Establishing The EPEVER Photo Voltaic Charge Controller

I'm simply now entering into photo voltaic energy. I put in 4 one hundred watt solar panels on the roof of my store, direct sunlight all day. I wired them in collection. My pump home is about 30′ from my store. Inside the pump home I put in four new 6 volt golf cart batteries linked in collection for 24 volts. I have 4 water pumps in this pump home: a 220v A.C. submersible pump, a 110v A.C. above floor pump, a 12v D.C. pump, and a failsafe hand operated pitcher pump. I need to ensure that we will never be deprived of water. I am confused about how to connect the 12v D.C. pump to the batteries, or directly to the EPEVER charge controller. I saw a video on YouTube that includes a man who connected his small 12v D.C. water pump directly to his cost controller. He used the last 2 connections on the right side of the underside of the controller for this, adverse wire to the damaging screw, and positive wire to the positive screw. When i measure the voltage across these 2 screws with my multi-meter, I get a reading of 17.7 volts. Is this okay? Is this voltage okay for offering power to a 12 volt pump? At Portable Power Station , I ran a wire from the adverse contact on the pump all of the solution to a unfavorable publish on one of the 6v batteries. Then I ran a wire from the optimistic post on the pump to at least one facet of the contacts in a stress change, after which connected the opposite aspect of the contacts in that stress switch to an on/off light switch, and from there to a constructive put up on an adjoining 6v battery to supply the 12 volts needed for this 12v pump. I checked this arrangement with my multi-meter and it read 12.3 volts or thereabouts. The 12v D.C. pump ran high-quality at first. But now, after solely less than about 12 hours of operation, and a number of other months of sitting idle, this pump sounds pitiful and only puts out 20# of stress instead of cutting off at 40# like it’s purported to and did at first. My multi-meter shows that instead of 12.Three volts as at first, there is only 5.7 volts of current between the 2 posts that this pump is connected to. Have you learnt what might have brought on this problem? Could it be associated to the fact that the batteries are linked in collection, such that, for example, the destructive publish that the negative contact on the pump is linked to is also linked to the optimistic publish of the adjoining battery. Ought to I've Lead-acid batteries linked to the underside proper screws on the controller as an alternative of to the batteries like I presently have?