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Old 01-12-2019, 02:46 PM   #1
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battery voltage 2019 I5 30fw with residential refer

Hi again,
I've added 2 group 31 Crown group 31 AGM batteries to the two the came with it.
I've also added a solar panel so that I've got 300 watts total.
We were plugged into 50 amp outlet for 8 nights. A few minutes after disconnecting from shore power, 12.6 volts were showing on the Magnum readout. We drove 130 miles under sunny skies yesterday immediately after disconnecting and when we stopped, it still showed 12.6 volts. After dry camping last night, the readout showed 12.2. After electric brewing of 4 cups of coffee readout was 12.1 to 11.9.
Any ideas as to what voltage I should be expecting under the above scenario?
Thanks in advance

PS: it is now 11:49 and solar has increased readout to 12.3
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Old 01-12-2019, 02:50 PM   #2
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What voltage do you show when hooked to shore power? Are all your batteries same brand and size?
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Old 01-12-2019, 02:56 PM   #3
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I can't recall the readout when plugged in, but it shows floating.
I think the original batteries were group 27 or 29 and the two added were 31. I've been told by experts that the batteries are reservoirs so that in this application they don't have to match.
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Old 01-12-2019, 03:09 PM   #4
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i added the 2 additional batteries within a couple of months of the mh being new.
I agree with your comments regarding matching batteries for starting batteries but have been told that the same doesn't apply to storage batteries?
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Old 01-12-2019, 03:26 PM   #5
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it looks like you are doing just fine

when you are plugged into shore power(120v to your charger), you should be seeing in the range of 13+..14volts while charging is happening, or float, or absorb

when you are under solar charger, after unplugging from shore power(120v), or your generator, you are only going to see the 'current' Volts of the batteries, NOT the Charging volts at 120v input, since your Solar is not a high enough amperage to give you anything other than a 'trickle' charge. 12.6 is a great number, basically 'FULL', or close to it.
If you are at 11.9 to 12.0 after all of your usage, as you state, you are doing just great.
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Old 01-12-2019, 03:36 PM   #6
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also, if your Magnum Inverter/Charger has a remote readout panel, make sure the setting for Battery Type is set to your battery bank's type, AGM, which has it's own set of charging time and variables as compared to the typical FLA flooded acid batteries, which come with most motorhomes.
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Old 01-13-2019, 09:31 AM   #7
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If you want to get detailed in your battery analysis I'd recommend a battery monitor. It measures the actual amps going in/out of the battery bank and thus can give you true state of charge. Voltage is a decent indicator but can also be affected by several other factors.

https://www.victronenergy.com/upload...-series-EN.pdf
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Old 01-13-2019, 09:50 AM   #8
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Quote:
Originally Posted by FOURWHL View Post
If you want to get detailed in your battery analysis I'd recommend a battery monitor. It measures the actual amps going in/out of the battery bank and thus can give you true state of charge. Voltage is a decent indicator but can also be affected by several other factors.

https://www.victronenergy.com/upload...-series-EN.pdf
I am installing one this week and will have some pics of the install and a review from our trip next week.
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Old 01-13-2019, 11:06 AM   #9
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thanks, everyone for your responses.
However, I forgot one fact, that I ran the generator for one hour both nights. Last night I turned it off at 8:00 it showed 12.7 volts. this morning at 7:30 it's at 12.1 which I think is too low to perk coffee or run the microwave, and camp rules state to not run the generator before 10. Am I expecting too much from 4 batteries with the res refer, or do I have a problem?
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Old 01-13-2019, 11:11 AM   #10
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nope, it sounds like you are doing just fine - perk your coffee!

remember, too, that those with only one or two House batteries, will see these 'number' drop so much faster - but since you have FOUR, you are going to have higher numbers for much longer time periods, so seeing a 12.1 is not any problem - you could fall all the way to 11.5 before I would 'worry', though starting your generator at about 11.9 would be a good idea, but 11.5 is not a deal breaker for the 'every now and then' scenario when you are in a campground that limits generator usage times. Go with it!
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