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Old 12-01-2012, 08:52 PM   #1
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Location: Yuma, AZ
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1997 Beaver Monterey Battery upgrade

Just thought I would post info about my battery upgrade.

This coach originally came with 4 12v house batteries. I wanted to put in 4 6 volt batts. So.... the tray that beaver put in my coach could only handle batts that are 6 3/4" wide.

Long story short, I went to a local big battery distributor and he took me into the warehouse and I measured a bunch of 6 volt batts. There were some that are listed as being 7 inches wide when in fact they were 6 3/4.
There were several that would fit (some with many more AH), but I chose the least expensive.

I put in 4 trojan J305E-AC's @ 200. a piece....I know, maybe a shocking price but I now have a 610 AH House battery system in a very small footprint. Compare this to 6 T-105 6 volt batteries @ 225 AH would give you 675 AH and a much bigger footprint.

NOTE: These batteries are TALL (14 3/8"), and weigh in at 83lbs.

Generally speaking, the 6 volt batts will recharge about twice as many times as the 12 volt counterparts (trojan scs225 12 volt that would have fit in the same spot for about the same price). Charge cycles for the 12 volt batts is about 350 and the 6 volt batts is over 700 times (This is based on a 50% depletion).

These are listed as FLOOR machine batteries, and I could not find another brand that makes a 6 volt battery in the Group size 921. So this will be my first experience with Trojans. Warranty is only 6/24, but I know these can last years if taken care of (700 charge cycles).

I just thought I would share this because the other option was to modify the slide-out tray. More money, and I was under a time crunch.
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Old 12-01-2012, 10:30 PM   #2
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Sounds good I am going to look into those next time I replace batteries.
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Old 12-02-2012, 09:49 AM   #3
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Interesting stuff. Thank you! I have a stack of battery info that my neighbor gave me. He's an electro-mechanical engineer (works for Eaton Corp) and did an extensive battery study. One of the documents is a 40+ page report from Trojan. I work at an RV shop and he told me that if I study all that data, I'd be the best educated battery technician in the house!
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Old 12-02-2012, 05:32 PM   #4
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You can learn a lot just by reading the Trojan product sheet, which gives complete dimensions, amp-hours at various discharge rates, RC minutes, weight and terminal type, all in a convenient chart and only three pages long for all their batteries.

http://www.trojanbattery.com/pdf/TRJ...dSpecGuide.pdf
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Old 12-03-2012, 12:11 PM   #5
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I did that T105 switch out once with 4 batts at 440 amp hours. The original two Group D 12v 440 amp hours batteries lasted 7 years.

6+ years later, I bought the Costco golf cart batteries for @ $80 for the same amp hours.

The Costco batteries have worked fine for 3 years so far and were half the price of the T105 batteries.
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