Does the pylontech bms restrict charging at low temps?

The manual says it works between 0-50C, but does it have a low temp cutoff, no charging?

Yes, the BMS restricts the rate.

I found this out a few years ago because my stack is in the garage and the temperature in there got down to about 5°C during the first winter after I installed it.  The BMS limits both charge and discharge rates on a sliding scale depending on the temperature.

Since then I built a better stack with about 200mm of solid insulation around it and a proper heating and cooling system which helps to keep the temperature > 20°C in the winter and < 30°C in the summer.

This is the chart that I got for the US2000B, presume the newer models would have similar failsafes built in.

 

 

 

12 hours ago, martynw said:

Yes, the BMS restricts the rate.

I found this out a few years ago because my stack is in the garage and the temperature in there got down to about 5°C during the first winter after I installed it.  The BMS limits both charge and discharge rates on a sliding scale depending on the temperature.

Since then I built a better stack with about 200mm of solid insulation around it and a proper heating and cooling system which helps to keep the temperature > 20°C in the winter and < 30°C in the summer.

This is the chart that I got for the US2000B, presume the newer models would have similar failsafes built in.

 

 

 

Thank you very much, even Pylontech told me it does have low temp cutoff, but nobody has given me the actual parameters like you have!

No problem, it was quite a bit of head scratching at the time as to why the stack was suddenly taking much longer to charge.

On 2020/05/25 at 10:52 PM, martynw said:

This is the chart that I got for the US2000B, presume the newer models would have similar failsafes built in.

 

 

 

Does anyone have this data for US5000 or know where I can find it?

Also, any idea if the quoted 6000 cycles assumes 0.5C (0.8C in the case of US500), or some lower value?