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Subject Topic: Battery Post Reply Post New Topic
09/4/2012 at 3:41pm
 Location: North Wales
 Outfit: Lunar Quasar 544
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How do you know when you need to replace the battery on the caravan?


09/4/2012 at 4:08pm
 Location: Birmingham
 Outfit: Pennine Pullman Folding Camper
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On our trailer tent we realised the stamina of the battery was beginning to get less.

It was still charged ok but not lasting as long as it used to do.

This is why we changed ours, it was 4 years old and to be honest we didn't treat it very well, only charging it before we weny away.



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Jan and Simon and Jet and Amber


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09/4/2012 at 4:27pm
 Location: Lancashire
 Outfit: Caravan now Sold
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Quote: Originally posted by sjr66 on 09/4/2012
How do you know when you need to replace the battery on the caravan?
buy a small hand meter and test it at 12.7 volts.if it maintains this its fine.letting it go down too far will not be good.

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the only silly question is the one you do not ask.


09/4/2012 at 4:36pm
 Location: None Entered
 Outfit: Coachman Pastiche
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It goes flat very quickly


09/4/2012 at 7:33pm
 Location: Argyll Scotland
 Outfit: 1997 Bailey Ranger 470 4
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Batteries are a bit like the time you switch on your car headlights in the evening.

If you are wondering if it is time to have your headlights on, then it usually is!

If you are wondering if it time you bought a new battery, it probably is!  



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Lobey.


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09/4/2012 at 8:06pm
 Location: west country
 Outfit: None Entered
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Quote: Originally posted by LobeyDosser on 09/4/2012

Batteries are a bit like the time you switch on your car headlights in the evening.

If you are wondering if it is time to have your headlights on, then it usually is!

If you are wondering if it time you bought a new battery, it probably is!  



My car turns its own headlights on. It doesn't tell me when I need a new battery though.

-------------
Steve




10/4/2012 at 12:48pm
 Location: Thatcham
 Outfit: Lunar Clubman SB 2015
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Hi you need to take the battery off and fully charge it with a seperate battery charger even though the caravan has a charger, and then take it to your local garage or parts center or caravan dealer  they will drop test the battery to check its capacity only then can you determin if the battery is ok


10/4/2012 at 1:06pm
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Quote: Originally posted by millermicm on 09/4/2012
Quote: Originally posted by LobeyDosser on 09/4/2012

Batteries are a bit like the time you switch on your car headlights in the evening.

If you are wondering if it is time to have your headlights on, then it usually is!

If you are wondering if it time you bought a new battery, it probably is!  


My car turns its own headlights on. It doesn't tell me when I need a new battery though.

it will do when it wont let you open it with the locking and then wont start,


13/4/2012 at 1:19pm
 Location: West Yorkshire
 Outfit: Elddis Avante
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Drop test only tests resistance in high current circuits (especially resistance through the battery which is relevant to engine starting scenarios). This has no relevance to it's capacity under long / low discharge conditions.
1. Fully charge the battery and ensure you get to 12.7V on a digital meter after the surface charge has dissipated.
(If it reads higher immediately after charging, all well and good but this is a false reading. You can leave it for an hour or two, or apply a heavy load briefly to bring this down. If you don't get to 12.7V the battery plates are already calcified reducing it's capacity - usually due to leaving a battery flat or semi-discharged.)
2. Apply a known load and see how many hours it takes to get down to 12.2V. Multiply the hours by current drawn by that load and you will have the capacity in Ampere/Hours of 50% discharge.
(Full discharge is 11.7V, but no need to go there, in fact it'd recommended not to. If you routinely exceed 50% your battery is going to expire prematurely, as it will if you don't recharge promptly and keep it charged as much as possible.)
Example:
2 x 25W interior lamps = 50W
50W divided by 12V (nominal) = 4.17 Amperes
Time taken to discharge from 12.7 to 12.2 = 10hrs
10 X 4.17 = 41.7 Ampere/Hours (this is 50% of capacity)
41.7 x 2 = 83.4 A/H (theoretical full capacity)
That result would be excellent for a new, quality 90 A/H battery, realistic for 110 A/H, and decent for a worn but useful 130 A/H battery.
Best battery to replace the dud with (in my humble opinion) is a standard wet-cell battery designed for tail-lift trucks or buses / coaches. These applications are designed with tough plates to start a big engine, withstand vibration, but, most importantly, can take a long slow discharge. I used to pay 50p / A/H at my local truck battery specialist for my boat domestic batteries. Lead has got a bit more expensive since though.


13/4/2012 at 2:07pm
 Location: Hampshire
 Outfit: Hymer Nova S
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Good informative and sound posting WBY



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