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As above

transmission losses for DC systems are greater, and you will be limited to the amount of stuff that you can power - but if it really only for lighting, and people wont want to add extra stuff once they have the power (which is pretty common), DC will be fine - over short distances.

One disadvantage of AC is that if your PV is 24 VDC, then there is the cost of the inverter to give you 230 VAC.