In an ideal world the advice would always be if you are running a twin system use two controllers. It will give you better results as you can control each pump separately and even have different flow rates and poles set up on each system.
The controller is designed to work with one pump ideally a 100psi 5.2Ltr per minute Although it will work with a higher rated pump. The Controller has a range of built in protection systems
1. Fuse
2. Diode to protect against reverse polarity
3. Over Current management
1. The liquid logic is also rated up to 10 amps and has a 7amp fuse,you need to look at the maximum ampage of your pump when running flat out X this by 2 if you exceed this the fuse will blow.
We recommend a the fuse supplied is always fitted.
3. The liquid logic also has a built in safety shut down If it detects current (amps) above 7.5A it will shut down to protect itself and display the message OC = Over Current.
As Spruce rightly points out 2 pumps will draw twice the ampage so you need to take this into account. Every system is different set up to individual requirememts - However in testing we find a 100PSI 5,2ltr per minute pump will draw between 3 and 5 amps so double the high end and the controller will shut down (provided it is fitted as per our instructions)
Also the higher current draw per hour of two pumps will reduce how long each charge will last.
Provided the controller is fitted as per the manufacturers instructions and the fuse is in Line (on the positive red cable) between the battery and controller.
It is possible to run two pumps with one controller But you will have to consider the point above + the DE calibartion will have to be adjusted with both poles running. Otherwise you will find that Dead ending one pole and pump will shut down both pumps.
Also You will need to consider it may effect flow rates to both poles .
Bottom line is the controller will do it, However the controller is designed to work with one pump and you will risk overloading the controller. Advice is get another controller its well worth the investment to have a back up and additioal protection on your system.
- I would suggest you think about a charging controller that has a split relay built in or get an auto electrician to fit a split relay.
Remember though even with a relay the alternator will only trickle charge a leisure battery while the engine is running
Ian
