In a two-pump, battery-backed sump system, how do people avoid excessive power draw when the battery charger and primary pump want to run at the same time?
I'm imagining a post-hurricane scenario: The sump basin continues to refill with water when the grid power is finally restored. At that point, the primary pump and the battery-charger will both want to run at the same time.
I assumed people would solve this by using some kind of intelligent power switch, that only gives power to the battery charger when the primary pump isn't running. But I haven't found anything like that on the market, so I assume that's not a typical solution.
So how do people avoid this problem? Is it as simple as providing as 20A circuit instead of 15A?
(My question is similar but a little different from this one)