Welcome @Stinky Pete
I'm in Wellington, Boland. people call this place Hellington, few places get hotter than we get it here... I grow all year long, no aircon no inverters no batteries no generators no extra fancy shit... you just gotta be able to keep your hand on them and don't go away for more than 2 days at a time. been growing indoor for over 5 years now. it just takes a bit of flexibility and knowing what you need to do. like letting the tent stand open for an hour or two when needed. Lights aren't the issue with loadshedding, fans are, and they'll only save you from PM when the RH skyrockets during loadshedding, but if your IPM is on point then you are good as gold....
also, photoperiods are waaaaaaaaaaay more forgiving than autos, autos are really only for the guys who make little to no mistakes, otherwise you shoot yourself in the foot thinking you gona make it easier on yourself by growing autos in an difficult situation where autos themselves even in fine tuned grow room will give you problems.
whyyyyyy brother, why do that if you got a handle on organic, whyyy in the name of all that is good would you move away from organics over to synthetics? It's not 2001 anymore, "conventional" farming has got to stop, asap. we as cannabis growers / urban farmers should set the example.
do yourself a favour and provide a looksee here
F*#K SYNTHETIC FERTILIZERS, I have said this sooooo many times before, but synthetic fertilizers just shouldn't exist. and I will keep saying it for as long as it's true.