Multiplus-II in parallel not exporting to grid

Q&A and troubleshooting
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Hi, I have 2x Multiplus-II 5kva (1x easysolar, 1x multiplus) installed in parallel with Dyness B4850 Battery system. I have set up this system many times before with a single Multiplus-II with no issues.

My problem is the paralleling seems to cause a few problems.

When the battery is still charging I get full expected power from both MPPTs. When battery is full the MPPTs throttle down to match consumption. I have turned on export excess DC, and have changed max charge settings on DVCC to a few tenths of a volt below Dyness recommended. Cant seem to figure out.

Additionally, I have 1 CT on the Easysolar (master) and the CT loop has been removed on the slave unit. On the programming, master has ticked box for external CT, where as slave has not. However, when I force battery power to grid, if I choose -5000W grid setpoint, the VRM will show 2500W going to grid. Something wrong there.

Any help appreciated.

Thanks

2

Where is the CT placed? On the combined feed?

3

Try reinstating the CT loop on the slave unit. It does need to be able to measure it’s own current too.

4

CT is placed on the incoming grid live

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