Cummins 6CTA8.3 Battery Replacement

[Jeff Capretto]

Looking to replace the 5 batteries in our 2003 420 Sundance’s. In my research the 6CTA8.3’s mention 1250 CCA. Anyone here have inputs on AGM Group 31’s or other batteries recommendations? Thanks very much.

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[Roger Franklin Williams]

Yes more are less every 3-4 years. House Deep Cycle is normally 3 yrs as they are working off the inverter. Service twice a year clean and use distilled water only. My inverter is a multi-stage charger so it keeps them charged with out over charge. My older onboard charger stays off unless I have gone through a real deep discharge. Then its on only until batteries are at full charge then off. As Rob said better deal unless hard to get to.

[Paul Greenhalgh]

Roger are you saying that you replace your House and Start batteries every 3-4 years?

[Rob Schepis]

I agree with Roger on the flooded batteries. Unless your access is bad for checking/adding water or they are installed in an enclosed space, like under a cabin space, (no off gassing) then AGM might be better. Otherwise flooded batteries with proper maintenance and charging techniques (multi-stage) is IMO the best bank for the buck.

[Roger Franklin Williams]

Use 2-8D’s for house with inverter on a 42′ Cruiser and 2-31’s for T-6BTA’s 15 years ago works great. Have to replace every 3-4 years. All wet cells never found any of the considerably more costly Solid or Gel to be a good investment. Separate Gen battery.

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