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Old 10 October 2009, 06:30   #11
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Mr wet, the spec suggests a voltage drop of about 2.5v @ 3 amps. Will your pump be ok running on about 10v? Just a wee thought.
It's a rule 1100 gph manual ..So.....are you suggesting the pump will run slowly?..or not work at all. I'm no expert so your wee thoughts are gratefully recieved Mr W..
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Old 10 October 2009, 18:19   #12
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Dunno how it'll perform but I'd guess it'll be rather sluggish at 10volts. Might be good trying the pump before comitting. Ifn it's not satisfactory, you could use the timer circuit to energise a relay connected to the pump.
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Old 10 October 2009, 18:50   #13
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Dunno how it'll perform but I'd guess it'll be rather sluggish at 10volts. Might be good trying the pump before comitting. Ifn it's not satisfactory, you could use the timer circuit to energise a relay connected to the pump.
That sounded great ,.. not wanting to impose but any chance of a wee drawing.
are you suggesting I run the pump at 10v? is there an easy way to alter something to supply this voltage, I've not bought the timer yet....
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Old 11 October 2009, 07:57   #14
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Can I go back to the beginning?...is the reason for your plan to remind you to switch the pump off cos you switch it on and forget it or is it to prevent you having to monitor the well to see whether it's empty? And, is the timer connected to the pump or just to the buzzer?
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Old 11 October 2009, 10:59   #15
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Can I go back to the beginning?...is the reason for your plan to remind you to switch the pump off cos you switch it on and forget it or is it to prevent you having to monitor the well to see whether it's empty? And, is the timer connected to the pump or just to the buzzer?
Correct, on the first two points,the buzzer is to remind me it's on, the well only holds so much water, so based on a timed emptying of this well by the bilge pump, it would be time to switch the pump off.

Re the third point,my plan was to connect the timer to the piezo buzzer.
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Old 11 October 2009, 18:52   #16
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Okidoke, then I gave you a bum steer, sorry. The timer will only carry the buzzer current at 10volts. If you use a 9volt buzzer it'll likely be fine.
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Old 13 October 2009, 16:12   #17
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I had a look at those,but they seem to only do-

switch on then timer delay to switch off.

I'm looking for:

Switch on - then timer delay to 'on' - Piezo.
I've fitted these to both my ribs - 4 years and 5 years service respectively with no problems.

They switch on when they detect water and then switch off 20 seconds after they detect that the water has gone.

Great piece of kit.
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Old 17 October 2009, 15:25   #18
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R-S do a varietyof timer relays that will achieve what you want and have rotary setting knobs. I use them for on and off delays on systems.
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Old 19 October 2009, 11:49   #19
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It's a rule 1100 gph manual
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the well only holds so much water,
1100GPH is just under 1.5L/Sec. To put that into perspective you could empty a 25L fuel tank in 15 seconds - I'm not sure I could do that by pouring it over the side of the boat! Unless you have a particularly large well, would it not be easier to just count to 15 or something? How long does it actually take to empty?
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Old 19 October 2009, 14:58   #20
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1100GPH is just under 1.5L/Sec. To put that into perspective you could empty a 25L fuel tank in 15 seconds - I'm not sure I could do that by pouring it over the side of the boat! Unless you have a particularly large well, would it not be easier to just count to 15 or something? How long does it actually take to empty?
I would guess it (because I've not done it) takes about 30 secs to empty the well, just enough for you to get involved in something else while you wait....and I've got a memory like a chicken.

Re the 1100;don't believe everything it says on the tin... I would say it's no more than a good healthy horse pi**
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