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Pylontech US3000 stuck in absorption in ESS setup.


PJJ

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Hello again guys!

I once again come in search of your wisdom :P

Ok so 2 things that I have noticed that just don't seem right:

1: The ESS setup shows the battery goes into Bulk and Absorption, but never into float.

2: The Absorption voltage that is reported also seems low? The highest voltage the MPPT has thrown to it seems to be 52.3V and it hovers around 52.0-52.2 during the day.

I did setup the 

I attached a image of remote console showing the behavior. 

 

Here is the charger settings :

MultiChargerSettings.png.fffb0026550cd525f1ef66dedce9725e.png

 

Here is my ESS System setup settings as well:

ESSSystemSetup.png.e85cfc2dc9ed1633909ea53378c52f03.png

ESSSystemSetup2.png.c3e4e335e83ecad5aaee84c936ffe707.png

ESSSystemSetup3.png.570bd02b13fdf3e77dd08fef7eb9db15.png

 

And here is the Networked operation settings on the MPPT:

MPPTSetup.png.82955df2ea3234c226bc952af135d2bd.png

 

Am I doing something wrong here?

Thanks in advance guys!

remoteconsoleAbsotionstuck.png

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Question: Are there absorb and float stages for lithiums? Is that not lead acid specific setting?

With lithiums the case being all in / out of batteries at the pre-set volts?

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2 hours ago, PJJ said:

2: The Absorption voltage that is reported also seems low? The highest voltage the MPPT has thrown to it seems to be 52.3V and it hovers around 52.0-52.2 during the day.

The BMS tells the Multi what voltage to charge to, so the concept of absorb and float doesn't really apply. The BMS just sends a static value of 53.2V.

This value is however too high in my opinion, and definitely if you want to do things like feeding excess PV into the grid. So we essentially ignore the BMS and substitute 52V instead. See here for the reason. Basically anything above 3.3V really stores little extra energy and increases the possibility of the voltage spiking up to 54V where the BMS turns off. So it is deliberately lowered by about 0.1V per cell. Of course this means the battery only charges to around 97% SOC.

Edited by plonkster
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