Growatt ****py 3KW inverter!

I recently started my solar journey with enough money to buy a Growatt 3KW 48 Volt inverter (SPF3000TLHVM-48) with a 3.6kW Dyness battery. The units were installed and the battery would charge off mains. I then got more money and wanted to add 5 x 605Watt panels (3025 Watts) panels so my system could charge fully in an average day and lo and behold when I went to my supplier to buy the panels they told me that because of the Amperage being too high, I could only connect 2 of the 605 watt panels. So...I have a 3000 watt inverter, but I can only connect 1200 watts worth of panels??? Makes perfect sense, right? WRONG! So now I have 2 problems. 1. The 3KW GroWatt inverter has a fan on 24/7! Yip, the fan stays on, and is quite loud, ALL THE TIME. The other inverters, I was told after I bought the unit and complained to my supplier, are all silent and do NOT have the sound of a fan on constantly! 2. As I can only connect 1200 watts of panels, I am charging my battery at about 1/3 of the normal rate. IE, it will take 3 times longer to charge my 3KW battery that it should normally do.

I would really love to hear from somebody at GroWatt as to the incredulous design approach they took! I have made the big investment for my home only to be awoken by these two very irritating issues. The solution to my problems, would be for Growatt to buy my inverter back from me at the price I had to pay for it (R9 999) so that I can go and buy a REAL product that does what the product is expected to do! I am waiting to see what Growatt's approach to me will be.....