I'm also very new to this Forum. Greetings everybody.tueddelkopp wrote: ↑Sat, 22 Aug 2020, 00:26 Hello and Greetings from Germany, i am Rolf and i am new in this Forum.
I have a 4 kW / 5 kVA / PF0.8 Inverter with triple SCC, the Solarpower24 PRIMO MKS TRI 5K-48. I want to use it with 3 Pylontech US2000 LiFePo4 Batteries and with a Grounding Box to connect Earth to Neutral in Inverter Mode.
My first Problem was that my original Firmware 75.10 hasn`t had the Option 38 to use the Grounding Box, so i tried the patched Firmware 75.31a from this thread but this Firmware do not have the Option 38 too.
You do not need the grounding box. As I found out on my Axpert MKS 5K the neutral of the inverter is grounded right at its output before the bypass switch. If it switches to bypass the inverter is off the grid and therefor the ground off.
Actually I didn't want this grounding because I wired the neutrals of inverter and charger together. This inside grounding can be removed or installed if not already there by removing or inserting the grounding screw. It is on the inverter board underneath the microprocessor board. There is an earth symbol next to it and a symbol indicating that it can be removed. You have to remove the microprocessor board first to access the grounding screw.
Check out your inverter in totally off condition by ringing with a multymeter between neutral and ground terminals.
Actually the way the system was delivered it is in contradiction with program point 38. Since the grounding already exists inside you cannot us an external grounding box.