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Old 09-17-2014, 12:30 AM   #1
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Inverter not charging coach batteries

Our O2 HR Neptune DP has a Freedom Combi 1500W inverter/charger. I m hooked up to 30A shore power. Today I noticed that the battery low light on the main panel was lit. There are 3 lights. Low(red) Medium (yellow) and Full (green). I checked the voltage, and it was down to 11.8V

(The chassis batteries are right up at 12.45V every time I check. Once I noticed them down a bit, like 12.3, but later that day they were back up to 12.4V)

I pushed the CHARGE button and it charged the batteries back up.

My question is why is it not keeping the batteries charged to at least 12 volts. There is nothing 12V running, except for the power needed for the 12V electrical control panel.

We don't use the inverter hardly at all. I m considering switching it out for a good converter with 4 charge levels. They are about $250.

All three Interstate batteries are just a few weeks old.

Maybe I'm not setting up something on the control panel correctly?

Any thoughts would be appreciated.
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Old 09-17-2014, 09:36 AM   #2
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If I understand you right.....when you push a "charge" button, your house batteries charge completely. 14.4 volts all the way to the battery then eventually taper to 13.4 volts to the battery? If that's what's happening I would suspect the charger. I only say this because this should all be happening automatically. If you can make this happen then the cabling to and from the charger would be good.
If you're not sure that the voltages all the way to the battery are good than I would double check the connections and maybe even a fuse.
Is the inverter/charger the only battery charger you have on board? (Solar, original converter, etc)
When you say 3 new batteries are you including one for the starting battery and two for the house batteries? Are the two house batteries true deep cycle?
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Old 09-17-2014, 10:02 AM   #3
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Yes, the inverter is the only charger. The three new Interstate batteries are for the coach. I have two other batteries for the chassis. There are 5 batteries total.

The batteries are most likely not true deep cycle, unfortunately.
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Old 09-17-2014, 10:07 AM   #4
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Curious--the three house bats are 12v wired in parallel? Trying to remember how my old Combi 2000 worked....Newer xantrex products have a "hot charge" option that initiates a charge cycle everytime shore power or genset are applied--think its the default/factory set but you have the option of turning it off on the xantrex 2000..... Assume your inverter was working/charging normally before but not now [post bat swap out] for some reason???
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Old 09-17-2014, 11:41 AM   #5
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Quote:
Originally Posted by draboo View Post

(The chassis batteries are right up at 12.45V every time I check. Once I noticed them down a bit, like 12.3, but later that day they were back up to 12.4V)

I pushed the CHARGE button and it charged the batteries back up.

My question is why is it not keeping the batteries charged to at least 12 volts. There is nothing 12V running, except for the power needed for the 12V electrical control panel.
12.0 volts is commonly viewed as half way discharged!

Fully charged Chassis batteries should be about 12.6 dcv. While charging is occurring you should see @ 13.5 dcv.

Do your chassis batteries get charged from shore power when going from 12.3 to 12.4? Not all motorhome starting batteries are charged by shore power.


The charge button must control charging to the House battery?

How long were the house batteries charged? At 11.8v status I would guess they needed at least 4 hours to be fully charged by shore power.

And, as previously asked, did you see a 14.4 volts reading at the house battery terminals during the initial phase of charging?
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Old 09-18-2014, 01:54 PM   #6
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Well Draboo,
This is one of the "pitfalls" of having a component that has or does, two functions. Meaning, it "inverts" for giving you 110VAC when you need it, and, it also charges the house batteries. And, many of them have multistage charging too. But, as has been suggested, get a volt-ohm meter and, double check, right at the house battery terminals, to see just what exactly is getting to them in voltage.

If you see the same numbers as you see inside the coach, and, of course you're plugged into shore power when all these tests are being done, then a couple of things might have happened. One, there may be a fuse someplace in charging system or, two, the "charger" side of that Inverter/charger has gone south permanently. I, and several others have had that happen.

If it did, if it did, you've got two choices. One, sh..can the whole thing and go buy another unit. Or two, find out if someone works on that model and can do a thorough testing and evaluation to see what's actually wrong and, give you a repair cost.

I had our Dimensions 2000 Inerter/charger go bad after we owned the coach for right at 3 years and, found a great replacement for it on Craigslist. I got a MSW Magnatek 2012, only six months old for $650.00
Hope this helps some.
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Old 09-18-2014, 02:07 PM   #7
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A couple of things puzzle me.

If there is a button to push that initiates a charging cycle then is there a setting that lets you turn off automatic charging? If that has gotten turned off that could be your problem. Time to look for the manual on line?

If you do not use the inverter much does that mean you turn it off?
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