Let's say you have land for a 50kW PV array using 250W modules this would be a 10S 20P array. Control if no batteries would be to drop off parallel strings until charged. I dont know how the control strategy works with these Chademo DC controllers. Does anyone? when not in use we cannot export to the grid as it is a SLER system limited to about 20A max. A mains powered Chademo is impossible need three phase. SWER is single line earth return. S is series P is parallel.