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Old 12-16-2013, 05:40 AM   #1
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12 v vs 6v coach batteries?

My 2001 Monaco came with 4/ 12v batteries for the coach. They are 12v deep cycle batteries. I know that there are usually 4/ 6v golf cart batteries. On my previous coach 2000 Discovery there were 4/ 6's. Question is; will or is this going to be enough? Also does the Inverter/charger charge both the coach and the engine batteries when plugged into 50 amp service?

2001 Monaco Exc

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Old 12-16-2013, 05:49 AM   #2
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Originally Posted by rdstr29 View Post
Also does the Inverter/charger charge both the coach and the engine batteries when plugged into 50 amp service?
2001 Monaco Exc
Our '04 Monaco product didn't. Doubt an '01 does...I say "didn't" because it now has a BIRD installed.

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Old 12-16-2013, 06:36 AM   #3
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My 2001 Diplomat did not when I got it new but I fixed that also. Have not had that unit for several years now but it was a good coach.
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Old 12-16-2013, 09:23 AM   #4
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My rig came with four 8D 12v batteries.

Two were starting batteries and two were storage batteries.

The house batteries provided 440 Amp Hours of storage.

I have converted to 4 six volt Golf Cart batteries to replace the 8D Storage batteries. The four Golf Cart batteries provide about the same 440 Amp Hrs total, but each weighs about half of the 8D twelve volt battery. I like that feature.

So, if your two storage batteries provide about 440 AH then they are as good as the golf cart batteries for current storage.
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Old 12-16-2013, 12:06 PM   #5
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Are you certain that what you have are really deep cycle batteries? There are some 12V batteries that are true deep cycle, but they tend to be very expensive, and not at all common. Most of the 12V marine / deep cycle battery that is commonly available is actually a hybrid, half way between a starting battery and a true deep cycle battery.

You will probably get the most bang for the buck by going with the 6V golf cart batteries. Trojan, US Battery, and Interstate are the common brands.

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Old 12-16-2013, 12:22 PM   #6
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This topic has been beat around a number of times with a variety of opinions.

It comes down to space.

What will fit into the space that you have which offers the largest number of AH's to use?

Be careful on reading the specs of the battery as it is not CCA that you are interested in, it is Ampere Hours of the total battery.

Also remember that you can only use 50% of the total AH's before having to recharge them back to Float SOC.

This document should give you some great information on the type of batteries for your next install. And how to read and understand the differences.

The 12volt Side of Life (Part 1)

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Old 12-16-2013, 03:59 PM   #7
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Dr4Film is correct. It is all about how many amp-hrs you can fit into the space available and at what cost. Typically the best bang for the buck are 6 volt deep cycle wet cell. They do make 12 true deep cycle but are usually much more expensive for the same number of amp-hours.
And to reiterate, most 12 volt batteries labeled "Marine Deep Cycle" are not true deep cycle.
Your inverter/charger does not charge the chassis batteries unless your coach has a BIRD, probably not. You may have a trickle charger that will charge the chassis batteries while on shore power, you'll have check to and see.
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Old 12-16-2013, 05:42 PM   #8
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my rig came with 3 x 8d batteries. i replaced 2 of house batteries with 3 12v trojan J185H-AC and retained the chassis battery as it is still good. the trojan batteries provide 225ah x 3 power, more than enough for my usage.

they lay out like this (sorry for the bad photo quality):

the heart interface inverter charges all chassis and house batteries at the same time. my solar is connected to house batteries only (i did the connections so no doubt about it), somehow the chassis battery is also getting charged. after months of leaving it in the yard, all batteries are still full.

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