I'm getting a current draw of 0.2 amps on my van and have absolutely no idea where from, Does this really matter that much in terms of draining my battery, I've already posted about problems with my battery a few weeks ago. It turns out the battery is knackered so I'll be purchasing a new one but wondered how long It would take for it to drain whilst in storage with this small current draw. The new battery will be a 110ah type.
You need to find out where the draw is from? maybe the tv amplifier etc. Try disconnecting each item in turn and see when the draw drops. How are you checking the draw? is it with an inline amp meter?
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Quote: Originally posted by jennifernn on 31/12/2009
You don't want to be letting the battery drain like that. Why do you not just leave the battery clamps off, then it cannot be drained.
At a steady 0.2 amps it would theoretically be drained in 550 hours (about 23 days), but in actual fact much sooner.
Measuring low currents in low voltage systems is very difficult, it could actually be drawing more.
That's about how long it takes for our new 110amp battery to go flat. Gary advised me to put a meter in line but as I've no idea which setting to put it on, I'd be wasting my time. The only thing left on in our van was the TV amp, why that was on I've no idea because we never use the ariel.
Set the meter to DC current or DC Amps. It might be a straight line or dotted line for DC and a letter S on its side for AC. Start on a highish scale and gradually reduce to a low scale say 1Amp.
If you haven't got a meter, dab one battery lead on the terminal with the other lead connected. A small spark means there is a current drain. There should be no spark at all if everything is off.
Most vans have a DC switch on the control panel which switches everything off. This should effectively isolate the battery. If you leave it on, current will leak away through various ways.
in the motor industry a vehicle should eventually shut down with a current draw of below 0.05 amps after 30-45 minutes after switching & locking the doors so i would have thought 0.2 is fairly high but i have not checked my caravan so i am not sure.
i know this does not help but i thought it was something as a guide
Mine was delivered new with one that was wired up without the equivalent of an "ignition switch" and had an even bigger drain that you are seeing. That's while it was switched off! Rewired it correctly and it takes only a few mA to retain memories.
As an aside this little bit of kit is very worth having for this and similar jobs:
Quote: Originally posted by eddie marris on 31/12/2009
You need to find out where the draw is from? maybe the tv amplifier etc.
A TV aerial amplifier only draws about 10mA, so it's not that.
In my caravan, the "no load" current drawn is quite high too, about 120mA or so. I suspect that it is the current drawn by a relay coil in the power supply.
As discussed in another thread, one possible solution is to fit a battery isolator, if there isn't already one fitted.