HennieW

Hi PierreJ
One thing you need to take cognizance of is during autumn and spring when it is cold, with occasional clouds, with bright sunshine hitting the cold PV panels when the clouds part, you get a huge spike in the current delivered to the MPPT controller(s). I have had more than doubble the rated PV current delivered for a couple of seconds during these times.
The point is your cables from the combiner box to the MPPT controller need to handle this spike. I have had my combiner box main 50A trip during such conditions.
Just a heads up. Nice installation.

HI All
As a user for some time now I share my experience on the 15Amp limit and how to manage it. I have two Axperts (2x5kVA), 6000W PV and 12kWh storage.
It is deemed as a UPS with solar charging. Not a SSEG connected to the grid.
I post these four diagrams for use to users that want to install more than 3500 watt of solar panels and have battery storage. In my case I utilize shore power (municipal power) for between 3.6% and 12% of the time per month over a 12 month period. There are many days (even weeks) when I do not connect back to shore power at all, but I need shore power when cloudy days persist for many days at a time and battery drops to below +-20%. August is the worst. Connecting back to shore power usually happens between the hours of midnight and say 09h00 at the latest the following day. In August it is longer, but it is only for that month.Solar block diagram 1-4.pdfThe purpose of my system is to be independent of municipal power as far as possible, and If the basic service fee increases to such an extent, then I will go completely off grid and operate a remote start generator for the 3,6% to 12% of the time.
In diagram 4 you have the best of both worlds. A Bypass switch, is very useful when things go wrong, but so is a suitable change over contactor that is operated by the software on the inverter. Diag 1 and 3 are similar but in diag 3 the bypass can handle more than the 15A as is currently allowed. In any case manage your loads via software or timers. Use the washing machine, tumble dryer and dishwasher when the sun shines.
Any comments or questions will be welcome.Solar block diagram 1-4.pdf