Multiplus ESS - Select Multiplus DC over BMS values

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max-payne asked Jul 26, '23

Multiplus ESS - Select Multiplus DC over BMS values

Simple ESS Question:

Pylontech US5000 connected (which is a 15s battery) with the CAN port. Everything works perfectly.
Now the Pylontech was expanded by a second offbrand battery pack in parallel. Everything works as expected but I want to set the Battery current sensing source as the DC current of the MultiPlus II and not the batteries BMS values.

Since a second pack is connected in parallel the charging power and amps is off by a factor of 2. Discharge limit is working correctly since that is limiting the AC feedback of the Multiplus.

Summary:
I want the Battery current and power to equal the DC current the Multiplus is measuring and not the values from the pylontech CAN BMS.

Is there a way to set that as the source for Battery:

Instead of the CAN BMS?

ESS ess settings ess discharging

screenshot-2023-07-26-145507.jpg (59.3 KiB)

screenshot-2023-07-26-145558.jpg (58.1 KiB)

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Answer 1 · 2023-07-26T13:16:41Z

nickdb answered · Jul 26, 2023 at 01:16 PM

You will be better off disconnecting the BMS altogether and using a shunt instead.

Also be aware that your Pylon warranty has gone out the window by mixing brands.

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Answer 2 · 2023-07-26T15:07:58Z

max-payne answered · Jul 26, 2023 at 03:07 PM

Disconnecting the pylontech BMS CAN would also work I suppose as the charging curve set in veconfig is perfect for the pack. Pylontech is outside warranty period already anyways.

I already have different brands of 15s lifepo4 towards the Lynx distributor so adding a
Lynx Shunt looks like a good idea!

SOLVED!

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