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How long can a battery last?

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Jerry atric View Drop Down
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    Posted: 09 Apr 2017 at 10:46
After the battery stopped charging on the T3 Cali I spent the journey home fretting over how long it could keep running with no charge. Wiggly amps knowledge has eluded me all my life so could one of you more intelligent people out there give me some idea please?
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2017 at 11:48
Ah but do you know how long the piece of string is?
 
Depends on the capacity of the battery, how fully it was charged, and the load.
 
But assume it's the standard-ish 30AH, and the ignition takes about 4 Amps, divide 4 into 30 and you get the number of hours before the battery is totally flat, assuming full charge to start with.
In practice it will be less than half that because things stop working when the volts drop too much, and then add occasional use of the indicators and brake light.
 
Of course if you had the headlight on too it would be less than half again.
Brian.

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red leader one View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2017 at 12:26
So the piece of string is about this long then.
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2017 at 13:55
Originally posted by Brian UK Brian UK wrote:

Ah but do you know how long the piece of string is?
 
Depends on the capacity of the battery, how fully it was charged, and the load.
 
But assume it's the standard-ish 30AH, and the ignition takes about 4 Amps, divide 4 into 30 and you get the number of hours before the battery is totally flat, assuming full charge to start with.
In practice it will be less than half that because things stop working when the volts drop too much, and then add occasional use of the indicators and brake light.
 
Of course if you had the headlight on too it would be less than half again.


= 7.5 hours is theoretically possible but don't turn any lights on, disconnect brake switches, and only use hand signals.


"Chicken nuggets don't dance on a Tuesday."
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2017 at 17:02
7.5 hours would render the battery totally flat, zero volts. The ignition will stop working long before you get to that.
Brian.

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Jerry atric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2017 at 20:38
Thanks very much chaps. I did turn the lights off and resorted to and signals but had no idea how long it would power the coils for. I've printed off the generator thread from here so will commence my diagnosis tomorrow.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2017 at 20:51
often wire off or fuse ..... check earths and wires
The Older i Get, The Better I Was
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Jerry atric View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2017 at 07:51
Thanks Ken. I will be following your guide
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