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Just to see if I understand pump efficiency, I tried to reproduce your calculations, and I found a confusing result. Maybe you can tell me what I did wrong. I can't find efficiency numbers anywhere for the Goulds 10GS05 with pump end, but I did find the numbers for the Grundfos 10SQ05-160 (at...

Thanks again.

Hi Valveman, I'm still wondering if I understand the CSV correctly. If the only water use is a single shower at 1.5 gpm, does a CSV then provide whatever restriction is required so that the pump only outputs 1.5 gpm? Or does the pump discharge also depend in some way on pressure in the pressure...

OK, thanks for your replies.

Reach4, your post gets to the crux of it. How much more power will the 1 hp pump with CSV use? (I already have the 85 gallon pressure tank, so I'm not concerned with that cost.) Using the numbers in Valveman's post (linked above), a 12 gpm pump delivering water at 1 gpm uses 8 times the electric...

Valveman, thanks for these additional details. I get it that reducing the pump discharge reduces the current through the motor, but I've been wondering how pumping efficiency varies. If the water discharge decreases proportionately more than the current through the motor, then the pumped water...

Phase 1 is complete. The Champion load management module is installed and tested; the module disconnects the 5hp pump whenever the generator turns on. I'm posting this update hoping that someone can offer advice on what pump to get for everyday use (and then the 5hp pump will be relegated to...

Thanks for your suggestions.

Yes, a pressure switch and breaker for each pump.

Thanks for these helpful suggestions. According to the manual, the load management module checks occasionally with the transfer switch and can re-connect a managed load. The problem is that a 5hp pump draws 15-25kw starting up, and my generator is only rated 14kw. Once I have the load management...

We bought a house 25 years ago that came with a well, 5000 gallon storage tank, and a 5hp pump to send water from the storage tank to a pressure tank and the house. (I believe the large pump is required to run the home's fire sprinklers and was required by code.) Everything worked fine until we...