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Old 08-08-2010, 09:56 PM   #1
Rivet Master
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Indiana , Pennsylvania
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Intellipower and Battery Replacement

Well it looks as if we cooked our battery the last weekend we were out camping. This was after replacing the Univolt with an Intellipower 9100. Surprisingly the PO stuck a KIA automotive battery in the Airstream. Needless to say, we are replacing the battery. Here is the question: do I need to match a certain group battery (24/27) with the Intellipower. Or do I just find the style and size I prefer? What is the difference between a group 24 and 27? Thanks!

WBCCI 4871

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Old 08-08-2010, 10:39 PM   #2
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Do you have the ChargeWizard to go with the 9100? If not, get one.

There is no need to match a converter to a battery. The charge currents are limited by converter voltage and wiring resistance so heating should not be a problem. All wet cell lead acid batteries charge with essentially the same voltages so you only need worry if using an AGM, maybe.

Use what will fit. Buy from a reputable retailer who offers a good warranty, sells a lot to folks who use batteries like you do, and will stand behind what he sells.

A group 27 is a bit bigger than a group 24 so it will provide a bit more energy storage. Figure about 10 to 15 usable (about half total capacity of the battery) watt hours per pound of battery. A group 27 is usually rated at a bit over 100 AH or 1200 watt hours. A group 24 usually runs about 80 AH or a bit under 1000 watt hours.

Keep in mind that things like temperature, cycle to cycle variance, age, and use profile can each vary available energy capacity by more than ten percent. What this means is that differences of that size don't mean much when it comes to choosing between batteries.

Watch out for those pushing hype. There is a lot of misleading information out there when it comes to batteries. If you can't measure it, don't give it much weight.

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Old 08-09-2010, 09:04 PM   #3
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Thanks Bryan. Ordered the Charge Wizard for the 9100. Will also be purchasing a new battery. I am looking at a Diehard deep cycle marine battery from Sears. They have one the exact size as my old battery. Thanks for the input!

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Old 08-09-2010, 09:15 PM   #4
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Ask about the AH rating as you dig into the 24/27 difference...
Interstate offers 2 different group 27' at 85 AH and and one at a just over 100 AH

Ask me how I know...

I own 3 @ 85 AH
Hi Ho Silver RV! Vernon, Sarah, Mac the Border Collie -
A honkin' long 34' named AlumaTherapy
and a 26' '63 Overlander, Dolly
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Old 09-07-2010, 05:11 AM   #5
Silver Loon
2007 31' Classic
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Smile Inteli-Power 60 Amp Converter/Charger - 9200

The 9200 comes with a charge wizard. I am upgrading the converter on my 1999 Safari. Camping World lists this converter as "Campers Choice."
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