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neal_at_sea avatar image

What size cables for IP22 battery charger?

Hi I have just purchased an Blue Smart IP22 Charger 30A (3) to use in my camper van. I was wondering what size cables should I install to charge the batteries? One battery is <1m away and 12V 75Ah, the second battery is about 4m away and 12V 100Ah. Also I guess it should be Ok to just ground the negative to the chassis?

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2 Answers
JohnC avatar image
JohnC answered ·

Pardon me Paul for just adding a little clarification for all the diy'ers out there. I'm sure you mean mm2, and the suggestions fine. Each batt in practice is unlikely to see more than 0.2C (Pb's, charge only), so 15A for the first and 20A for the second. The IP22 terminals can handle 13 mm2.

Take care though Neal when buying 'auto' cable. The roll may say a mm2 which includes the insulation, the wire actual size much less, so look to the 'fine print'.

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Paul B avatar image
Paul B answered ·

1 meter away one 6mm MIN the 4 mtr away 10mm


no harm in using 100 mm for all of them

if you are not concerned with a little bit of volt drop at full amps the 6mm for the 4 mtr run is ok as well, (it will get warm (not hot) when charging 30 amps)

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