BTFD

Hi Charl
While waiting for my new inverter and 12 panels to be installed I connected a 425W panel to a single Hoymiles 1200 input and it worked well.
I had a 4 way combiner unit so connected 4 x 425W panels to a single input Hoymiles 1200  - also worked well.
So then I went big and attached 2 panels per DC input for 3 inputs and 4 panels on a single input.  It continued to generate power and worked well.  No problems.  
The comment from Hoymiles support was it is a waste of power but nice to know IF I had extra panels to use?
The Hoymiles 1200 appears very well built!
Barry
 

I watched the P-Grid and at no time did it approach the MAX
The temperature stayed low (compared to the normal hot day where they an go to over 80)
You taking about 3 X 405w -  connect them and watch the data, going into winter you not going to have a problem, but please do contact technical support to share your concerns / get their suggestions.
I have found a dramatic reduction in power generated over the last few weeks as the sun weakens.
Please let me know what you find?

Hi Charl
While waiting for my new inverter and 12 panels to be installed I connected a 425W panel to a single Hoymiles 1200 input and it worked well.
I had a 4 way combiner unit so connected 4 x 425W panels to a single input Hoymiles 1200  - also worked well.
So then I went big and attached 2 panels per DC input for 3 inputs and 4 panels on a single input.  It continued to generate power and worked well.  No problems.  
The comment from Hoymiles support was it is a waste of power but nice to know IF I had extra panels to use?
The Hoymiles 1200 appears very well built!
Barry