Section 82 of the NSW Act allows an owner to be charged differently for insurance if their use of their lot means the insurance premium for the strata scheme is higher.
S82 (2) Individual contributions may be larger if greater insurance costs
(1) If the use to which a lot in a strata scheme is put causes an insurance premium for the strata scheme to be greater than it would be if it were not put to that use, so much of a contribution payable by the owner of the lot as is attributable to insurance premiums may, with the consent of the owner, be increased to reflect the extra amount of the premium.
So you could ask the insurer what portion of the insurance is attributable to your solar panels, or you could use your last premium as a guide (although the former amount will probably be less) then ask your treasurer or strata manager to adjust everyone’s strata fees to allow you to pay more and your neighbours to pay less, citing Section 82.