I'm having a small issue since the beginning of my (near) offgrid installation. Everytime the fridge compressor needs to start, it is very much noticeable on the lights. They flicker a little too much compared to what I wanted to be ideal.
Of course, this is expected to some degree. One must design system with a sufficient margin for the load peaks. My inverter was initially a 24/3000. I later added another one in parallel. They are fairly balanced, so I expect that now I have a system better or equal to an 24/5000. Further down the road, I improved the cabling to batteries from 50mm2 to 70mm2, and just about 1m lenght to busbar + 50cm to inverters. Even the fuse I passed from 250A to 300A to reduce resistance. Later on, I even changed to LiFEPO4 batteries (14kWh), with reduced internal resistance...
Well, even with all these improvements, although it got slightly better after each step, I never managed to remove the flicker on the lights to the extent I really wanted. In fact, I have a small impression (hope I'm wrong) that is getting slowly worse rather than better. Does anyone believe that is anything wrong with my system? Only about 3 years old. Could it be Multiplus capacitors or any other component is showing "tireness" due to the fridge constant startups all day long during the past years?
Below an example that makes the lights flicker. The voltage seems to go too low with too much ease for this kind of load. It's a ~150W fridge. I'm kinda worried. Or am I expecting too much?