Must say I enjoy your website and value the information given.
I am trying to build an energy efficient house – too far away to get a grid connection. I am trying to find out what pump to buy for my system. Our appliances run on 240V – 50 hz
I have a 24V battery system with a whisper H100, 10 solar panels and 6 X 4V batteries and an inverter. I collect rain water (ok – in New Zealand) and it drains to a couple of tanks that are about 40 ft below the house level and 240 ft distant.
Our plumber has insisted to go with a mains pressure system so that we have good showers (no bath due to not sufficient rain for these) and so I have purchased the correct shower heads. Given that I cannot change this part of the system what sort of pump do I go with?
1. A DC pump with a reservoir so that once the pump is on it pumps up to a certain pressure – turns off and then only comes on again once a minimum pressure is detected? (Would I observe surging in the shower if this was the case?)
2. A DC pump with no reservoir that would come on every time a tap was turned on – in this household it would be 80 to 100 times a day?
3. If a DC pump is recommended could you indicate a model or give some indication as to what I should ask for? How should this be connected to the system? Direct to the batteries?
4. An AC pump + reservoir?
5. An AC pump with no reservoir?
Thanks for your time.
A standard well pump will kill your small solar power system and really small battery bank. Check out what I designed for another off grid family with limited solar due to mountains blocking most of the southern sky.
You should use a small 24 VDC solar Jack pump down in the lower cistern, which draws very little power since it pumps very slowly and is only filling a storage tank inside your house. This holding tank has a second 24 VDC pump but this one is a pressure pump and will pressurize your homes piping system just like a standard pumping system on the grid. Note that we have a sand filter on the line entering the holding tank, and an ultra-violet light filter and carbon filter on the pressurized line leaving the holding tank. This allowed drinking the water as it was tested as being free of all bacteria and other bad things even though the water source was a nearby river.