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Old 27 August 2011, 15:26   #11
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Hehe! Polwart you need to get out more! You put a hell of a lot of work into that and fair dues!

I still think (optimistic or not) that he'll be ok especially as the boat will get SOME use I hope.
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Old 27 August 2011, 15:32   #12
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As you've only an 85Ah battery, I'd definitely fit a charge controller as 10w is a shade over the 10:1 ratio.

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Old 27 August 2011, 19:58   #13
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Small solar panels are a waste of time. Some customers at work who run a few Discovery Td5's bought solar panels to leave in the windscreens when they were away to keep the batteries charged. To put that into context a D2 draws about 30ma when it is sitting with the alarm armed. The folks went away for about two months, came back, batteries absolutely flat. A D2 battery will last about a month with no solar panel!

I was always intending to get one to keep the boat topped up but might as well use a hamster in a wheel IMHO...
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Old 27 August 2011, 21:17   #14
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The Rule won't draw much when it is not actually pumping water. The 2 second pulse it does every 2 mins draws only a tiny amount.
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Old 27 August 2011, 23:35   #15
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Can you get a 12 volt hamster?
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Old 28 August 2011, 02:50   #16
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The Rule won't draw much when it is not actually pumping water. The 2 second pulse it does every 2 mins draws only a tiny amount.
Except if you work out what it actually uses in 2s repeatedly, it adds up. The experience of others here would seem to support this.
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Old 28 August 2011, 03:34   #17
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Originally Posted by Polwart

Except if you work out what it actually uses in 2s repeatedly, it adds up. The experience of others here would seem to support this.
Spot on Neil they ate a total drain!!
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Old 28 August 2011, 05:12   #18
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Spot on Neil they ate a total drain!!
B
Same here on the yacht. I wired a small 500 auto pump directly to the battery so it couldn't be turned off accidentally. A month later one 110 amp battery completely flat and the bilges are dry so it wasn't pumping anything.

Having fitted a new battery the bilge pump will go back in via the battery master switch as the yacht is dry.

We also have a 45w solar panel fitted. This gives about 10 AH a day for most of the year (Dec and Jan excluded). Max output would be about 15AH but this means tilting the panel and avoiding any shadow which is tricky with a mast and rigging. There is a quick calculation to give an approximate idea of the amp hours a 12v panel will give in ideal conditions. Divide the panel wattage by 3 = the amp hours it will generate. Panels do get hot and this reduces the efficiency. Mount them up on the A frame with a flow of air under them for best results.

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Old 28 August 2011, 07:02   #19
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What about a wave powered bilge pump used in conjunction with your solar powered pump? I've no idea how good the wave powered pump would be but I like the thought of a belt and braces back-up.
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Old 28 August 2011, 07:28   #20
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What about a wave powered bilge pump used in conjunction with your solar powered pump? I've no idea how good the wave powered pump would be but I like the thought of a belt and braces back-up.
Saw one of those at Seawork this year, genius
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