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Home > Archive > Alternative Power sources > August 2005 > Switchable/programmable 12/24V supply?
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Switchable/programmable 12/24V supply?
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| William P. N. Smith 2005-08-07, 11:21 pm |
| I'm looking for a switchable 12/24V DC supply to run a Shurflow 9300
submersible pump at either 1GPM or 2GPM. I only need an amp at 12V
and maybe 2A at 24V, as my lift isn't that high.
I'm keeping a cistern full from a well, and depending on how many
people are in residence (2-15), I'd like to pump slowly or somewhat
faster from the well.
Ideally I'd like to have a couple of float switches, so if my cistern
is (say) 2/3 or better full it'll run at 12V, and if it's 1/3 or lower
it'll run at 24V, but I can probably settle for a manual switch.
My fallback of course is just run it on 24V all the time, but that may
draw too quickly from the well...
Thanks for any thoughts!
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| nospam.clare.nce@sny.der.on.ca 2005-08-09, 12:21 am |
| On Sun, 07 Aug 2005 21:09:09 -0400, William P. N. Smith wrote:
>I'm looking for a switchable 12/24V DC supply to run a Shurflow 9300
>submersible pump at either 1GPM or 2GPM. I only need an amp at 12V
>and maybe 2A at 24V, as my lift isn't that high.
>
>I'm keeping a cistern full from a well, and depending on how many
>people are in residence (2-15), I'd like to pump slowly or somewhat
>faster from the well.
>
>Ideally I'd like to have a couple of float switches, so if my cistern
>is (say) 2/3 or better full it'll run at 12V, and if it's 1/3 or lower
>it'll run at 24V, but I can probably settle for a manual switch.
>
>My fallback of course is just run it on 24V all the time, but that may
>draw too quickly from the well...
>
>Thanks for any thoughts!
Relatively simple set-up - you need a diode and a relay. Operate thr
relay with a float switch.
IIRC you connect the batteries in parallel - to give you 12 volts with
the relay(between the 2 positive ends, or the two negative ends -
your choice -connected, and connect the two OTHER ends of the battery
with a diode set up to be forward biased. Then connect the diode
isolated end of theisolated battery to the other end of the non
isolated battery with a diode that is forward bised when the relay is
open - connecting the batteries in serial and giving 24 volts
Battery
| |
|--||||----t------------ to load
| | | ^ Diode
|----------|
/ Switch |
/ ^ Diode
| | | |_
|--||||----|
| | |
|----------------------- to load
I used a similar setup on my Electric Fiat years ago.
Close the switch to charge at 12 volts. ( I used 24 and 48)
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