I have a 16 inch bore 120 foot deep well with 12 feet of water in it. It is capable of pumping 100gpm continously, no problem.
It's about 300 feet from the house.
The water coop has raised their surcharge from $45 a month to $55 and we constantly have water outages from crumbling improperly installed water lines. So I'm kind of done with them.
I already have spent $900 getting the locked up irrigation motor, line and pump pulled out. Need to finish it.
I have a few 100 watts of panels from my illegal grid tie pilot array experiment and a 24v 255ah forklift battery and mppt Morningstar tristar cc.
Already plan on having at least 2 pumps for redundancy. One pump will run straight off solar power in parallel with the charge controller. The other pump will run off a the battery. The charge controller will power a relay that will turn off the pump if battery voltage falls below 21v.
The pumps I'm looking at look like they should do 1/2 to 2/3gpm with 24v and closer to 1gpm with closer to 48v.
Our water bill is for about 3,000 gallons per month.
Worst case scenario is all 3,000 gallons need to be pumped with 24v power.
So I would need 6,000 minutes at 200w.
Gives us 1.2 million watt minutes, which reduces to 20,000 watt hours or 20kwh. Per month.
My battery should be able to power 200w for 24hr straight no problem. That's about 5kwh, my new forklift battery should be able to put out 6kwh if the amp draw is under 10 amps before hitting 21v, more if the amps are lower. That should give me around 700 gallons per 24hr from that pump.
Seems like plenty of pump capacity and I only have a 500 gallon tank.
So I'm good on the battery and pump system.
I would probably set it up with float switches to relays that turn off the panel pump when full, on at around 450 gallons. Then turn the battery powered pump on at 300 gallons, off at 400 gallons.
For the direct solar to pump system I want to be able to run both pumps and still charge the battery and have enough cc capacity to utilize all the panels power to charge the battery if no pump is running.
To do that I will need 280w to run the one pump off direct 48ish volt raw panel power, 200 watts for the battery pump and want at least 200 watts of panel for the battery so the battery can absorb at least 1kwh per day even if both pumps run all day.
Ideally only the direct solar powered pump will run during the day for 100 minutes max.
Ideally the battery powered pump will only run once every few nights.
So I will just round that to 700 watts of capacity.
Then to charge the battery with 700 watts I will need 30 amps of charge controller capacity. I already have one 15 amp Morningstar tristar mppt, will need a second one.
Around these parts I should be able to make about 3.5kwh per day with 700 watts of fixed panels. I only have 200 watts of framed mono panels at the moment and a lot more frame less semi flexible panels. I would prefer to use mono panels I can rack.
If the panel powered pump runs for 2 hours during the day that should leave about 2.5 to 3 kwh for the battery, probably a bit less in the winter.
Seems over paneled but it won't be so over paneled during winter.
For backup I have my home made alternator welder, it uses and externally excited DR44G alternator converted to external rectification it can supply at least 100 amps at 30v.
Also installing rain water collection, but rain here is infrequent and unreliable.
That's just to get water to the surface.
So with a 500 gallon tank starting full, 700 gallons per day of battery powered pump water and 600 gallons of direct solar to pump capacity that's 1,800 gallons I could use in one day if I needed it. There's 1,440 minutes per day.
So 1.5 gallons per minute of pressurization capacity and a big pressure tank is all I really NEED...
Pressurization can be accomplished with a much simpler 12v based RV system.
About 6 years ago I pretty extensively dyno tested several RV diaphragm pumps. I found "1gpm" surflo pumps pretty consistently made 2L per minute, for every gpm they were rated for when ran at 50psi and drew 5 amps.
So to pressurize 100 gallons per day I only need about 17ah of 12v battery capacity.
But to pump and pressure 1,800 gallons per day I probably need a little over 300ah of 12v power.
For the pressurization system it will be at the house so it doesn't have to be 100% solar powered, I can toss a 100 watt panel up some where, small cc on a large AGM deep cycle marine battery and a 120v battery tender, all of which I already have.
But let's say I want to be able to run 4gpm for say 2 women taking a shower ( in seperate showers you dirty minded person ). I would need a total pump capacity of up to 8 gpm to hold 50psi.
I do have some Delavan and surflo plumps, maybe 4 or 5 gpm total, enough to at least get started.
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