Voltage sensitive ON/OFF control for multiple loads at different voltages

[NakiKiwi]

Hi all,

I have three loads that I want to switch on and off something along the following lines:

Load 1: Inductive. 1kW startup, 150W running. Switch on at 12.4 Volts, and off at 11.4 Volts
Load 2: Inductive. 1kW startup, 150W running. Switch on at 12.6 Volts, and off at 11.6 Volts
Load 3: Resistive (element). 1500W continuous. Switch on at 13.8 Volts, and off at 12.8 Volts

The options I have thought of so far include using three separate inverters that have adjustable on/off voltages, or using voltage-sensitive programmable relays of some sort.

Any thoughts from your expertise and experience would be most appreciated.

[inetdog]

A simple programmable controller with an analog voltage sensing input may be the most straightforward way to go.
If that seems to be overkill, you could use six voltage sensitive relays, or three voltage sensitive relays with adjustable hysteresis. If you can find such beasts. You will probably need three power relays to actually switch the load if the voltage sensing relays do not have that power capability.

[Sunking]

Not sure what the point is because with the exception of Load 3, the other two you want turned off long after the battery is already dead at 11.9 volts. Taking it down to 11.4 volts just makes sure you destroyed the batteries. Kind of like shooting you enemy in the head after a battle to make sure he is dead.

[inetdog]

Kind of like shooting you enemy in the head after a battle to make sure he is dead.

At least it confirms that you are still alive.

[bcroe]

I have three loads that I want to switch on and off something along the following lines:

Load 1: Inductive. 1kW startup, 150W running. Switch on at 12.4 Volts, and off at 11.4 Volts
Load 2: Inductive. 1kW startup, 150W running. Switch on at 12.6 Volts, and off at 11.6 Volts
Load 3: Resistive (element). 1500W continuous. Switch on at 13.8 Volts, and off at 12.8 Volts

The options I have thought of so far include using three separate inverters that have adjustable on/off voltages, or using voltage-sensitive programmable relays of some sort.

Any thoughts from your expertise and experience would be most appreciated.

If you are running a 12V battery, how do inverters fit in? 12VDC isn't too hard to switch on
& off with MOSFET transistors. Bruce Roe

[Sunking]

At least it confirms that you are still alive.

Well I do shoot my LiPo batteries with a .22 through the heart, and then to make sure he is dead drown him in a bucket of water overnight before I toss it out for the Buzzards and Jackals to clean up.