The only caveats in the ZS-30A controller manual concern not shorting the connections during installation. They do suggest covering the panels to turn them off during the install. Since it was factory installed, I assume they didn't short anything and had the panels somehow disabled (probably didn't plug them into the roof top combiner), as it all seems to work.
"
- Given sufficient light solar panels always generate energy even when they are disconnected.
- Accidental ‘shorting’ of the terminals or wiring can result in sparks causing personal injury or a fire hazard. We recommend that you cover up the panel(s) with some sort of soft cloth so you can block all incoming light during the installation. This will ensure that no damage is caused to the Solar Panel or Battery if the wires are accidentally short circuited.
- Always install a battery fuse on each circuit including the solar controller
- Do not reverse connect the wires to the solar panel or battery
"
They also suggest adding a 40A fuse on the + wire runs, both in and out from the controller. Since I can't see them, I have to assume they were added at the factory. God help me if they ever pop.
