question

1. Are the any errors logged when you check via VictronConnect or the GX device?
2. Are you sure that the PV voltage hasn't ever exceeded the 250V max PV voltage limit? As that will permanently damage the MPPT, you can check via VictronConnect or the GX device (it is shown in the the 'Overall history' screen).
3. The wiring you are using for your battery connection looks like it is only ~4 or 6mm² - this is way too small and unsafe to carry a 100A current. It may have overheated the terminals and internal circuitry. I highly recommend that you rectify this before you start a fire.

Hola, que tipo de baterias tienes y a que voltage funciona tu instalacion ? Lo que te sugiero es desconectar todas las fuentes electricas que llegan al MPPT, es decir paneles Y baterias. Te esperas unos 5 minutos, reconectas baterias. y despues reconectas los paneles.

Que tipo de paneles tienes, cuantos, y como van conectados al MPPT ?

Otro problema importante, es el tamagno de tus cables que van a la bateria, son de 6mm2 y insuficientes. Eso puede provocarte un incendio por el calor que van a generar con altos amperios. Buscate cable de 35mm2 (tipicamente cable para soldar) y pon lo para ir a las baterias.

Me paso algo parecido, pero en mi caso fue el corta-circuito de 125A que se estropeo y tuve que cambiar lo.

Ya diras si esto te soluciona el problema. De mi punto de vista, el MPPT se habra sobre calentado, y desconectado en un modo para protegerse.

Michel

Hi @n0ga86

I note too that the mppt is under "External Control". We would need to know what that is?

Hello,

and thx for the answers, it under a color control unit.

It didnt report any error as far as I can see, and the batteries we use are 7 pylontech us2000.

About the wiring it was what the installator have chosen to use, we are complet ignorants.... I can say that the unit used to heat up, I dont know if beyond whats normal o not...

How should we proceed? reseting the unit by unplugging everything?

+

The overall history

Even though the MPPT does not have an error at the moment, I can see from the error history that BOTH Error #26 - Terminal Overheated and Error #33 - PV over-voltage have occurred. Both these errors are 'self clearing', but depending on the severity of the issue/event that caused them it may still have resulted in permanent damage of the unit. These 2 errors are in line with what I suspected, based on the 2 images you shared in your original question.

I can also see that the max PV voltage recorded in the history is 249.9V; while that is technically 0.1V under the 250V PV voltage limit, it is possible that the PV voltage could have momentarily 'spiked' above this level (due to cloud edge effect) without it being logged. The 250V max PV voltage limit is a 'hard limit' and the PV array must be selected/arranged to leave an appropriate margin to this limit (factoring in increased PV open circuit voltage in extreme cold temperatures). Your current PV array configuration has no margin at all and is not acceptable (particularly if the controller is overheating at the same time from the significantly undersized wiring).

I recommend that you engage a qualified and competent installer to review your system and as a minimum:

1. Reconfigure your PV array to reduce the open circuit voltage to an acceptable/safe level for this MPPT (that likely means removing a solar panel from each string, and possibly making up a new string from the orphan solar panels)
2. Review and upgrade wiring as appropriate, the wiring from the MPPT to the battery is well undersized and totally unsafe

In terms of determining if your MPPT is permanently damaged, I would recommend to:

1. Temporarily disable any 'external control' of the MPPT so that it operates as a 'stand alone' unit, to eliminate that as the source of the issue - the simplest way might be just to temporarily disconnect the VE.Direct cable and connect to the MPPT via the VictronConnect app (to monitor output)
2. Disconnect all power sources to the MPPT (battery and PV), wait 3 minutes and reconnect

Only perform the above if you are confident that you know what you are doing, if not also refer to a qualified and competent installer for this troubleshooting.

Ok someone came yesterday and did check many stuff.... luckily we didnt set anything one fire, we're fixing it all by tomorrow (fingers crossed).

We're runnin 3 paralel series of 5 PV panels each. (see pic. for details on the PV panels) Should we reconfigure it to 4 parel series 3 of 4 panels and 1 of 3 panels?

Right now the installer that came yesterday will only shiwtch the wirings from the MPPT to the batteries and the inverter for a 16mm2 wires. Should he reconfigure the panels also in order to have more margin in the Voltage aspect on the MPPT?

One more doubt, since my inverter is the 48V 5000VA it shouldnt be able to deliver more than 100A when charging the batteries, (which right now could suck up 175A) checked pylntech data.

And the MPPT 250/100 shouldn't be able to deliver more than 100A either, is there anyway that Amperage could rise otw to it's destination? being this the inverter or the batteries? The lenght and diameter of the wire could affect that amperage?