RS MPPT smart charger 450/100 stuck on error code 29

Q&A and troubleshooting
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1

Hello

Can anyone provide some advice?

I have a well established off grid system working for over 2 years without issue.

I have a multiplus 2 10000kva

2x smart solar RS MPPT 450/100

Lynx In

cerbo gx

Fogstar 15.5kwh battery - can bus connection

Ja solar 445w solar panels

My MPPTs have the set up as follows

Charger 1 - 2 strings of 9 panels

Charger 2 - 1 string of 8 panels

Charger 1 is stuck in the error code 29 -overcharge protection. I have tried everything, tried disconnection, rebooting, swapping pv cables. Nothing is working.

My assumption so far is some sort of mismatch between the charger and the battery and the error is stuck there.

Any help would be appreciated

(Recently added the victron EV charging station and that’s been working well. Photo shows that there was plenty sun today and the charger 1 was giving no output and even when battery drained a bit the fault didn’t reset)

IMG_2910
IMG_29101125×2436 227 KB

2

Reduce the string number to 8 panels on each string on charger 1

Make sure it is programmed exactly the same as the other mppt. And it is for a lithium profile. And it is reading its terminal voltage correctly nad all are torqued ok (app and multi meter confirm)

Which model exactly?

Did you run your config through the calculator?

3

Thank you so much for your reply

JA Solar 445W N-type Double Glass Bifacial LB Traceable with MC4 connectors

VoC - 39.1 (x9=351.9)

I’ve tried swapping to 8 panels, tried hard resetting, factory settings, disconnecting from VE. Nothing is working

4

What doyou mean by this statement? Were you using it in the victron smart network?
You shouldn’t be as you have a GX

5

Sorry from the VE direct cable

6

Ah. Ok so if i understand correctly, the method was

  1. unplugged from the GX
  2. Reset to factory (tested still unplugged) hasn’t cleared the error?
7

Yes tried restarting device with it unplugged from cerbo - error remains. The fault doesn’t show on startup but the symptom of it alternating between bulk and float and not providing charge output remains

8

If it is not running in stand alone.
And the voltages are reading correctly and not moving into the overcharged territory, then there may be an issue.

There is a methodical way to work through everything.