EmilBenvenuto

Hi all, I have an Axpert Max 7.2kW with 3x Pylontech US2000C connected in parallel via RS485. Current settings: Param 01 (output source priority): SBU Param 05 (battery type): PYL Param 12 (back to grid voltage): 48V Param 13 (back to battery voltage): 49V (lowered from 51V as a possible fix, no change) Param 29: 45V (locked, cannot be changed in PYL mode) Firmware U1: 69.01 / U2: 112.19 Every evening when solar drops to zero, the inverter switches to grid and stays there all night. The batteries are sitting at ~49.8V with all SOC LEDs fully lit on every module and no fault codes on the inverter. During the day the batteries charge fine from PV and reach around 53V. After sunset they settle at ~49.8-49.9V, which is above param 13, but the inverter never switches back to battery and ignores them completely until solar comes back in the morning. I'm wondering if this could be a communication issue between the Pylontech BMS and the inverter in PYL mode, where the BMS might be sending some kind of signal that keeps the inverter on grid even though the batteries are ready. I'm planning to test with RS485 disconnected and param 05 set to USE to see if anything changes. Has anyone tried this as a workaround, or does anyone have a better idea of what might be going on? Thanks

I have never flashed firmware on an inverter, and I wouldn't even know how to do it, but I would tend to prefer not to, except to have the Kettle Comp modification. What would be the firmware containing this modification for my inverter? Also, I have another question, although it has nothing to do with this topic, the Voltronic inverter parameter 2, i.e. Maximum charge current by default is 60A, should I change it?

Thanks for the information. Do you think this configuration will work? 12: 46V 13: 50V 29: 44V I have no idea if 12 is too little, but isn't 48V too much? I don't know how a battery works from a technical point of view. Also, do you think it is essential that I update the inverter's firmware? Connecting with watch power I read this data: cpu version: 69.01 remote panel cpu version: 112.19 ble cpu version: 0

For parameter 5 everything is OK as it is a mode provided by my inverter for communication to the Pylontech battery. I have 3 US2000C in total. The default 12 is 46V, could the battery data sheet which says Discharge Voltage (V) 44.5 ~ 53.5 be useful? The parameter 29 actually in practice what should it be used for? As safety? Because then 12 and 29 should do the same thing in theory.

You are fantastic! It's great to find experienced people who help people in trouble! Thanks to your excellent answers, I think I have understood the problem. I will describe my current setup of parameters that might be useful to you: In the last message I misstated the model of my battery, I actually have Pylontech Turbo Energy US2000C 5: PYL 12: 48V (obviously wrong) 13: 53V (perhaps too much?) 29: 45V Now, as you can see I think my inverter is set up wrong as I am not an expert and you certainly know more than me. Could you tell me on the basis of my batteries (whose data sheet I enclose anyway US2000C-specs.pdf) the correct settings for these parameters? Thanks very much.

I think I have a problem with my Axpert Max 7.2 KW inverter, I have paired it with three Pylontech US3000C 48V batteries, I also have two strings each of six 375W panels. I have set inverter setting 1 to SBU, (ie: Solar power provides power to the loads as first priority. If the solar power is not sufficient to supply all the connected loads, the battery power will supply power to the loads at the same time. The AC grid will only supply power to the loads when the battery voltage drops below the low level alarm voltage or below the reference value in setting 12). Instead the 12 setting I have left it default at 46V, however I have noticed that the inverter, especially in winter, trips to supply power from the AC even if the batteries still have three notches, so not using all the stored energy, how do you think I would solve this?