question

hooky avatar image

MPPT RS 450/100 error 35

Ok, so I have already read the other topic relating to this but that was an old post pre firmware v1.04 where there was a known issue with v1.03 false reporting error 35.

We have a few installations where we are getting error 35 popping up from mid/late morning onwards.

Clear days, no clouds.

All mppts updated to v1.05

PV config as follows - 9x Suntech 370w panels per mppt input on north facing ground mount array.

Voc max calculated to be 393V

Isc is 11.49A

Batteries are Pylontech US3000 set to float at 51V so satisfying the 8x rule as stated in the RS manual. ( float > Voc max)

Sites average temps during the day are ~30°C and above ( rural Western Australia)

Everything seems to satisfy requirements yet still getting the error 35.

So I know that error pertains to over voltage of the pv array but I don't see it possible.

If its not a firmware bug as per v1.03 then what else could it be?

I know max PV current is 20A per mppt input, but have read that you can exceed that somewhat without harm as long as the PV is not connected reverse polarity (voiding warranty in that case)

In this instance if we were to parallel strings, we would be at 22.98A Isc.

Would we be better off rearranging each MPPT to 2x parallel strings of 4 or 5 to eliminate the error?

mppt rs
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2 Answers
Thiemo van Engelen (Victron Energy staff) avatar image
Thiemo van Engelen (Victron Energy staff) answered ·

Hello,

Although firmware version v1.04 improved the number of occurrences of error 35, the behavior regarding error 35 is still not optimal and we are working on improving this. At this moment it is however unknown when this will be released.

We also do not expect that rearranging will make a difference, beside the fact that it decreases the PV voltage, and therefore decrease the efficiency.

Kind regards,

Thiemo van Engelen

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Do you know what is causing the Error? I have a few RS 450/100 installed but haven't encountered the error yet. Wondering for future installs.
hooky avatar image
hooky answered ·

Well that's not ideal..

We are about to deploy a number of these in a remote off grid system.

I hope the engineers are actively working on this issue to rectify as soon as possible!

Is there any workaround in the mean time?

How does the error 35 affect output performance?

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Hello,

As far as we know, there is unfortunately not a workaround.

Regarding the output performance: The MPPT will stop for 1 minute and then start converting again.

Kind regards,

Thiemo van Engelen