MPPT RS v1.17 Short Circuit

Q&A and troubleshooting
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1

My MPPT RS450/100 has been triggering a short circuit alarm at first light in the morning, only after upgrading to V1.17.

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Toggling the charger enabled immediately fixes it and charging resumes.

I have 3 other sites with the same hardware and firmware, not exhibiting this behaviour. The only difference is that this one is on VE.Can and the rest are VE.Direct, for what it’s worth.

I will downgrade to V1.16 and monitor.

Please advise if this is a bug or if there is something else that can be checked.

2

Thanks for reporting, I’ll pass it on.

Also if anyone else is reporting something similar please post here as well.

It would be very useful to know if there is any change when you roll back to 1.16.
My first suspicion is that there is an issue with the installation itself, and the firmware update was a coincidence in timing.

That information would help.

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3

These alarms did not propagate to VRM, so I was left wondering why the system was producing no solar power.

Nothing in the alarm log and of course no notification.

I have now set up a custom alarm rule, trigger on all error code except No Error.

Should the charger alarm automatically propagate or is a custom rule required?

4

Downgrading to v1.16 seems to have resolved this

5

Hi Guy,

I have upgraded to v1.19, as the changelog mentioned:

Improve short circuit protection

The problem has resurfaced. I will downgrade to v1.16 again.

Please advise if you need more information or access to the installation.

6

@guystewart I also had this issue on a site, rolled back from 1.19 to 1.16, will monitor and see if it holds up.
Connected on the VE.Can side.
Let me know if you need more info.

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7

Hi Guys,
the same problem has been happening for the past 4 days. Turning the MPPT off and on resets the error for that day.
Nothing is reported to VRM.
I updated to 1.22 this morning, fingers crossed.

8

I never received a response, and the unit is not currently in operation. I just gave up and left it at v1.16

It is definitely related to firmware, as rolling back to v1.16 fixes it every time.

I could also fix it by enabling and disabling the charger via Victron Connect, so I didn’t have to physically be at the unit.

9

With version 1.22, the problem has been further exacerbated. Now there’s a short circuit even at sunset.
I’ve downgraded to version 1.16. We’ll see how it reacts tomorrow morning.