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Old 07 August 2013, 16:22   #11
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Quote:
Originally Posted by Amcarrapatoso View Post
If I leave the boat on the water for a long time, I will use the cover, but just for one or two days...

Thanks for the note about the battery capacity.
I fitted one of these last year great little pump i put mine on a switch so it can be turned off when the boat is not in use it kept the boat dry the last time i left the boat on mooring over a few days & night at Oban RULE 500 12v Bilge Pump 25S - FULLY AUTOMATIC - | eBay
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Old 08 August 2013, 10:51   #12
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Some automatic pumps have built-in switches, others start every few minutes to check if there is water.
Any comments on pros and cons of the two approaches? Reliability, battery usage?
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Old 08 August 2013, 11:07   #13
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The ones with the built in switches tend to be bigger to house the float switch, but will only pump when there is water present - so won't drain your battery on 'standby' (unless it's raining/seawater getting in so it's pumping anyway).

The electronic auto ones that switch on every couple of minutes to see if there is any resistance (i.e. water to pump) tend to be smaller, but can drain your batteries, even if it's been dry, if left for a sustained period.

I like the electronic auto ones - they take up much less space - even if it did flatten my battery once.

Edit about reliability - all 4 of mine are the electronic (no float switch) Rule 800 gph auto pumps, 2 are 8 years old, 1 is about 3 years old, and 1 has been on the boat for about a week. The ones that needed replacement are the deck pumps - so get used more than the two in the engine box.

D...
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Old 08 August 2013, 13:53   #14
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I have answered this thread before. But I must advise that I had two rule matics and they both ran my bats down and did not last a season. Went back to a rule 1100 and float switch plus the best set up IMO

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Old 08 August 2013, 14:44   #15
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with a float switch, approx how much pumping are we talking to kill a battery?
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Old 08 August 2013, 14:49   #16
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Rule auto lasted six years. Ran the bat down once, but I had two batteries. Loved it..very simple.
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Old 08 August 2013, 16:28   #17
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with a float switch, approx how much pumping are we talking to kill a battery?
Depends on your pump and your battery.

Assumptions: small pump like this: RULE BILGE PUMP 500 GPH 12V - Rule Electric Bilge Pumps - RULE BILGE PUMP 500 GPH 12V - Rule Electric Bilge Pumps - Discount Marine Chandlery and Sailing Equipment. Bargain Boat Spares and Clothing
Will pump 500 gal/h
Draws 2.1A
You'll probably find starting draws more power and pumps less so if on and off a lot then it may be less.
So if you have a 100Ah battery you can only really run it it to about 40% of that before the voltage drops too low. So you have about 60Ah. That means you've got less than 30hours of pumping. Then depends how much water you are shipping. A big wave would easily be the quivalent of chucking a gallon bucket at you. Will depend on the hull and where you are moored etc. If that happened every minute you'd be shipping 60gal an hour. So you'd probably be pumping for 9minutes in every hour. So you'd keep pumping from a fully charged battery for 200 hours at that rate... So just over a week. And thats not in a major storm...

If there were no waves or leaks and just rain.... Assuming you have a 6m Rib x 2m Wide so have a 12msq (120,000 sq cm) free surface. Last year we had an average of ~1300mm rain. 1mm of rainfall is 1litre over a msq. So 1300mm is 1300litres per metre, so 15,600litres over the boat --> ~ 4000 gallons So I don't think there is a major problem with rain alone... Even if you had a months rain in a day you'd get 400gallons so only an hour of pump running which would only use 2Ah of battery...
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Old 09 August 2013, 15:27   #18
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Quote:
Originally Posted by ShinyShoe View Post
Depends on your pump and your battery.

Assumptions: small pump like this: RULE BILGE PUMP 500 GPH 12V - Rule Electric Bilge Pumps - RULE BILGE PUMP 500 GPH 12V - Rule Electric Bilge Pumps - Discount Marine Chandlery and Sailing Equipment. Bargain Boat Spares and Clothing
Will pump 500 gal/h
Draws 2.1A
You'll probably find starting draws more power and pumps less so if on and off a lot then it may be less.
So if you have a 100Ah battery you can only really run it it to about 40% of that before the voltage drops too low. So you have about 60Ah. That means you've got less than 30hours of pumping. Then depends how much water you are shipping. A big wave would easily be the quivalent of chucking a gallon bucket at you. Will depend on the hull and where you are moored etc. If that happened every minute you'd be shipping 60gal an hour. So you'd probably be pumping for 9minutes in every hour. So you'd keep pumping from a fully charged battery for 200 hours at that rate... So just over a week. And thats not in a major storm...

If there were no waves or leaks and just rain.... Assuming you have a 6m Rib x 2m Wide so have a 12msq (120,000 sq cm) free surface. Last year we had an average of ~1300mm rain. 1mm of rainfall is 1litre over a msq. So 1300mm is 1300litres per metre, so 15,600litres over the boat --> ~ 4000 gallons So I don't think there is a major problem with rain alone... Even if you had a months rain in a day you'd get 400gallons so only an hour of pump running which would only use 2Ah of battery...
Wow, wasnt expecting that! great answer, thanks very much!
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Old 10 August 2013, 20:18   #19
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Anyone tried the Water Witch electronic switch?

Looks to be promising from the description and it is used on lots of foreign rescue boats so I guess it is well thought of. Plus it can be easily added to an existing pump.
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Old 11 August 2013, 16:09   #20
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No - but I changed a float switch which lasted a season for the Whale sensor switch (no moving parts) and it has been very reliable so far ...
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