Connecting multiple batteries and charging

(1) yes

(2) makes no difference

:)

Hi Tim,

The quick answers are Yes and Yes. You need the two batteries in Parallel so that they operate as a single battery system and you then connect the Ctek to one positive and one negative terminal.

If you use the Ultimate forum you will also find lots of us who have improved the original battery setup.

You might need to check the capacity of your Ctek charger. With 210 Ah you could be using a charger with decent capacity. I use the 25amp Ctek.

Cheers

Peter
Ultimate No 10

Tim,

yes, pos to pos and neg to neg, that's correct for a parallel configuration.

Also yes, to your second question.

Be aware that some chargers have problems switching back from the boost to the float voltage if their rated current is smaller than about 10% of the battery capacity.
So in your case the charger should be rated at least 20A.
Even though your charger might be rated high enough, it could miss the switch over condition which could lead to battery overcharging - if there were loads connected during charging and/or the battery temperature was higher than say 35 degrees.
Better chargers have an overriding adjustible timer which limits the boost charging stage, effectively negotiating the affect of load currents, temperature, and battery capacity on the switch over condition.
Read more aboutcharger recommendation

For any other questions, just do a 'follow up' to this, or use the notification form inside the linked page.

Best regards, Peter