How much spare space do I need in a switchboard?

All inverters below are hybrid models

	direct solar	with additional solar inverter	blackout/backup/eps	3p energy meter
SkyBox 1P (CT)	1	+2	+2	+3
SkyBox 3P	6	+3	+3	-
Sungrow 1P	2	+1	+1	+3
Sungrow 3P	7	+3 (3p inverter)	+3	-