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Old 12-01-18, 11:41 AM   #1
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Default Disconnect battery - consequences?

Hi,

I often travel and don't use my car for a long period of time (months). So I would like to disconnect my battery to prevent it from being completely flat when I return.

Now I'm wondering if I will run into problems when I reconnect it again. For example, would there be a problem with the car alarm? Or would the car be immobilised for another reason? Can I start the car by myself (one person) after disconnecting?

Any other complications I should be aware of?

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Old 12-01-18, 11:48 AM   #2
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Is the car kept on a drive/ garage or on the rd side?
Personally i would use a trickle charger to keep battery topped up, rather than disconnecting.
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Old 12-01-18, 11:49 AM   #3
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Buy a trickle charger. I use one usually over xmas when the car is on the drive for weeks at a time.
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Old 12-01-18, 11:51 AM   #4
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No trickle charge is not possible, unfortunately
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Old 12-01-18, 11:52 AM   #5
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You don't have electric to plug it in to?
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Old 12-01-18, 11:53 AM   #6
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Quote:
Originally Posted by xlineiain View Post
You don't have electric to plug it in to?
No, car is on the street.
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Old 12-01-18, 11:59 AM   #7
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Get a solar charger. Maplin do one, no idea if it's any good though. Might just trickle enough to be able to start the car after being sat for a while.
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Old 12-01-18, 12:47 PM   #8
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There are some really good solar trickle chargers now.
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Old 12-01-18, 01:28 PM   #9
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A solar trickle-charger is never going to work for this purpose. A simple calculation and quite some experience with solarchargers teaches me that.

Take for example the Maplin panel. This has a maximum rated current of 225mA, meaning in bright sunlight with the panel aimed exactly towards the sun that is the maximum you would ever get under perfect conditions.

However, under glass it would only be a fraction of that. And when not aimed perfectly at the sun it's a fraction of a fraction. And when it is overcast it would be only a few percent of that (good luck in England).

Suppose a 60Ah battery discharges within 2 months, that means you need to replenish 1Ah every day. Suppose you had 8 hours per day to do that, that means the panel needs to give you on average 125mA (=56% maximum rated output) during these 8 hours. Absolutely no chance! You can play around a bit with the numbers but you won't get anywhere near what is required.

So back to the question in the OP. I hope somebody has the answer.
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Old 12-01-18, 02:54 PM   #10
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Hi

I imagine many factors would be in play examples if when you stopped using the car it had very dirty filters and oil that would not help

The biggest issue I would be concerned about would be the ecu not retaining codes for the immobiliser and radio if the battery was off for an extended period
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