An Electrical Alternator is used on a duplex pump application where automatic electrical cycling of the pump is desired for added protection in residential or commercial applications. With one pump operating to handle normal flow, a second pump becomes operational in the event the water level continues to rise. The built in alarm system, a standard feature, can be connected to sound when the second pump becomes operational (3 float switch system) or independently (4 float switch system). All electrical systems must be installed by a qualified electrician and according to the National Electrical Code (see section 430-71 through 430-113, plus any others that apply).
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Comments about Electrical Alternator Duplex Control Panel (NEMA 1 Enclosure):
My basement could flood very quickly without a working sump pump. Battery back up pumps can't handle enough water and batteries tend to die when you need them. Two sump pumps can fit in the sump, but one tends to run whenever needed and the other sits waiting for the first to fail. The stand by pump may be unable to run after a long period of inactivity.
The duplex control alternates between the two pumps. If one fails, an alarm will sound and the other will handle the flow.
This is a well designed piece of industrial equipment. It uses relay logic which is not as flashy as some electronics, but is much more tolerant of voltage spikes that frequently accompany violent storms.
The instructions strongly recommend installation by an electrician. There is a lot of wiring to be done; it is not as simple as plug & play. Two different electrical circuits allow both pumps to run simultaneously and allow one to run if one of the circuits is off. I made a slight modification to power the electronics through a transfer relay so that the electronics will still function if either of the supply circuits is live.
I strongly recommend an automatic standby generator to power one of the circuits.
If you want to fool yourself into a feeling of security, buy a battery powered backup. If you REALLY need to keep your basement dry, get this duplex controller and an automatic generator.