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I would think the inverter should be connected to the battery and not ran through the charge controller.
SLA = sealed lead acid1
I would say you guys may be way over thinking this. I have a 125gal. vertical galv. tank that has been in service for over 30yrs. On the top of the tank is a “T” with 2 ball valves. One is open to air as a ‘vacuum breaker’ for draining down the tank; the other has a Schrader valve for charging the tank. Never trust a Schrader valve by itself.
On the very bottom of the tank is a drain valve for setting the water level and flushing out any accumulated sand. About a foot off the bottom of the tank is where the pump and house both connect, like with a bladder tank.
About 3-4 times a yr. I have to reset the tank as the air saturates into the water. I just set the water level in the tank about 2/3 full by the ‘touch your hand to it’ method, and pressurize the tank to my cut-off pressure. 5min. job and we’re off to the races.
BTW if you are having to re-charge the bladder in a bladder tank anymore than every 6mo.. you have a bad Schrader valve or bladder.1
Here is a pic of the switch with the cover off. two outer terminals are line (power in) the two inner terminals are load (pump) The switch is available at Homedepot. http://inspectapedia.com/water/Two_Harbors_2011_0426_DJFs.jpg
The pressure switch shown is the Square-D 9013
This is the 30-50 http://www.homedepot.com/p/Square-D-30-50-PSI-Pumptrol-Pressure-Switch-FSG2J21BP/100183740
I really hope they are able to number the individual posts at some point.