I have an off-grid system set up with 4 x Trinasolar 405W – 11.77A (Imp) – 41.4V (Voc) Panels wired as 2 x Series strings. Each string connected to a Victron BlueSolar MPPT 60A/150V charge controller MC4. Both controllers feeding four Rolls 6v S6-L16 Batteries (24v series) going to Victron Multiplus 24/3000/70-50. The system has worked fine for over a year, but I need a bit more ‘sun-power’ to charge the batteries this winter, and I managed to get hold of 2 x Eurener 410W – 17.4A (Imp) – 28.15V (Voc) Panels.

My intention is to connect each of the new panels to the spare MC4 inputs on both of my charge controllers… I think the math works out in terms of max volts and amps.

My question is ‘Would this intended upgrade work OK?’ I’m a bit concerned about feeding the controllers with power from slightly dissimilar panels!

Any help and advice would be appreciated.