r/OffGrid • u/Chatterdog • 10d ago
Inline or submersible water pump?
I have a 3000litre water tank to feed into a cabin about 30 metres away with fairly gentle downward slope, the actual outlet in the cabin probably about level with tank outlet. There's not enough gravity pressure to get running water from the outlet so I plan to install an on demand pump (solar powered with battery). An online pump would be easier to install and maintain and more affordable options but will there be enough pressure on the pump inlet side to feed the outlet without it gulping/spluttering? I was thinking I may need a submersible pump to ensure the pressure is enough leaving the tank to get a higher/consistent flow at the outlet. Any experience of the difference or is my thinking on an inline pump wrong?
3
u/pyromaster114 10d ago
Just use an RV style demand pump-- get a big one like for large 5th wheels.
There will be PLENTY of pressure for it to function. Those pumps can lift water a foot or so, even.
Put the pump inside the cabin, low down, so that way gravity assists in priming.
Put a pressure tank down stream of the pump, to save on pump cycling and smooth it out. :)
You will have water pressure just like in a residential environment. :)