Backyard Aquaponics
A place to discuss aquaponics

I guess your test results confirm what I wrote in my original post:

The flow would have to be measured at each head to confirm this,
but the results seem to indicate that the pump you tested is designed for higher head than we all need.

(Where on earth are the propeller pumps?)


I plead guilty:
in all equations in my original post, I should have inserted the word "measured", because that is only what counts:

so let me rephrase:

should have read:
pump effect (kW) = measured head (bar) * measured volume (l/min) / 600
pump efficiency (%) = pump effect (kW) / measured energy input (kW)

measured head (bar), measured volume (l/min), measured energy input (kW) all occurring at the same moment

greetings

frank

Hydro
Interesting, I did not get any amp varn by head. Only time it dropped was with no water. Either way Frank appears to be right.
Well unless anyone else wishes to give it a go its either no amp var'n with head or drop.

This thread has gone away from it's original purpose and should probably be split out as half the pages are talking about pumps but not what was originally asked for.

I wouldn't normally say anything but I couldn't find the info that I wanted

So while I'm here......

Are the smaller Jebao pumps (ie Jebao WP1500) that specifically say



Any good for aquaponics or should I move up to say the Jebao 4000 and just use the xtra pumping power to provide aeration via a T join thingy?

The little pump will become blocked (the strainer is too small), they dont move much water for the amount of watts consumed. Even the 4000 ( I use a very similar pump) is not efficient and will become blocked over time. They also dont last very long. If you get 12 months you are doing well.

Try to find one that has a ceramic shaft too.

If $50 is your max sort of price - the 4000 is probably the best for you.

I would probably rather pay $75 now than pay $50 twice if you now what I mean.

Maybe just grab one from B and return it under warranty every 11 months

hmmmm - I like your style but I don't think 12 month warranties work that way...the warranty is from the original purchase date

Quality pumps start at over $100 - Just buy a couple of the $35 ones off ebay (sunsun).

here is link to a very interesting site that tells all about pumps:
http://www.pumpschool.com/

have fun

frank

being as i will have 1000 gallons both on FT and GB. i think im going with gas powered trash pump. i have so many trees that leaves are an issue no matter what i do except build another building

i had one of these years ago and back then they were about 115.00 dollars i know we put well over a 1000 hours on it and they were not friendly hours. i know this will do larger solids that i will generate and even leaves
if they get picked up somehow thru intake screen

they were very efficient on fuel use too. i had rather have a 12v solar pump but that cannot be done for under 200 dolars im sure.

here is link to pump http://www.duropower.com/item.asp?PID=22&FID=8&level=1

Johnny

That is a direct coupled pump, it will eventually leak through the seals. Corrosion resistant may be a little iffy and I would question its ability on continuous use.
I have quite a few small 2 strokes, and properly looked after will last many years, I would just be hesitant on using it for AP

i understand now after further reading. i was just thinking it would be good choice as my local power comapny cant keep the juice going when the sun is shining much less when we have heavy weather

and that one will move a lot of water but ill continue my search. maybe even a 220v external as i just realized i do have a 220 plug within 50 feet of the FT

That would be three phase in the USA?
Efficient motors not had one on a pump, over here its 440v and I don't like working on them. Been zapped a couple of times by 240v but at least I'm still alive.

How would you plan on turning it on and off?

Nah: 2-phase....I think. We have 120V for most things and add opposing circuits to get 240V (sometimes called 220V). Higher stuff is occasionally used: I have a neighbor who lost his twin bro working on an elevator when a nit un-taped the circuit breaker and turned it on.

Hydro. If your only running 120v does it mean you have to have thicker wiring to handle more amps to get the watts?
Sorry for getting off topic but it has always puzzled me.