MPPT synchronization problem

DIY
,
1

Hi,
I have a system with 3 MPPT´s , two 150/35 connected via VE.Direct to a CerboGX and one 250/100 connected via VE.Can to the CerboGX, this works perfect
The problem is that when I connect another MPPT 250/85 via VECan it don´t synchroniz with the others. It consider it self to be “standalone”
All firmware is updated.
250/100 status: Group Master. State: Ext.control
150/35 status: Slave. State: Ext.control
150/35 status: Slave. State: Ext.control
250/85 status: Standalone. State: Absorbtion

What have I missed?

2

Hi Nicke,
​Yes, they should VE.Can and VE.Direct MPPT charge controllers can be synchronized.

Do you have a Cerbo GX or GX device and have you enabled DVCC.
12. DVCC - Distributed Voltage and Current Control
Once DVCC is enabled, the VE.Can and VE.Direct MPPTs will coordinate their charging.

Interesting discussion here too.
What’s the deal with VE.Can charge controllers? | DIY Solar Power Forum
Dave.

3

Hi Dave

Yes, I have a CerboGX and DVCC is enabled.
There is synchronization between the two 150/35 (VE.Direct) and the 250/100 (VE.Can)
But the newly installed 250/85 (VE.Can) vill not synchronize with the old ones.

/N

4

Hi Nicke,

Did you get this sorted? If not, it could be faulty and time to RMA it.

But do some checks first > Pre RMA checklist

Good luck.
Dave.

5

Hi
Well, I got it “sort of” sorted
I connected the MPPT via VE.Direct and it started to behave as “slave” and syncronized charging with the others.
Not the way I wanted but it works for now.
Dont have any ideas what could be the problem with the VE.Can

/Nicke

6

Strange, bad cable, missing or faulty terminator?
Ok but the VE.Can on the MPPT might be faulty.
Worth a look 6. Troubleshooting Guide - MPPT
Good luck.
Dave.

7

I have two 150/35s connected via ve.direct to a cerbo-s. Then I have a 250/100 and 450/100 connected via ve.can.

Only the two ve.can connected sccs show an entry for “Network total power” in VC, the ve.direct connected sccs arent included. I asume this is normal as the ve.direct and ve.cans arent combined? They all do show up in vrm etc.