I wish we had done more future proofing., For example, we started off with a couple of panels, but the buried conduit was sized for just those two panels. Later, when we added panels increasing the voltage, we wanted to go with cable that was physically larger, it wouldn't fit in the conduit, and we had to dig it up and do it again. Simple example, but it proved to be a real disincentive delaying the upgrade to our setup.