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You do need to replace both pumps if one fails. but... it does have 2 independent pumps. If the power goes out, or the primary fails, you're still dry.
More importantly, the upside to your setup, the lead acid / AGM batteries on mine need to be replaced every 3-4 years, your battery will likely last many years.
The downside, you have a long dependency chain with a number of single points of failure.
to each their own.
It's the same number of points of failure. The watchdogs have an automatic transfer switch, a power inverter, a fuse or circuit breaker, etc - it's just all embedded in a single box instead of being parted out.
Watchdog can lose all things out of one of the following lines and still run, and it will let you know if either line fails with an audible alarm.
120v->Fuse->120v motor->120v impeller->120v float
or
12v battery -> 12v Fuse -> 12v motor->12v float
The only shared point of failure would be a crack or hole in the exit line
The 12 and 120 sides are completely seperate except the water exit path.
The 120v side doesn't get anything from the "control box," it's just a float pump.
If you filled the some faster than the 120 could pump, they'd both run at the same time. (and it would complain audibly about it)
Gotta love showing off your great work and someone coming in with “UM AKSHULLY THIS IS BETTUR”
There's a lot of variables involved in sump pump systems. I don't have any qualms with rumba's comments, they've added to the conversation.