WWW: My second Nemo 24 volt DC solar pump failure
Channel: WCGWdotBLOG
Date: 2021-09-21

My second Nemo pump failed. What Went Wrong?

---EDIT 10/6/2022---
Some months later, my impression is that Nemo's pump design is sound, and if you need their flexibility and their limitations fit within your use, get one. But note that they don't deal with power supply problems well on their own. If you've got a battery and a functioning LVD, you should be good.
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It stopped running while filling a 50 gallon tank. When I pulled it up, it was dead, and full of water. This is the same failure as the first one.

The manufacturer says it is likely due to the power supply failing to provide enough amperage, the windings heating up, the air in the pump heating up, and then pressure causing the seals to pop. This seems feasible.

I also think it is possible that one the seals failed, creating a very slow leak.

In any case, my wire crimps don't seem at fault! (Small victories)

Since this was the same mode of failure with the same aftermath as my last pump, I think it's clear that either:
A. My Chinese power supply rated for 3x the needed current couldn't actually deliver the needed current, resulting in heating of the air in the pump body and the pressurization as predicted by Nemo. This would also make sense given how short of a time this pump lasted.
or
B. Nemo's pumps are junk. (I don't think this is the case)

I tend towards A... as I've ordered another pump, but a regular 120VAC pump this time to avoid issues of power supply.

Critique my installation of the pump here: https://youtu.be/dRLuQknjSLI