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Old 04-23-2007, 06:14 PM   #15
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Dick, the AGM's are in fact standard on the LADB.

I "guess" it was me that mentioned the chassis batteries as I wanted to clarify that only the coach batteries were being replaced.....
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Old 04-26-2007, 03:57 AM   #16
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Hi John, The amp hours you speak of should be 660 on a MADP. 6 x 220 = 1320 @ 6 volts series to 12 volt = 660 amp hours @ 12 volts.
Mine has 8 house batteries each 220 @ 6 volts adding up to 880 amp hours capacity.
So..... how much amp capacity are the AGM's?

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Old 04-26-2007, 04:30 AM   #17
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Peter, The calculation made by Scott at NT for the AGMs is identical to yours (6 x 220 / 2 = 660 amp hours). With 660 amp hours and an amp draw of approx 47-50, we should get approx 12-14 hours of use. The lead acid batts produced 110 amp hours or approx half that of the AGMs.

I'm not an engineer and I did not stay at a Holiday Inn Express last night so my aparent knowledge is only as good as my memory of listening to someone who is.
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Old 04-26-2007, 05:35 AM   #18
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John, I thought the MADP had the same Interstate, I believe 2200 series batteries the same as the EXDP. They are rated at 220 amp hours at 6 volts.
Test it unplugged at the same load as you did before and see how long they hold.

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Old 04-26-2007, 05:37 AM   #19
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Also I notice there may be enough space at the rear of the main slide tray for possibly two extra batteries, that would give me 10 house.

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Old 04-26-2007, 06:22 AM   #20
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Hi Peter, don't recall the make or model of the old batts but Scott at NT told me they were rated 110 amp hour. (Brand separation?) I plan to test them soon and I'll let you know the outcome.
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Old 04-26-2007, 08:12 AM   #21
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I think Scott is wrong. They were 220's @ 6 volts. 110 is too small, I don't think Interstate even makes them that small.

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Old 04-27-2007, 07:05 PM   #22
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Typically, when making these "how long will it last calculations" most battery manufacturers will say to use one-half of the rated amp-hour capacity for a more meaningful calculation. I suspect that is where Scott got the 110 amp-hour number (half of 220). The real differentiator in amp-hour capacity is battery size not battery type.
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Old 04-28-2007, 06:57 PM   #23
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Jeff, That could well be true, but the AGM's also require recharging at about 50% I believe and don't come in anything more than a 220 ah (20 hour rating) for a motorhome application. To my knowledge they will last longer, in life, not recharge differential.
Additionally there can be charge limits of a maximum of 14.0 volt sustained. High voltage can damage AGM's and high charge rates can over heat the main engine altenator. They must require a special regulator be installed on a unit that was wet cell before. It is not just a battery change. I would hope they knew that if in fact it is true.

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Old 04-28-2007, 07:49 PM   #24
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Absolutely Peter. The AGM charge profile is quite different than a flooded. If you have AGMs please make sure to set you charger appropriately. If your charger can not be set for AGMs you'll need to correct that or you'll stand a pretty fair chance of ruining the AGMs or charger (be it inverter, converter, or alternator).
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