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Voltmeters


John_T
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Cobblers!!....just fried my split charge system causing the second battery to go flat! :( My winch is hydraulic so it wasn't that, maybe it doesn't like the amperage the TD5 alternator pushes out. I have just ordered a proper spilt charge kit from X-Eng but it won't be here till after Xmas....must remember to shut the manual isolator switch off in the meantime.

My next plan is to fit a voltmeter to let me know if the second battery is getting a charge. I run things like the coolbox and kettle off the second battery. Is it best to use a small relay fired up by an ignition circuit to get it working or is there a better way bearing in mind I don't want it "live" all the time? When the system is charging and the batteries are linked what will the gauge tell me about the main battery?

If I have got this idea round my neck has anyone a better idea of how to monitor the charge to auxiliary battery?

Thanks

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If I have got this idea round my neck has anyone a better idea of how to monitor the charge to auxiliary battery?

If your split charge connects the two batteries together, the voltage accross each will be the same, so a voltmeter won't tell you much about the charge of the 2nd battery.

You could connect a voltmeter to the 2nd battery via a "Push On" momentary contact switch, pushing the button with the split charge switched off will give you some idea of the charge of the 2nd battery.

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To monitor my 2nd battery, I fitted a voltmeter [or battery condition gauge, genuine LR part PRC7315] wired through a ignition controlled relay, to shut the gauge down when the vehicle/engine is switched off, connected like this [4 terminal on/off relay]

batterygaugerelay.jpg

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Better than that!

If you can find a Land Rover VSS (Voltage Sensitive Switch) which is fitted in series with the rear de-mist on 90/110s and probably others as well. It is a yellow box, bit like a relay with four terminals and VSS on the side. They are about £90 new, but you can pick them up easily as sodbury & the like from people selling old relays for 50p

It monitors the voltage of a battery on two of the terminals and if the voltage drops below about 11v, it opens the contacts of a built in relay.

Connect one of the relay contacts to battery positive and the other one to your fridge etc and forget about it.

If the battery gets too low - it will switch the fridge off.

A gauge is fine - but it won't help you if you leave it on over night (unless you've taken to sleeping in the driver seat and waking up often). Personally, I wouldn't bother!

I have a VSS in a plastic box with a pair of lighter sockets and use this to power my cool box etc.

Never a flat battery have I!

Si

P.S. Cheers for the order!

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Better than that!

If you can find a Land Rover VSS (Voltage Sensitive Switch) which is fitted in series with the rear de-mist on 90/110s and probably others as well. It is a yellow box, bit like a relay with four terminals and VSS on the side. They are about £90 new, but you can pick them up easily as sodbury & the like from people selling old relays for 50p

hmm, I reckon it is possible to make something that will work in the same way using a relay, a zener, transistor and a resitor for less then £4.... but if you wanna pay me £90, I can may 2 for ya :lol: (might even be possible to squeeze it iinside therelay casing)

as an aside, I have been looking at gutting a maplin £4 voltmeter use as a small panel LCD voltmeter thingie...

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