Thanks for your reply Cary. I'm in a similar situation to the OP, in that I have an off-grid system where watts is important, but with zero head. I have looked into your excellent suggestion and just want to ask you a question based on one of the findings...
If you take a look at fig.1 in the specifications for a grundfos pressure tank:
http://www.segamuhendislik.com.tr/urunler/grundfos/pdf/GENLEsME_TANKI.pdf it seems to suggest that for a pump with 40l/min flow the biggest tank advisable would be the 100l pressure tank.
Is this something you would agree with for a 370W jet pump, with a nominal head of 37m and a flow of 37l/min? Is that why you recommend two tanks? Or do you think a single larger tank could take a lower than recommended flow? If so, how large would you go?
Thanks, Mike
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