Battery maintenance on modern vehicles

Submitted: Friday, Jul 06, 2018 at 12:39
ThreadID: 136945 Views:4883 Replies:9 FollowUps:22
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After having our original 3yo second battery load tested and declared defunct it was pointed out that in the present set up being charged with a Redarc Isolator system, the alternator will only produce maximum 12.7v or 12.8v as my Pajero computerized system is designed to ‘top up’ the main battery then quit – a fuel efficiency built into most modern vehicles. This probably explains past problems.

I thought I could top up the second battery with the smart charger on 240v and achieved 14v after a few hours. Problem solved I reckon (only have to do that now and then whilst travelling and it should retain full capacity for running the Engel.)

Next day I took two 90km runs and checked both batteries again to find they are back to 12.7v (main) and 12.9v (second) with no fridge attached so I have accomplished nothing with the ‘boost charge’.

We are heading north next week, hoping to free camp at various locations and packing 200w panel system for the van batteries, which regulates down to around 13.7v and hope to rely on the second vehicle battery for one of two Engels and am worried the battery will not cope for long with only 12.7v max charging.

Should I be concerned and is there a better plan for the battery life maintenance please?

This trip we will be checking just how long we can stay off the grid with existing gear and assess what adjustments may be required. I plan to have two 105 a/h batteries in the van, the second vehicle battery is a Bosch High Cycle Marine HCM 24-600 M4 provided by Goodchild Ent. in Cockburn. It is 60 or 70 a/h and 600cca. They steered me to this in preference to the Fusion batteries which are stated to be suitable under bonnet, but Goodchild advise ‘not for Aussie conditions’. I respect their stance on that call.

Thanks & cheers - Phil
Phil 'n Jill (WA)

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