I wasn’t happy with pumps with built-in 120VAC float switches operating line voltage pumps, if there’s a power outage the system is down which can lead to flooding very quickly. I wanted a system which could operate from batteries in case of a power outage so I changed everything over to a 12VDC system using two boat bilge pumps, a T3-TB controller and some stainless steel float switches.
One of the pumps is a regular DC bilge pump and there is a second pump, a large Seaflo 12V DC 4700GPM as a backup and in case of floods. The system operates off a 12V car battery which is charged by a trickle current battery charger.
The T3-TB manages the system, there are three float switches wired directly into the inputs of the T3-TB. When the water level reaches the lowest float everything is off. The middle float switch brings on the smaller pump and the highest float brings on the larger pump.
A manual override switch runs both pumps in case of an emergency, regardless of the state of the float switches.
I used variables to manage the floaters and counts how many time the pumps ran. At the end of the day, the counters are reset to zero.
I harvest variable values through modbus with my plc to obtain statistics and to send emails in case of troubles (no drainage in a day, emergency pump ON, etc).
And voilà !
Feel free to comment.
Update of April 22: As you can see, the 20th was a horrible day (rain++). The pump ran about 250 times this day and removed about 2500 liters !