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Old 29 October 2007, 18:13   #1
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Marina Berth / Bilge Pump / Trunk Question

I have recently put my Ribcraft 5.85 in a marina berth. I have just been searching through past posts on bilge pumps and battery flattening problems. My set up seems to be an on/off arrangement with no automatic option as currently wired.
In my ignorance I thought I wouldn't need the pump on automatic anyway. I thought that if I left the elephant trunks down that the worst that could happen is that the well at the transon would fill up and anything over this level would empty via the trunk. Am I missing something here? I am doubting myself beacause the nice people at the marina phoned me after a torrential downpour here on the weekend to tell me that they had lifted my elephant trunk up because the boat was filling with water via the trunks.
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Old 29 October 2007, 18:19   #2
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Is your trunk above water when it's down?
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Old 29 October 2007, 18:25   #3
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I have seen small auto bilge pumps powered by a solar panel on top of the a-frame ... seemed to work well. Not fast but works given the length of daylight
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Old 29 October 2007, 18:33   #4
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Our Rule pump is an automatic one. It flattens the battery if we leave it on.

So we don't.
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Old 29 October 2007, 19:01   #5
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when the boat is at rest and dry I think that he bottom of the trunk hole is level with the waterline
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Old 29 October 2007, 19:09   #6
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...I thought that if I left the elephant trunks down that the worst that could happen is that the well at the transon would fill up and anything over this level would empty via the trunk.
Given your last post about the trunk level, when some water flows in and fills the well, as you suggest, the stern will then be heavier and lower the trunk deeper into the water. Consequently, you'll get more water in there than you anticipated.
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Old 29 October 2007, 19:35   #7
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Given the buoyancy of the tubes I hoped it wouldn't drop much. I think what I may do next time I am at the marina is put a hose in the boat with the trunk down and see what happens if I keep filling ie if the water finds its own level and where it is. I really don't fancy having a flat battery every time I get to the boat or fannying around with solar panels!
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Old 29 October 2007, 19:44   #8
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We get far more rain than most. My boat also has a huge deck area and no cover - in 1 day it is possible to collect about 1,000L or 1 tonne of water!!! I have a 120amp/hr battery and even when we have had loads of rain the battery will last about 2-3 months.

The pump is an auto Rule 500 and if it doesn't have water to pump draws negligible current - would probably last about 8 months or more.

To give you an idea on solar Panels our local Tesco has the whole roof covered in them - cost 2 million and today when it was fairly sunny for the time of year they were generating 3kw. It will take them 300 years to break even....

I have a 5w panel which I have taken off as it was next to useless. It would be great in sunny weather - but you don't need the pump then!!!

The best answer is a cover.
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Old 29 October 2007, 20:04   #9
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Quote:
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Given the buoyancy of the tubes I hoped it wouldn't drop much. I think what I may do next time I am at the marina is put a hose in the boat with the trunk down and see what happens if I keep filling ie if the water finds its own level and where it is. I really don't fancy having a flat battery every time I get to the boat or fannying around with solar panels!
Might be worth adding a float switch in the well (assuming that's where the pump is)-at least then it'll only pump when it needs to rather than the 'load/no load' auto pumps going off every few minutes.
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Old 29 October 2007, 20:07   #10
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Might be worth adding a float switch in the well (assuming that's where the pump is)-at least then it'll only pump when it needs to rather than the 'load/no load' auto pumps going off every few minutes.
The auto pumps aren't a problem - mine will last for ever like that - it's when it has to pump out a tonne of water a day the trouble starts!!!
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