Wiggo
regular
Reged: 10/09/2003
Posts: 3467
Loc: (State, Country, etc.)
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Quote:
Wiggo has grasped the technical niceties of the situation...
Fridge uses 5A, works about 25% of the time so uses about 30AH per day - 100AH battery should last 3 days, if you get over 2 days [ 48 hours] with the lights, water pump and everything else you are doing well.
Thanks for that! The only thing I would point out is that you will never get 110Ah out of a 110Ah battery (more than once). The best you will get is more like 50Ah - if you take any more, you risk discharging it to the point where it won't recover. As you complained about being too techie, I will avoid going off into my usual alternator controller sermon.
And thanks for the computer fan tip - how much difference did that make?
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The nicest thing about not planning is that failure comes as a complete surprise, and is not preceded by a period of worry and doubt.
Nereid Charter
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Kawasaki
regular
Reged: 21/06/2004
Posts: 4621
Loc: Anglesey Wales
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Hey up!
Thanks for the Post Chris.
Some good replies, as usual.
Solved a batt/ fridge prop I,ve had.
Pray tell, why disconnect the shore power?
Skinflint or what? 
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Jerk of all trades. Expert in none.
Plus Don,t do serious, lifes too short.
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oldgit
regular
Reged: 06/11/2001
Posts: 7338
Loc: Medway
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You should be able to get a couple of decent batteries for a sensible price if you shop around.When my domestics recently died after giving sterling service for over six years,leaving us lightless miles from home ,was quoted over £160.00 quid + VAT each from one of the big chains,fortunately they were out of stock and we had to look further afield.Eventually found two decent quality 115A jobs at £80.00 + VAT each.
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Take5
regular
Reged: 19/10/2007
Posts: 753
Loc: DONT TAKE LIFE TOO SERIOUSLY -...
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Nothing to do with me but I have used them for car batteries in the past, purely because they are cheap.
batmanuk website
There is also a "Power Calculation" infosheet you can download from this site. here
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halcyon
regular
Reged: 20/04/2002
Posts: 2824
Loc: Cornwall
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Sounds like surface charge, and they are not being charged correctly.
How does the generator charge the batteries.
Have you checked them with a hydrometer ?
Brian
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Kddpowercentre designers and purveyors of fine charging systems for 30 years.
Powercentre spares and help line
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Medskipper
regular
Reged: 20/12/2001
Posts: 1646
Loc: Surrey
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Hi Chris,
You don't say what amp hour the batteries are? are they for example 100s 120s etc?
Gwylan answer is about right, but I would take issue with his 25%! Its more likely that the fridge works for 40-50% of the time, particularly in warm weather! all depends on how often you open it for things! i.e. cold air falls out when door is open and motor comes on to replace the warm air you just let in!
It all a matter of maths really, just count up the amps being used! Also if for example you have a 100.amp battery, the useable power is only about half of this i.e. 50amps, so if you have two you have about 100 amps to use. The light which you describe sounds as if it could be a 20 watt bulb.
Barry
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alrob
regular
Reged: 19/07/2005
Posts: 825
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second batman - bought quite a few over the years - next day delivery - good advice over the phone as well
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Hurricane
regular
Reged: 11/11/2005
Posts: 1686
Loc: Sant Carles de la Rąpita
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Surely you dont mean warm beer - Graham?
Perhaps a better solution is to fill the fridge to the brim
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And then ration it.
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leadersail
regular
Reged: 30/11/2005
Posts: 156
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Add EDTA+ to the battery, this is a cleaning agent used in industry to clean heavy metals that will clean off the sulfate during charge and will release the sulfate back into the sulfuric acid during discharge.
It continues to recycle the battery for the whole life of the battery.
Batteries will last 7-8 years instead of 2-3.
Can be added any time, brand new or one 2 years old off the battery dump !
http://www.courtiestown.co.uk/batteries/shop.htm
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Best not take this post too seriously, I'm only here on my Doctor's advice as part of an ANGER MANAGEMENT THERAPY.
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ChrisKaye
regular
Reged: 26/08/2004
Posts: 597
Loc: Wiltshire
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Thankyou everyone for your replies
"Why disconnect the shorepower".....well I was just testing it back at the pontoon berth to see how long the batteries lasted for without shorepower
"How does the generator charge the batteries" I think the generator must charge the batteries as we can get another 4hours battery life after running the generator
"Have I checked them with a hygrometer" the bloke tells me that he has and they are OK and holding charge but admitted that this is the limit of his knowledge.
Not sure of the amp/hours they are very difficult to get to, you have to be the size of a jockey to get at them, so that counts me out, luckily bloke looking at them is smaller and thinner.
Thanks again for everyone's input, I am just going to get him to replace them with good quality new ones and with just a bit more amp/hours than they have now and see how we get on
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