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Constant Voltage Pump Drivers - FAQ
The following is courtesy of, and copyrighted by
Solar Converters, Inc.
How do they protect the pump from the well going dry?
There are 2 methods of dry control. One is to use a dry switch hooked to the dry switch input to close when the well is dry. This type of switch is on the market and is basically a floating ball in a cylinder.
On the larger units, the main dry control is the current monitor on board. When the pump runs dry, it is no longer pumping water, hence the motor load drops and of course the motor current drops with it. The unit senses the drop in current and turns off the pump motor for 20 minutes. This protects the pump, and the 20 minute wait allows the well to refill with water. After 20 minutes the pump turns on again and pumping continues.
Is there a float switch control to turn the unit off when the holding tank is full?
Yes, both styles are supported. On the smaller unit, connecting the yellow wire to the black power wire shuts the unit off. On the larger units,by moving the terminal block connection the pump will turn off if the float switch closes, or it can be setup to turn off if the float switch opens.
What if the battery goes low?
These units have their own internal LVD (Low Voltage Disconnect) that shuts off the pump if the battery voltage is too low. This is used to protect the battery from low discharge damage.
Is the battery fused?
The 12/24 V unit has a fused battery. The higher power units require an external battery fuse.
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