Most strata insurance policies include a substantial amount for ‘lot owner improvements’. Ours covers $250,000 worth. This will cover units that have added a bigger or better air conditioner or fancy kitchen fittings etc. The solar panels are not making any difference to the cost of the insurance policy. They are just noted because they are an alteration that has been notified.
Even when our OC spent $40K on a large communal solar system over a decade ago (they were more expensive then), we notified the insurer and they did not require any change to the premium.