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A Query For The Knowledgeable 12 Volt Charging Experts.

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Old 13-06-2013, 14:08   #1 (permalink)
JJ
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Default A Query For The Knowledgeable 12 Volt Charging Experts.

Ok.

Here goes.

I have solar panels wired up through a posh regulator thingy to my leisure battery bank.

I have the engine battery wired up to the alternator.

And I have a clever Sterling battery to battery charger. This is connected to the leisure battery(s) and the engine battery.


As I understand that the B2B charger detects the voltage in the leisure battery and the engine battery.

When you start up, the B2B can tell if the leisure battery needs any charging and proceeds to let the alternator do so once the engine battery has been fully charged.

If the leisure battery is full it just "floats"... letting a small current keep it topped up.

Ok... here is the query...

If the sun is shining the panels put a voltage around 14 volts across the leisure battery terminals. This is the voltage of the panels and is there even if the leisure battery is flat. So surely the B2B charger will read this voltage and "think" that the leisure battery is full and therefore not allow the alternator to pump in loads of amps and charge it up quickly.

Does my B2B only work to the maximum when it is dark?

JJ
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Old 13-06-2013, 14:15   #2 (permalink)
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yes . i find it works abit like that.
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Old 13-06-2013, 14:24   #3 (permalink)
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Yes JJ it does.

To get over this, you need to install a relay so that when you start the engine, the solar panels no longer charge the Leisure Batteries.

Otherwise, when driving along the road, the B2B will never read properly because the Batteries are being charged by the Solars.

However, it will not mean it doesn't work and doesn't charge the batteries, it just won't do it how it should.

The above makes me sound real clever,,, but, When I fitted mine Jonandchell explained it and fitted the relay, also dropping out of the Fridge to stop that creating a circuit within a circuit.
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Old 13-06-2013, 14:27   #4 (permalink)
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Has your trusty Kipor broken down
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Old 13-06-2013, 14:29   #5 (permalink)
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Haggers my friend... I have to confess I did not have you down as the Funster most likely to come up with the answer and solution...

I apologise...

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Old 13-06-2013, 14:34   #6 (permalink)
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Quote:
Originally Posted by Snowbird View Post
Has your trusty Kipor broken down
Which Kipor do you mean Dave... I have so many...

Anyway... some people are "Belt and Braces" folk but I am a "Belt and Braces AND Bailing Twine" man.
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Old 13-06-2013, 14:36   #7 (permalink)
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Quote:
Originally Posted by JJ View Post
Which Kipor do you mean Dave... I have so many...

Anyway... some people are "Belt and Braces" folk but I am a "Belt and Braces AND Bailing Twine" man.
What, no WD40?
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Old 13-06-2013, 15:04   #8 (permalink)
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Lightbulb

I was given the same info' by the chap who carried out my last habitation check .....
... his simple solution (not yet done) was to fit a switch between the solar panel and regulator which should be off whilst traveling.
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