Re: Issue with AC and DC Pumps off Solar Electrical system
Your problem is most certainly in the plumbing, not the power system. As has been suggested, be your own plumber or find one who knows something other than conventional well pump systems.
If you have gravity feed into the house, you should only need a tiny little pump to pressurize your P-tank system. I second (or treble) the note about not enough tank. Tiny tanks lead to rapid cycling. Also, pumps generally like to "push" water better than "pull" water.
If I understand you basic system correctly (which I may not) you have gavity to the house. I would plumb the intake to the pump (making sure that line from the gravity tanks is big enough, given the distance, at least 3/4" and ideally 1 or 1 1/2 if it is a long run with lots of elbow or other restrictions). I would then run it into at least a 50 gal P-tank. (A 50 gal tank will deliver ~30 gallons of water) I would set the tank 20-40 or perhaps 30-50 psi. The extra pressure won't make any difference in the "feel" or volume of water, nor will it deliver much more water without the pump cycling, and it takes significantly more power to pump that last 10 psi.
PS I personally would only install a bladder tank. They never get water logged, you never introduce air to the water system. To use any other type of tank is like trying to drive the Indy in a Model A.
PPS Your demand water heater will perform much better once you get the water pressure stabilized.
PPPS If you have gravity feed, I think the ac jet pump is way more pump than you need, and it therefore may not be a very efficient installation. I have run single cabin systems on tiny little shurflo pressure pumps, that draw as little as ~5 amps, drawing water out of the lake, lifting it ~15' and pumping it into 20-30 psi.
I'll stop now.
Please note, being a moderator does not add any weight to my opinions 300 watts Siemens/BP panels,plus a Sun 90,, making ~400. ~30 amps into Rogue MPT-3024, 450 ah of Trojan T-105, Morningstar ts300 inverter, a Tri-Metric meter.a collection of antique generators, plus 2 Honda eu-1000i's (also a BS2512 IX controller) and assorted other stuff!