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Old 10-31-2013, 12:25 AM   #15
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Originally Posted by wa8yxm View Post
IS the RV occupied while the batteries are dropping 30% overnight.. normal if you are running the furnace.
No, it is simply parked next to our home. I am not trusting the percent-of-charge read out
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Old 10-31-2013, 12:32 AM   #16
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Wow...you got an awful lot of very bad info from the Xantrex guy since putting a voltmeter on an Agm tells you NOTHING unless the battery has been physically disconnected and idle for about a DAY. If it is fully charged before you do this the voltmeter should read 12.6...NOT less or it is showing signs of age. Anything less than a 12.3 reading a day after a full charge and you should be considering replacement or should have a reliable backup.
Finally if you have 15 amps going in on so called "float" you are either NOT in float or you are going to murder your batteries. My assumption is that you have 4 six volt AGMs with a combined capacity of about 400 amp hours at 12 Volts. If so....the MAXIMUM current you should be floating at is 8 amps (2%) and half that is preferable. AGM's should float at around 13.4V and LESS than 2% of battery amp hours in amps.
If you are seeing anything above 13.8 and 8amps...you need to adjust your float parameters or find a charger that does the job correctly.

AGM's are EXTREMELY sensitive to getting a Full 100% charge as soon as possible after discharge. Don't let your batteries sit at less than 100% for more than a few of days. ALWAYS charge to 100% no matter how long it takes. Getting the last 20% of charge in takes as long as getting the other 80% but don't shortcut it!

Good luck!
Thanks so much for taking the time to respond. I think that this is what the xantex tech meant - a static voltage reading after the battery has been fully charged and idle. Also, to clarify, the 15 amp VAC is house voltage applied to the coach via the 50amp/30 amp/110VAC adapter allowing the inverter to apply the correct float charge.
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Old 10-31-2013, 07:47 PM   #17
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Thanks so much for taking the time to respond. I think that this is what the xantex tech meant - a static voltage reading after the battery has been fully charged and idle. Also, to clarify, the 15 amp VAC is house voltage applied to the coach via the 50amp/30 amp/110VAC adapter allowing the inverter to apply the correct float charge.
Whew!
Just know that 12.2/12.3/12.4 after fully charging and idle for a day means the battery is seriously worn and nearing the end of its' life...particularly if it is holding only 50% charge like it is at 12.2!
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Old 11-01-2013, 11:08 PM   #18
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Whew!
Just know that 12.2/12.3/12.4 after fully charging and idle for a day means the battery is seriously worn and nearing the end of its' life...particularly if it is holding only 50% charge like it is at 12.2!
agreed. my fully charged house battery while float charger was still on i got 13.4. sitting for 3 hours then tested, it's stabilized at 13.2v
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Old 11-02-2013, 09:57 PM   #19
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Float charge should be LESS that 0.1% of labed capacity.

So a 100 AH baytery should float at less than 100 ma after fully charged.

If it is charging at 8 amps and the voltage is low, battery may be bad, if 8 amps and voltage above 13.5 the battery will be toast.

Search the forum for battery charging and you will have a lot of information.

For specific batteries check the data sheets for correct information
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Old 11-06-2013, 10:05 PM   #20
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Whew!
Just know that 12.2/12.3/12.4 after fully charging and idle for a day means the battery is seriously worn and nearing the end of its' life...particularly if it is holding only 50% charge like it is at 12.2!
Okay Camaraderie - so, after fully charged, I unplug and let the batteries sit idle for 24 hours. The chassis batteries read 13.8. One of the large AGM reads 12.8 and the other 12.2. Comments?
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Old 11-07-2013, 01:01 PM   #21
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Okay Camaraderie - so, after fully charged, I unplug and let the batteries sit idle for 24 hours. The chassis batteries read 13.8. One of the large AGM reads 12.8 and the other 12.2. Comments?
The battery reading 12.2 is 50% discharged. If there has been no load on it to discharge it more than the other battery reading 12.8, it is shot IMO.
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Old 11-10-2013, 06:54 AM   #22
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Sounds like you have 2 8D lifeline batteries? You can run an equalize charge (if they are lifelines), do not try this if you have another brand. Your zantrex must be set on "FLOODED" In the type of batteries ln order to equalize., this process may bring the low battery back. If you do decide to replace, you should replace both batteries. Lifeline batteries are good, you could call them for some advice. Good luck
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