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Old 15 November 2006, 15:30   #21
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One of the drawbacks of living in Wales no sun
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Old 15 November 2006, 16:11   #22
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Originally Posted by codprawn View Post
No I meant it uses 4 to 5 amps of current per day in total or to put it another way 48 to 60w -
Eh? I thought you were a physicist? "A per day" would be the rate at which a current changed (and whilst it is a legitiamite unit - it essentially has little to with battery drain). Likewise watts are measurement of "instantaneuos" power consumption.

If you are saying that the pump uses 60 watts of power when working, and when it is wet it is working 24hrs a day - then you are saying that your (12V) pump draws 5 amps of current when it is turned on. That is 5 Amps, 24 hours a day - i.e. 120 Ah = given that a 120Ah battery will be nackered after reaching 50% discharge - you can only run this pump for 12 hours on battery power.

Even assuming its not pouring constantly and your pump only comes on for 2 hours in total each day. And assuming you over estimated the current/power consumption - and it is say 1.9 A as per the manufacturers spec for the cheap rule 500 GPH pumps then you will be using 3.8 Ah per day then you MIGHT get away with leaving the boat like this for a week or two at a time. BUT this is going to be really cycling the battery hard - and assumes that you can run the engines hard enough to completely recharge the battery every time you are there.

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of course these are very approximate figures as rainfall is rather erratic to say the least!!!
not here its not - its just heavy and constant!
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Old 15 November 2006, 16:20   #23
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It is NOT working 24hr a day flat out even when it's raining!!! When the pump had stopped working the heaviest rain we ever had took about 40mins to pump out the following day. So you can say it runs for no more than 40mins a day in total.
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Old 15 November 2006, 17:00   #24
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Slight problem is the only time you need one is when there's lots of rain - bilge pumps don't work very hard on nice sunny days.....
Solar cells generate a certain amount of power on even dull days - the rural telephones here are powered by solar cells and they are running a transmitter all the time! It is just a case of doing a few sums to figure out how much juice is needed - the solar cells we use on the farm fence energisers are 30w and I bet that would keep the battery topped up even in a monsoon
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Old 15 November 2006, 17:05   #25
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Today we had about 3 hrs of proper daylight.....

I bet in Iceland they wouldn't be too good in the winter!!!
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Old 15 November 2006, 17:55   #26
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Today we had about 3 hrs of proper daylight.....

I bet in Iceland they wouldn't be too good in the winter!!!
I bet in Iceland you wouldn't go out in an open RIB too often in the winter

Also if the water in the boat is frozen, you might find the pump struggles a bit

Another option would be a small wind turbine like you find on a yacht, though I don't know how RIB-proof it would be when on the move.
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Old 15 November 2006, 21:41   #27
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I was thinking of getting one of the vertical type wind turbines - no shore power on our pontoons.
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Old 16 November 2006, 03:32   #28
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One of the drawbacks of living in Wales no sun

Is that the only drawback that you can think of?
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Old 16 November 2006, 07:55   #29
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Is that the only drawback that you can think of?
Well considering how many English people have invaded us lately there must be something going for Wales - most of them swear they will never return either!!!
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Old 16 November 2006, 12:05   #30
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From the Rule website: Auto function pumps, current draw while sensing:

AMP HOURS PER DAY
0.20 (500)
0.25 (1100)
0.35 (1500)
0.60 (2000)
0.67 (3700)
0.76 (4000)
1.52 (8000)

They apparently have 2 wiring schemes; fully auto pumps which require power and ground only (I assume switching it on puts it into auto mode; no manual on mode available), and one with a 3-wire setup (manual on/auto.)

On the 2 wire setup, there is no way to disable the auto function except by removing power to the pump.

On the 3-wire setup, well, if the pump works, it has to have 12V and Gnd, so the third wire will be your culprit.

www.Rule-Industries.com willhave the info you need (though it's not exactly easy to find...)

jky
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