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Old 15 January 2007, 17:28   #11
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Originally Posted by al40 View Post
I guess panel must be doing something. I looked at these in Maplin and they claimed to still produce enough on a cloudy day to input something to the battery (unlike my cheap garden solar lights!).

Charging enough to run the pump in recent weeks is good going tho :-)
I also have a similar panel from Maplin - bought it in a 1/2 price sale. Just haven't bothered fitting it because it will prob just blow away and get smashed - when I look at how dark and gloomy it always is here with permanent rain it makes me wonder if we are actually in Iceland without the ice!!!

The battery is nothing special - just BIG. Bought it for my Defender but when I found out the boatbuilder had stuck a duff battery on and it's all I had around at the time. Fits the battery box perfectly and cost about 50.
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Old 18 January 2007, 06:48   #12
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"S" socket

I had been considering rigging up a caravan "S" type socket to plug in and charge at 12v when I'm towing, tucked away in the console somewhere. Has anyone else done this?
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Old 18 January 2007, 09:22   #13
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That sounds like a good way of giving your battery a top-up before using the boat.

Do you have an accessory socket on your RIB? I'm not sure on the current that the standard caravan charge sockets can deliver (may be more than the accesory socket or fuse / cabling can cope with) but that could be a possible way of connecting the cable to the RIB battery

I guess if the RIB battery was mostly charged, the current would not be that huge anyway.
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Old 18 January 2007, 12:54   #14
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0.2 amps is putting 1700Ah into a battery in a year which is the equivalent of charging a big (Td5 Discovery sized) battery from flat 15 times or about every three weeks
That sort of neglects the self-discharge rate of the battery, though. Not sure what that number is, but given that a disconnected battery will be dead (well, maybe not dead, but discharged to a non-useful state) in about 3 to 4 months, I can't see 200mA being a problem.

And, since most chargers are rated to their max current (the 200mA), and the battery voltage increases as it's charged (i.e. the battery voltage approaches the charger output voltage), as the battery charges, the amount of current is going to fall off anyway.

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Old 18 January 2007, 19:05   #15
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I had been considering rigging up a caravan "S" type socket to plug in and charge at 12v when I'm towing, tucked away in the console somewhere. Has anyone else done this?
http://rib.net/forum/showthread.php?...uble+electrics
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Old 18 January 2007, 20:02   #16
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Good idea Polwart.

If you blow the Car engine management system tho, warranty is shagged,
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Old 19 January 2007, 03:42   #17
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Not sure what that number is, but given that a disconnected battery will be dead (well, maybe not dead, but discharged to a non-useful state) in about 3 to 4 months, I can't see 200mA being a problem.
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I have no problem leaving batteries for over 4 months & still being in tip top condition!
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Old 19 January 2007, 12:47   #18
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I have no problem leaving batteries for over 4 months & still being in tip top condition!
Not saying you don't Nick, but most of the evidence points to the contrary:


from http://www.corrosion-doctors.org/Bat...lf-compare.htm

>>>>>>>>
Self discharge of batteries
Function of temperature
Self-discharge is the electrical capacity that is lost when the cell simply sits on the shelf. Self-discharge is caused by electrochemical processes within the cell and is equivalent to the application of a small external load.

Lead-acid and nickel-cadmium batteries lose their charge very quickly. For example, a lead-acid battery stored at 30oC would lose half its initial charge in about 3 or 4 months while, for nickel-cadmium, this would only take about 6 weeks. In normal use, this might present no real problem, as these types of battery can be recharged, but such batteries are clearly unsuitable for "fitting and forgetting".
<<<<<<<<<<<<

Note that I snipped stuff about other technologies, as they don't really fit the conversation.

One other site I glanced at put the self-discharge rate of lead-acid batteries at between 1 and 60% per month (nice that they're so generous.) I filed this site under "useless".

Apparently, self-discharge rate is pretty quirky, and is affected by manufacturing tolerances, number of cycles the plates have seen, ambient temperature, etc. But, it does occur.

I've got a second truck which sits in the driveway for months at a time. It usually requires a charger session before it will crank. Once started and run for an hour, it's good for a couple more months.

Hope that your system is more robust than mine.

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Old 19 January 2007, 15:23   #19
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Good idea Polwart.

If you blow the Car engine management system tho, warranty is shagged,
not my idea - i just recalled the previous discussion. but since (as I understand it from my fortunately limitted caravan knowledge) this is exactly the purpose of double electrics when towing a caravan. I can't see why it would damage the eng. man. sys. nor necessarily invalidate the warranty.
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Old 19 January 2007, 18:58   #20
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That's it then I'm off to "Caravans R Us" the morra and wearing my cunning Rogue Wave mask will purchase 2 plugs and a socket of the "S" type chuck in a fuse somewhere I did wonder if I needed a diode I'll ask my radar software mate and see what the guru says.

Where we live its at least 3 hours to the sea so it will recieve a little top up before we launch. I suppose I could use it as an accessory socket if we leave the diode out.

OK then that'll be all the cara-wacka kit and a 10 million candle power dragon beam to send morse to codders & co. Next time we are in Wales I'll look him up I might have the engine mods done to the 4.6 by the turning it into the beast.
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