BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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Jimny Battery
- Dogandthejimny
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- jim
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- mickt
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- muto
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muto wrote: I don't think bigger batteries need higher charging voltage. Jimny should be able to charge even 200Ah battery without issues, just slower.
I think so too. Also depends on how much you draw from it, temperature, quality of the battery and so on.
Our VW T5 is driven around locally most of the time seldom gets more than 3-5 minutes of use as most things are close by. In winter sometimes we use the Webasto to heat the car first, seat warmers, allways drive with lights on, heated mirrors and rear window all just for the five minutes of charging.
This of course leads to short battery life until couple of years ago i bought an AGM battery.
So pleased with it, no problems anymore.
Many cheap batteries nowadays does not cope with our cold weather either (Norway).
Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
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- Max Headroom
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In the past I've usually fitted an "extra-heavy-duty battery for a diesel" in every car I've had, diesel or not! I've never had a problem with batts not fully charging and I don't travel very far. But whatever you do, like Yakuza says - don't buy cheap!
In winter my car is mostly used only in the dark (go to work, return from work) and I allow the engine to warm a little without lights; fans; wipers; etc before moving off, while I check my phone messages/make calls, put on seat-belt. and don hat and gloves, I've never had a problem with a heavier duty battery not fully charging.
I notice now the cold weather has started that my engine takes quite a few more revolutions on the starter before it lights up. Last winter was the same, but throughout summer it was fine, so I might consider another battery myself soon.
Halfords is a good place to go if you have, or know someone with, a Trade card
IF IT AINT BROKE, KEEP FIXING IT UNTIL IT IS
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- TomDK
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mickt wrote: You need one that the alternator can fully charge. Buying a huge capacity battery and a standard alternator does not work as the alternator can never fully charge it.
Who ever told you this is very wrong. Alternator size has got nothing to do with the ability to fully charge a battery. Charging voltage is what matters. Especially with never type AGM batteries.
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- Dogandthejimny
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- mickt
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- TomDK
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It's a matter of doing the math. Of course you need to size the alternator to match the load.
But on a Jimny where the component that would draw the most amps would be a winch which is only used for short durations. Then it's no problem. I'm running 2x 75 Ah optima batteries off a standard alternator with not problem. Voltage is fine as it should. Even when doing week long winch heavy racing in Croatia.
So again.. There's no point in using a bigger alternator on a Jimny, unless of course you want the batteries charged faster. Or if you have a continuous load bigger than the output of the alternator. Which is very unlikely.
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- mickt
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- TomDK
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A decent quality battery is always better than a smaller one, no matter load and alternator. A bigger battery will keep voltage up far longer than a small battery.
So no , there's no point where the alternator will not be able to keep up or anything like that. Unless you have a continuous load bigger than the output of the alternator. It's that simple.
Again, I've never ever had any issues with starting my Jimny, even after very long winching sections. This is just how it is. Also why there's almost never any reason to install split-charge relays and what not.
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