Hi All, ok. So I had a off grid system installed at container home and was told at the time that running a transfer pump as in submersible would be detrimental to batteries. Would a small referidgeator booster water pump be acceptable?
CLD
Respectfully, I'm going back to the beginning, the beginning is always where anyone should start...
So you need a pump of some sort... Apparently submerged in liquid?
Since your power supply is solar PV, which produces current in DC... Why not a DC pump instead of AC through an inverter with inverter losses?
Think "Direct Drive" instead of conversions with the losses involved in conversion?
I've been off grid for over 30 years, made a crap load of mistakes...
My first well pump was AC which worked with the AC generator I often needed to back up my puny solar system.
When the solar system was handling almost 100% of electrical needs, and my inverter let the magic smoke out (again, a mistake on my part), no water until the inverter got replaced...
Which got me thinking, I produce 100% DC power, run that through an inverter to make AC (with substantial losses), while there are perfectly good DC pumps available... And I could have water even though I didn't have AC with the inverter out...
So I have DC well pumps now. On a timer to fill pressure tanks they run during peak sun hours where the panels power them directly, or I can push a button and run them at night to fill tanks as needed... if not, they just wait until the timer kicks in during peak sun hours.
My point is, why not a DC pump directly off panels/batteries without inverter losses. Much more efficient...
And of this is a sump pump (most submersible pumps are well water or sumps, so I'm assuming here), why not something like a boat bilge pump? Cheap, effective, DC out of the box, etc.
If its a potable water pump then spend a little more bit about every pump you find has a DC equivalent... and in all different voltages.