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Tesla Powerwalls 2 incorrect flows

Icebox_inel

Member
Mar 22, 2018
24
22
Puerto Rico
F0316E10-9699-4CB0-91C5-1C349002DF80.png
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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?
 

docBliny

Member
Jul 26, 2016
96
49
Texas
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
 
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bkp_duke

Well-Known Member
May 15, 2016
5,587
19,704
San Diego, CA
I see this as well, and would consider it normal variance of the PW trying to keep your home voltage perfectly in spec. If there is a Vdrop from solar or the wall, it will let in some grid to compensate. Keeps the energy flow cleanest.
 

Shygar

Member
Aug 7, 2017
926
530
Pleasant Hill, CA
Yea this is normal. Every now and then it will pull 0.1kW according to the app. That's why on a day-to-day basis you generally see 0.1kW pulled from the grid, even if you never actually used the grid that day.
 

miimura

Well-Known Member
Aug 21, 2013
6,557
6,365
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
13,462
42,019
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).
 

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