question

Your first image from the MPPT shows it trying to charge, but zero current. Usually this is either the BMS preventing charge or a connection issue.

No idea what the other two images mean.

A screen shot of the battery settings in the MPPT would help.

Maybe a dumb question, but did you tried to enter in the SS 150/100 settings and see if it's set for 48V?

Maybe it remained set for 24V and once set these MPPTs doesn't adjust automatically to battery voltage. You need to manually set the battery working voltage.

Solar panels 4500W (3 parallel x 3) ?
Voc of one panel is 37V
Current at Pmax is 17A

if this how your panel are wired = total 37v @ 102 amps PV max voltages need to be 5% > charging voltage your looking for

panels wired in parallel adds the current together and voltage is same

panels wired in serials adds the voltage together and current is same

and also you will exceed the max current input too the Mppt

Thank you a lot for your answer!

Yes, the first image about how mppt controller try to charge but can not to start.

The second images shows our experiment with 48volt power suply unit. We conected it instead of sollar panels because it was more easy to regulate volts. It helped us to understand that mppt controller can to start charging our 48V 200Ah Lifepo4 battery with U<76Volts.

When we conected different configuration of sollar panels it was hard to understand why mppt controller worked corectly with 24V battery and 1 sollar panels and why it didn't start to charge 48v battery when sollar panels could give 90..110 volts.

You also mention about BMS preventing. I also thought about this reason and thats why conected other type of battery without BMS. But it didn't helped.

Here is screen of battery settings in the MPPT. I tried different configuration

Thank you one more time for your interest to this question. I'll be thankfull for any ideas

Firstly disable equalisation for lithium

Secondly check battery makers recommendations. Looks as if your voltage settings are too high. This will cause the BMS to disconnect for battery protection

Probably good to turn on expert mode and select battery preset of smart lithium. This is meant for Victron batteries only, but will be better than your existing settings

Thank's for fast response and advices. Yes the settings from the image I had sent is not good for Lifepo4 48v battery.

The image of batery settings I sent as an example. We tried to use different type of accumulator batteries and different settings for them.

Now I use LiNMC batery and settings for it is like this

It works for my MPPT SmartSolar 250/85 But for my second Mppt SmartSolar 150/100 MC4 VE.Can it doesn't work.

The problem is not in battery settings. The problem is in value of voltes from the solar panels. If It's more than 76 voltes the mppt can't start to charge the battery. It's very strange. That's why I with my friend think about firmware.

How can I downgrade it? Because it is the latest version now v3.13

Is it a good idea?

Thank's in advance for your ideas.

I have 9 pieces of this panels

The conection is 3 paralel block of 3 cascade conection

With this 9 pieces of solar panels mppt controler 150/100 doesn't charge the LiNMC 48V 160Ah battery. When I conecting other my controller 250/85 everything perfect.

Also I tried to use only one this risen solar panels with 24V battery. In this way mppt controler 150/100 is working good

The screen is not in English but I hope it is enough for understanding

so now we panel spec right

With your panels wired 3 in series x 3 strings i.e. 3S3P pv max voltage is 127.2V min temp and PV min 73.4V at max temp temp rang +70c to -10c

and have look at victron Mppt calculator this wiring config is good for both 150/ 100 and 250/85 mppt

this 3 panels wired in series