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stuartpittaway / diyBMSv4ESP32

diyBMS v4 code for the ESP32 and new controller hardware
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CVL and Venus bug #278

Closed buddhafragt closed 4 months ago

buddhafragt commented 4 months ago

I used the latest software 9a0a3ed26f2dc973d3faf3e2799a6688da3ab13e and notice the Victron MPPTs (I use 2) have different charging power, but should have absolutely the same. So I did some research and monitor in Venus/Node-Red the CLV Voltage. Venus show 51.2V, but the charging voltage is set to 53.0V, also the float Voltage is set to 49.5V. Here seems to be something wrong.... Bildschirmfoto 2024-02-14 um 13 37 05

stuartpittaway commented 4 months ago

You have dynamic control enabled - this will automatically reduce the charge voltage to prevent the cells going over-voltage.

The float voltage is only used once the cells reach 100% state of charge - it will then enter the absorption timer (60 minutes) then drop to float.

The screenshot given shows a cell target of 3.45V = 16 x 3.45=55.2V maximum voltage. This will be limited by the 53.0V maximum you have set.

buddhafragt commented 4 months ago

So the Software also regulate the voltage? I thought, only the current is regulated according to the curve. I see, if I switch dynamic off, it goes to charge voltage. The voltage is correct, bcs. I have only 15 cells! Thanks for the explanation. I think, we need a manual...

stuartpittaway commented 4 months ago

Yes agreed, documentation!