Johan 690RFR

Good evening - it seems I have the same problem as the original poster and I wonder if you could assist. I'm not clued up enough to give too much technical detail but I will try my best to find out if I haven't listed it below. The following components have been installed Victron MultiPlus 48/5000/70 Victron MPPT 250/100 charge controller Victron Color Control 4 x Pylontech 2.4kWh batteries 12 x Canadian Solar 365W T4 (x3 in series and then paralleled) PV protection DB (1 x Beny 63A 'Local Switch, 2 x Onesto C32A CB's, 2 x surge arrestors) 2 Mersen battery fuses 125A Problem: The installer originally installed fuses but after the 3rd one blew over 2 x week period (since the installation was completed) he suggested replacing them with the current circuit breakers. This obviously didn't solve the problem as the breakers (anyone of the two) still trip (usually between 11:00 and 13:30) every now and then. Recorded the trips when solar charge between 1,700W - 2,800W. Some day the breakers don't trip at all with charge from solar as high as 4,000W The installer recalculated that without any losses or voltage drops the installation is recorded at 33.93A which could be the problem and suggested that the 32A breakers (mcb) be replaced with 44A ones as the cabling allows for it. Question: Isn't it dangerous to just increase the breaker size and must one perhaps get a 2nd opinion before going this route? My installer is a well known and respected electrician registered with the the ECA and who has been in business for almost 30 years. He started with solar installations approximately three (3) years ago and appear to be well versed in what he's doing. He issued both an electrical and solar COC for insurance purposes Who does one approach for a 2nd opinion? It seems there is a general reluctance to assist if the installation was done by someone else. I basically just want to make sure my 200k investment don't go up in flames. I'm absolutely willing to pay for proper advice Guidance in the right direction is really appreciated. Regards Johan