Mppt250/100 no carga; Voltaje baterías diferente

[PedroPablo]

Hola

Tengo una instalación aislada donde desde hace unos días el Smart solar MPPT VE Can 250/100 ha dejado de funcionar. Tiene tensión de batería y de placas pero no vuelca energía en las baterías (BYD Litio). Si os dais cuenta la tensión de batería que mide el MPPT ( 56.50v) es mucho mas alta que la que se mide en el inversor (51.96V), con lo cual estaría por encima de la tensión de absorción claro. Alguien ha tenido un caso similar?? Está actualizado a la ultima versión y lo he reseteado pero sigue igual..

[lxonline (LX)]

Do you have any fuses between the mppt and the battery? If you do check them.

[PedroPablo]

The fuse and DC protections are good, do you have any other ideas what could be wrong?

Thanks

[lxonline (LX)]

If you disconnect the (solar first) mppt connection to the battery does anything change?

Have you verified it with a digital meter?

One of the checks is to make sure what is being shown in software is the same as a physical reading. If it fails that then it is faulty.

[PedroPablo]

I can’t be sure because I’m not at the installation right now, but I’ve noticed that the Quatro and the BMS are measuring the same, while the MPPT is measuring 4.4V higher.

[lxonline (LX)]

@PedroPablo

I’m not at the installation right now

@PedroPablo

The fuse and DC protections are good

How was this verified then?

A physical verification is definitely needed unfortunately. Nothing can be done remotely to troubleshoot (only see there is a problem as you have noted)

[PedroPablo]

@lxonline

How was rhis verified then?

The owner of the place verified it

A physical verification is definitely needed unfortunately. Nothing can be done remotely to troubleshoot (only see there is a problem as you have noted)

I’m going to try to get someone to take the measurement for me with a multimeter.

Thans for your support

@lxonline

How was rhis verified then?

The Owner verified it. I have to trust him

[lxonline (LX)]

Trust is different to scientific method. Why i ask is sometimes with a fuse a look is not enough it needs to be actually tested with a meter.

I will be keen to hear the findings of your representative.

Further testing is outlined in the pre rma form.

6. Formulario de pruebas previas a la RMA - Cargador solar MPPT

[PedroPablo]

I’m sharing the diagnosis and solution to the problem so the entire Victron community can access the information and my experience.

I finally managed to schedule a day for the owner to carry out the checks you indicated, with my remote assistance.
When removing the cabinet covers to check the fuses and measure the battery voltage on the SMART SOLAR, we observed that one of the negative battery cable terminals had overheated.

Once the connections were corrected and all the battery and panel wiring was checked, the Smart Solar is working correctly.

You were absolutely right, @lxonline! “A physical verification is definitely needed.”

Thank you very much for your support and help.

Best regards