pintopf

I think, a noise-free version doesnt exist,because a minimal air convection must exist. In my VMIII Twin - 400W works with DSP Firmware Version 60.95 and Display 25.12. In this 60.95 version are the fans are controlled by temperature and under less output power the fans produce less noise. I think, this version is a good compromise between cooling and noise.

Thank you for the new version 68.13 ! Yesterday i put this version in my VM III twin 4k and its work fine, but i think, that the internal measurements of the inverter are in this version very optimistic. I have an offset on the battery charging output of +4A, that means, if no current flows, the axpert shows me 4A. Also the internal measurement of the solarpanel-current are above 150-200V Voltage more than twice as high as in reality. Under this voltage, the display shows the correct value. Badly, it looks like that the internal MPPT uses this wrong values, and the output power is less than it can be. Also, the statistics in dessmonitor shows much to high values. In december we have short, dark days in germany, so that every watt counts ;-) My next step was to reinstall the version 60.95 , but by this action my computer gives up and die without any sign of life. I think, that any yovervoltage from the RS232-port from the inverter bricks my computer. The lucki thing was, that i can bring him back to life, with the help of chatgpt. I bougt an galvanic isolated USB->RS232 interface and installed today the older version 60.95. I testet also the version 60.87, but in this version are the fans very loud. Greetings, Peter

My inverter sends energy back to the grid, if the batterys are full charged or the charging current is over the maximum. ( if "Solar Feed To Grid" is enabled.) Interestingly i don't see it at the inverter-display or the app. I see it only at my shelly.

See the attachement. The graph shows an 1 hour intervall. Firmware: 60.95

Here is it : \x51\x50\x49\x47\x53\xB7\xA9\x0D

I attached the file. This file is from this thread, date june,13. My node-red program sends cyclic the "QPIGS" command to the inverter, and the answer contains also the heat sink temperature. If the fans run faster under load, the temperature drops, and start to rising under heavy load but reaches never 50°C. I don't log the temperature but i will tomorrow use 2000 W for some time out of my batterys to show you the graph from the node red -UI. VM TWIN_Ver60.95.7z

I read in this thread, that with the firmware 60.76 the fans are much more silent, thats way i testet it today. The version 60.95 was replaced by 60.76 an i measured the noise under no load condition, with 230V output switched on. Heatsink temperature was in both cases 35°C at 18°C ambient temperature. My measurements in 1m distance from the inverter: FW: 60.76 44dB FW: 60.95 44dB I heard also no difference.

This is the reason, why i bought the 4000W Version, it consumes "only" 45-50W in standby. My solution for the batterys was an another ESP (ESP8266) to read out the status of the batterys. I found the project at github: click! It produces also MQTT-Messages and creates a simple web-interface. For the solarpanel i found no switch for the 400V without great losses. The chinese DC-relais are often fakes (AC-Relais labeled as DC-relais) and the solid-states eats too much energy for my case. In this bad wheather i use the VMIII only to charge my batterys (if its not so gray as today ;-). If my battery has enough energy, i discharge them with a Hoymiles HM600 Inverter in the normal grid. His efficency was between 90-95% and it is fanless. I control the HM600 over my third ESP in my cellar, this project i also found at the internet. My house automatisation ("Homematic" from ELV) control all this devices via MQTT via Node-Red. I agree with you, that this solution is only for your own use, it is not a good idea to install it on your father. You have to design the relais to the maximum current, which is possible from your batteries, this are 120A, this relais are big an have noticeable energy-consumption. Otherwise ist the risk, to burning your house down too high. Ther are some risks in the use of solar-inverters: The high DV- Voltage at the solar-input and the high current at the battery in/output. Don`t underestimate that. Here is a small video, which shows this effect at only 60 V, demonstrated in an opened AC circuit-breaker. Sorry, it is in german, byt the interesting part need no words and is shown from minute 2:45. Video!

Hopefully you use a ATS for high DC voltage for your solarpanels, otherwise ist very risky to switch high DC voltages, long sparks occur. I live in Berlin/Germany and have the same problem like you, on some days my inverter produces less energy then he put into the battery. My goal was to save the energy, consumed at nigt by the inverter. (40-50W for my 4000W model) My solution was a small circuit with an ESP32 controller, wich communicates with the inverter via RS232. This ESP32 communicated via WiFi (MQTT protocol) with my house-automatisation. The main program on the house-automatisation is in "node red" programmed. There i programmed the round power button to be (virtually*) pressed 30 minutes before sunrise. After sunrise, i switch the button off, this saves around 20W. * I tapped the connecting cable between the display and the device in order to connect an optocoupler in parallel with the switch, which is triggered by the ESP

I testet it at my 4kW VMIII and the result is: 55W with depressed button and 65W with pressed button. My mode was "SBU" I switch an measure the grid with an "shelly 1 PM" Why do you not use a automatic power transfer switch to solve your problem? I think, that this mode (without battery) is not optimal for the inverter. I use this switch: (see photo)

If your inverter starts at the first attempt in the morning? Without grid and power-button "off", my inverter often destroy the EEPROM Data at the interupted boot attempts, as i showed yesterday Not the same, but with the older display-firmware my battery lost sometimes (1 - 2 times per day?) the conection to the inverter, the battery symbol at the display stop blinking, and the warning shows. After i installed the new firmware, this never happens again. (or it happens, if i'm not in front of the inverter?)

I had similiar problems in communication between my inverter and the pylontech-batteries. The display firmware update to version 25.12 fixed it.

Hi @ monsam, i had a similiar problem with my VMIII Twin / 4kW last year, in my case lost the inverter his serial number. The problem was, that in the morning, with 230V off and Inverter off (round button not pressed), when the sun begin to shine, the solarpanels create not enough energy for complete startup the inverter, so many attempts were made, until he starts. Every attempt causes an interrupt in the start-up procedure, and sometimes the EEPROM becames corrupt. You will see it in Watchpower, Energy-Mate or Dessmonitor under "Alarm"

Is here anybody with an "stuck at 60V" problem with 60.95 software? Since i installed this firmware, mine MPPT works fine. I attached a plot from today until now, a cloudless day: ( red: solar voltage ; blue solar current)

I see, that my inverters MPPT starts if PV-input current reaches 0,2A . (FW 60.95) With panels in parallel, this current is reached earlyer. At the beginning of this year, i testet a lot of connections between my panels and my inverter. I found also out, that 2s 3p was a good solution, but it was a lot of cables in my garden and the current was very high, about 25-30A at around 100V. After this tests i experimented with TIGO "TS4-A-O" Modul-optimizer (Link ), and they worked nearly perfect in my system. This optimizers reduces the output voltages from the modules and keep the current constant in the system, so thad shadowed modules produces less power which added to the string-power, instead of reducing the overall performance through the little current they produce. So, the max current is 9A, and the maximum voltage 350V. Then was only the problem with "Stuck at 60V" with the older firmware, but this has @Coulomb solved. After i installed the 60.95 firmware, the noise of the fans decreased and the MPPT works fine, without any patches. Thankfully i used pylontech batteries, so that the discussed battery-problems are not mine. The picture shows a average day.