Sorry for the hijack, but i just bought my first caravan :) and it has a car battery on it, im assuming they dont last anywhere near as long as a leisure battery as this shot down with only 1 light on.. pretty sure its knackered anyway, and i will be getting a proper leisure battery at some point. Just thought i'd ask as may get one earlier rather than later
car starter batteries are more lightly built than leisure batteries.. its about how deeply they are cycled..
if the caravan spends its life plugged into the mains (most now seem to) a car battery will do the job..
it really does come down to how the battery is going to be used.. all batteries will wear out quicker with deep cycles.. lightly built car starter batteries will wear out quicker than the more heavily built leisure battery..
you battery is well and truly knackered.. you might as well buy another one now..
apart from the fancy meter the only way to test a batteries true capacity or its wear out state is to fully charge one put a known load on it and see long long it takes to go flat..
for example my 180 amp hour truck batteries should have been able to run the vehicles headlights (a ten amp load) for close to 18 hours.. in reality they only managed 5 hours.. its not a question of being knackered its more a question of how knackered.. yours sounds like its 99.9% knackered.. not a deal of use and you might as well not have one.. he he
trog
Post last edited on 17/10/2014 09:44:13
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"for example my 180 amp hour truck batteries should have been able to run the vehicles headlights (a ten amp load) for close to 18 hours.."
That is not the case, for example,a good quality 50Ah battery, fully charged and in good condition, will supply a load that draws 50 Amps, for only 30 minutes. The same battery, would supply a load that draws 1 Amp, for 50 Hours, or a load that supplies 2 Amps, for 25 hours.
saxo1
Thanks.. had a feeling it may of been the case.. It is only a small battery so i doubt it is that big.. but as you say if im on EHU then should be ok for now, especially as im in testing mode with the first caravan to see if i like it :) Already spent a fortune, so it can wait a trip or 2
"That is not the case, for example,a good quality 50Ah battery, fully charged and in good condition, will supply a load that draws 50 Amps, for only 30 minutes. The same battery, would supply a load that draws 1 Amp, for 50 Hours, or a load that supplies 2 Amps, for 25 hours.
saxo1"
yes the greater the load placed upon the battery the less you get out of it simply speaking..
battery capacity is actually measured over a twenty hour discharge.. 200 amp hour battery with a ten amp load exactly matches this..
my 180 amps ant far out.. very close to the 20 hour discharge time period used to measure capacity..
i am trying not to be over technical.. but just for you..
divide the batteries capacity by twenty.. lets say a 100 amp hour battery.. put a 5 amp load on it.. this will give the technically correct twenty hour discharge..
dont be daft and use a 100 amp load for one hour.. its a silly example and potentially dangerous.. :)
Quote: Originally posted by trog100 on 17/10/2014
mine cost £50 quid (china price) takes around ten seconds to test.. and i am pretty sure it would also say your battery is knackered.. he he
trog
may well do,but i know ours are proper industrial quality and are accurate.I suppose its like greggs ovens and domestic ovens.One is s**t and the other is not.You cannot test a battery in 10 seconds without knocking the crap out of it
yes you can but we will have to differ on that.. :)
plus of course i dont have £800 quid to spend on something i dont really need.. but as my son said.. it will only tell you what you already know.. the fact it does also tells me its working..
these things test inductances and the like.. they put no load on the battery and do it no harm.. connect it up.. tell it what type of battery thats being tested tell it the rated cold start performance press a button and in seconds it comes up with some answers..
i believe those answers (within reason) and the low price is because it came from china and is made for the chinese/asian market and not an over priced western export market..
prices go up when things arrive in this country get marked up by a couple of hundred percent or so and VAT added.. stick a western brand name on my £50 quid meter and the price would soon go up to £300 quid plus..
but ether way it works and does a grand job.. you can believe what you want to believe.. he he..
Quote: Originally posted by trog100 on 18/10/2014
yes you can but we will have to differ on that.. :)
plus of course i dont have £800 quid to spend on something i dont really need.. but as my son said.. it will only tell you what you already know.. the fact it does also tells me its working..
these things test inductances and the like.. they put no load on the battery and do it no harm.. connect it up.. tell it what type of battery thats being tested tell it the rated cold start performance press a button and in seconds it comes up with some answers..
i believe those answers (within reason) and the low price is because it came from china and is made for the chinese/asian market and not an over priced western export market..
prices go up when things arrive in this country get marked up by a couple of hundred percent or so and VAT added.. stick a western brand name on my £50 quid meter and the price would soon go up to £300 quid plus..
but ether way it works and does a grand job.. you can believe what you want to believe.. he he..
trog
Well i do agree with you on the cost thing.I also dont have £800 to spend and even if i did i wouldnt,thats a good few batts you can buy.The testers i use belong to the company i work for.My next purchse will be a lock n level.seems the only easy way for a twin axel.
I am just looking to replace my Bosche 110ah but I do need to use the mover setting off from home and on return to get it back up the drive. We usually just use hook ups so from that point a small battery would suffice. Can anyone advise on consumption approx of movers.We have a short but sloping drive and 1650 Kg to get up it?
they rate a mover as using around 20 amps while its on the move..
a 110 amp battery fully charged equals two or three hours of actual moving..
if you start off fully charged.. spend ten minutes moving the van.. ten minutes is a lot.. you will take no more than 5 amps out of the 110 battery.. it will still be very close to fully charged..
if you go straight to a hook up site spend another ten minutes moving the battery will still be 90% charged..
movers are not the slightness problem if hook ups are used at both ends..
my comments only apply to a new-ish battery that really is close to 110 amp hour.. most peoples batteries are not new-ish and that is where the problems start..
i am beginning to sound like a bloody battery salesman.. he he
trog
ps.. if your tow vehicle is charging the van battery a short journey will soon bring it back up to fully charged..
I had a Numax 110 ah battery which was over 10 year old but due to me overfilling it when topping up and putting on charge I knackered it.
I used it on three differen vans so I reckon the less you pay the less it will last.
If you purchase a new one dont buy the cheapest you can find, but a good leisure make like Numax but not less than 85 Ah and you will find it will last you years if kept charged and topped up every winter when van not in use donot allow to go flat