DESS - unnecessary grid usage

[frantiseksobotka]

Contact Details

frantisek.sobotka@gmail.com

VRM portal ID

48e7da891f5b

Country / region

Czech Republic (cz)

B max

42.4

TB max

12

FB max

30

TG max

6.1

FG max

22.08

Battery costs

0.01

Buy price

(p+0.093676+0.0198+0.0196)*1.21

Sell price

p-0.021

feed-in possible

yes

feed-in control

yes

Version

0.1.20

What happened?

1. I have clearly lot of excess solar power, nevertheless the system is time to time during export time stopping export, stopping use of battery and start to use grid to power the consuption. Further more to start to charge the battery! It seems that the problem occures only during grid feed-in time and exactly at the change of the whole hour. System stops feed in and probably due to SOC under target it starts to feed from grid or recharge battery. With new hour and new schedule for SOC it is gone and the system works fine. So I believe that this issue comes only during end of hour slot. Problem is that with the high price difference between sell and buy that we have,, this consume 50% of all DESS saving.

1a:

1b:

2. The grid usage is not visible at the graphs - neither VRM neither node-red graphs.

When did it happen?

2024-04-22, 2024-04-23

Relevant log output

No response

Screenshots

No response

[frantiseksobotka]

issue nr.3 - in node-red version when during grid feed-in the SOC goes to minSOC, system start to use grid power to cover consuption. This is not acceptable in case that the prediction is 4x more PV production over consuption over day and actual PV production is able to completelly cover needs.