We want to lift 200-300 gallons a day 16', into an attic storage
> tank that is ~ 200-300 gallons, from a rain fed cistern.
> I need to spec the pump, preferably 12Volt, so I needs Watts
> and current.
> All we need is round figures, due to inherent inefficiencies.
>
> 1 gallon weighs 10#'s =A0 , =A0 (# is the pound symbol).
>
> 1 hp ~ 1000 Watts ~ 500 foot # / sec
>
> 100,000 secs in a day
>
> Lets take 250 gallons up 16'/day, that's about 40000ft #/day.
> (16' x 250 gallons x 10#/gallon =3D 40000 ft # /day).
>
> Now what I do is convert to ft #/sec by dividing by 100,000
> to get 4/10 ft # /sec.
>
> =A0From the 4/10 ft #/sec I can convert to hp & Watts using the
> above, (1kw =3D 500 ft#/sec) to get,
>
> 0.4 / 500 =3D 0.0008 hp =3D 0.8 watts .
>
> Watts =3D Volts x Current, so now I go to 12 volts and get a
> Current of 60 milliamps.
>
> I'm wondering about using solar energy to power the pumper.
> Thanks, (anyone who cares to correct is certainly welcome).
> Ken