategy. It’s been 25 years since I...

This is just a stream of conscious and not a design. Here is a diagram showing a Tesla PW2 implementation. My thinking was a similar architecture where one of their PW2 systems was replaced by a single 12KW/30KWHr DIY system consisting of about 30KWHrs of 6 Tesla 5.2KW modules and one...

I wasn't aware of there being an ability to "curtail" solar inverters using the frequency. Where is this specified and does the Sunny Boy 7000 implement this capability? I was aware of the ability to shut off any UL1741 inverter by raising or lowering the frequency above or below the limit. It...

Thanks for responding. I've been looking around and there seem to be many claims of DIY Powerwall systems but yours is the only one that is done properly and is well thought out. I am interested in an AC coupled system. My PV system is composed of 2 separate systems built a few years apart. My...

This is fabulous. I would like to see a final design description. It went through changes. It's just what I was thinking about. Can you message members to ask him for the final design and results?

This is a fabulous post. I've been debating building my own Powerwall versus buying a duel PW2 system from Tesla. Below is a post I made looking for ideas. And someone sent me here. It would be great if you could document your final design with a design description, line diagram, choice of...