Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register
  • Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
  • The final cut of TMC Podcast #27 is available now with topics time-stamped. We discussed: Consolidation in LiDAR manufacturers; Volvo EX90 shipping with LiDAR; FSD Beta Full Release in N.A.; FSD detecting autopilot cheats, Gwen Shotwell directly overseeing SpaceX Starship; and more. You can watch it now on YouTube. We should have it published to podcast networks shortly.

Tesla Powerwalls 2 incorrect flows

F0316E10-9699-4CB0-91C5-1C349002DF80.png
98C08F91-ABDF-4C8B-AD05-E556D0265E60.png 98C08F91-ABDF-4C8B-AD05-E556D0265E60.png 98C08F91-ABDF-4C8B-AD05-E556D0265E60.png 98C08F91-ABDF-4C8B-AD05-E556D0265E60.png F0316E10-9699-4CB0-91C5-1C349002DF80.png
98C08F91-ABDF-4C8B-AD05-E556D0265E60.png
During the moning, while the batteries are charging it are using power from the grid instead of the solar array. Anyone have this issue?
 
Hard to tell from those screenshots, but looking at my own 15 sec interval meter readings, it's obvious that the Powerwalls will do a little push and pull to/from the grid as consumption and solar generation fluctuates. Most of the time it'll do a short pull of ~20W and then compensate with a push. Below is a screenshot of what's happening right now. I've got clouds passing through which is causing larger spikes.

Screenshot 2018-03-22 at 11.34.16.png
 
  • Like
Reactions: abasile

miimura

Well-Known Member
Aug 21, 2013
7,398
7,400
Los Altos, CA
The OP's slight continuous grid draw during morning solar production is a little strange. My system only shows 0.1kW to/from the grid as the system is adjusting the PowerWall charge/discharge current. Usually, the next update of the 4-circle diagram will correct itself.

On the other hand, if the CTs are not installed properly, it will make the system go haywire. In the chart below, someone came to work on my system and moved the solar CTs so that they were only measuring my SE facing array and the SW facing array was producing without being included in the Gateway's measurement. Therefore the home load was erroneously driven to zero and the SW portion of the solar was exported without the Powerwalls absorbing it. I moved the CTs (at about 1:15pm in the chart below) so that each one of the solar pair was around the wires for both solar circuits. Normal operation was restored. It started raining right after I fixed the problem, which is why the solar also dropped right after that. The system also changed to Self Powered with low reserve at 1:30pm, which reduced the PW charging to surplus solar.

2018-03-03_15-29-40r.jpg
 

mongo

Well-Known Member
May 3, 2017
16,103
58,086
Michigan
View attachment 288304 View attachment 288303 View attachment 288303 View attachment 288303 View attachment 288303 View attachment 288304 View attachment 288303 During the moning, while the batteries are charging it are using power from the grid instead of the solar array. Anyone have this issue?

Does battery charging to get back to reserve level override not using grid power? Powerwalls can only charge from the solar, when used in a system with solar (tax credit requirement), so that could explain this behavior (along with charging at slightly less than peak solar output).
 

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