Should have provided more info:

Here's the deal: Guardian has 4 units from 8Kw to 17.5 Kw which are LP powered. There is a digital control system which is hardwired into specific breakers in the panel. When the voltage goes below a certain level, the genset kicks in (kind of a home-style Watchdog deal). It is programmed to go on every week, needed or not for a self-diagnostic test and runs for a bit. It is recommended to have 2-100 gallon LP tanks (which we need for other purposes anyway) in order to have extended use.

It also comes with a transfer switch to avoid back-feeding once power is restored.

What could possibly go wrong?