Multiplus will not start

DIY
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1

I got home yesterday and found my multiplus to be off. It was working for a long time already(no config changes for months) The setup is a cerbo , a smartsolar mppt 150 45 , a multiplus 48/3000/35/50, a grid meter ET112 and a battery monitor BMV700.

I checked the following:

  1. There is mains on the input of the Multiplus.
  2. There is still 52.3 V on the batteries
  3. There were the temp and low batteries LEDs on
  4. I restarted the system and the multiplus will not restart.
  5. I unplugged the ve-bus cable and restart. -still nothing.
  6. I switched the multiplus to charger mode and I got the mains on LED to flash 12 times, immediatly followed by the float and then the bulk LED’s. After this nothing flash for a while and then the same sequence.
  7. When I set it to on again, After a while, the LEDs on the right side flashes once very quickly and then stays off for a long while.
  8. When everything is plugged in, I can see all devices on the cerbo, but the multiplus shows off.

Please confirm:

Is this looking like a hardware or software fault?

I suspect hardware, but a multiplus does not break normally.

Regards

Ettienne

2

Hallo @EttienneBloem

Pls check error code by using App VictronToolkit.
Low Bat and Temp together is Not a valid combination.

There are cases where a MP2 Gries to recommend. After three consecutive failed attempts, it needs to be disconnected from grid.

Additionally if you switch off the MP2 via VRM, it cannot be switch on by physical switch.

Hope this helps…

BR Björn

3

Or upload a video of the leds. It is worth double checking everything from end to end to make sure there are no issues with connections etc.

4

Thank you for the quick response.

Unfortunately, resetting the grid , was also done many times. I switch off the mppt, then the grid and then the battery. I leave it off for a while, then switch it on in reverse order. I checked it again, it is set to on on VRM, but status is off.

Ill get the app, check and report back.

Thanks

5

Hello again Bjorn

I don’t see the correct LED status on the app.

I did see ,though, that on VRM it says it is switched on, but the state is off. Then after a while it goes to switched on and state unknown.

It look like it is constantly rebooting,

Regards

Ettienne

6

Hello Nick

Unfortunately there is no constant LED status - All off under normal condition.

Thanks

7

See if you can connect to it with a mk3.
If you can, try reflash it.
Try disconnecting the mains and ac out and see if it comes up on its own.
Did you try setting it on via the gx device entry in the console?

8

Hello N[ck

I got hold of a mk3 and tried to re-flash it to 2620459. VEflash said it was successfull, but now the multiplus does even less. If it is on and mk3 plugged in, it operates some relay on and off continuously.

If I unplug the mk3, it still operates it, but slower(2seconds)

I tried that with another version as well - same result.

I cannot connect to it with ve configure anymore.

It looks like there is program error.

I did remove all power every time I reset it, Then connect battery, grid and charge controller(in that order) . Then I powered it on with the switch.

9

You did reprogram it after the flash? All settings are lost.

10

Ettienne said:

@EttienneBloem

Can you look into the VRM Logs if your system is connected to VRM?

11

He could at the time.

Also important to not have the GX and mk3 connected simultaneously, it will cause connection issues.

12

What happens if you connect ONLY the battery and switches the MP ON?

… no grid, no charge controller, no energy meter, no bmv

What exactly does this sentence mean?

The MP was switched ON an grid was set Off/On many times?

13

No. When I reset the system, I switch off everything. So it was completely switched off. I did that a few times

14

If I just switch it on with nothing but battery connected. No LED’s just a relay tik tok tik tok ….

15

Probably time to take it in for testing then.

16

I have it like that

17

Agreed Thank you for your help. I appreciate it a lot.

Ettienne

18

You wrote ( after the MP crash):

Both LEDs are not a “valid combination” says the Victron Toolkit. But could it be that at first was the TEMP and after this the LowBatt activated? (or vice versa)

If the internal TEMP or LowBatt sensor is faulty the system cannot fully starts up?

Question: It is possible to see the MP boot process live via MK3 or a other connection to the MP interfaces?

19

I don’t know if someone can, but I cannot yet.