One of the challenges of having a not-driven-often car and using a complete system disconnect switch is that the long and short fuel trims get deleted once power to the ECM is disconnected. Not a big deal, but it may mean the car is a bit "cranky" until 1-2 cold start and run cycles are complete.
I use a disconnect switch to disconnect the main power buss but have a simple 5A circuit breaker bypass in order to protect the whole system when in storage. A battery maintainer is easy enough to do.
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