Installing a 48v 5KVA Inverter/CC solar system

For your 2s x 2p array, you can use the 4-1 combiner cable assembly. No fuses needed.

And for the 6 panel array, you could go with 3s x 2p connections, and still use the same 4-1 combiner (and no fuses either).

There are lots of details, but from a wiring point of view, 3s x 2p is more efficient as the array is higher voltage and lower current--Allowing for smaller wire diameter (and less voltage drop/power losses due to wire resistance).

Your MPPT charge controller may be slightly more efficient at Vmp~60 volts, vs Vmp~90 volts--But not a huge issue (charge controllers tend to "run hotter" when running at higher Vmp-array voltage--Generally only talking about 1% or 2% difference in losses--Something you would never see/measure).

And it appears that it is good match to your inverter/solar charger... Also, less current in wiring and 6 mm^2 wire would be OK. The MPPT function of the solar charge is like an automatic transmission--As long as the input power (from the engine) and the speed of the wheels (current? my metaphors are failing--Or think of a 10 speed bicycle where you match your feet against the speed/torque of the wheel, up hill, flat, etc.)--The MPPT controller "matches" the input power to the output power. Excluding losses, when maximum charging current is required for the battery bank:

• Power = Voltage * Current
• Vmp * Imp (from solar array) = Vbatt * Ibatt (power into battery bank)

The computer in the MPPT controller takes care of the computations/operation of the "down converter" to balance solar array Vp/Ip and the battery Vb/Ib charging requirements.

-Bill

If you do 2s x 2p or 3s x 2p, you do not need the breaker box (2p connections without fuses/breaker/breaker box is safe). Some folks like to install a simple breaker or power switch (rated for DC current and voltage, AC ratings do not map to DC usage) so they can turn of the panels when working elsewhere on the system.

-Bill