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Old 02-07-2022, 01:54 PM   #1
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Voltage readings on the firefly

What's normal when parked on shore power.
The house reads 12.5 to 13.3 and the chassis is usually 12.5 to 12.9.
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Old 02-08-2022, 12:48 AM   #2
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What's normal when parked on shore power.
The house reads 12.5 to 13.3 and the chassis is usually 12.5 to 12.9.
Pretty much normal ranges, when plugged in your converter/charger will switch between storage, normal and boost modes depending on the battery state of charge. Storage mode is the most common when plugged in and runs at the 13.3 volt charge rate and 12.5 is around 80% for AGMs. The chassis batteries are also kept charged by the converter/charger and switches between the house and chassis batteries so that’s why you are seeing the small ups and downs.
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Old 02-08-2022, 08:49 AM   #3
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charging specs

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What's normal when parked on shore power.
The house reads 12.5 to 13.3 and the chassis is usually 12.5 to 12.9.
Seems normal to me, my rig is out back in a garage i check mine about once a week
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Old 02-08-2022, 10:28 AM   #4
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Thanks for the info. I didn't know the charger was that intelligent. Maybe that's why I here something click like a solenoid? IT happens like every 4 minutes or so. Can't seem to find out where it's coming from.lol
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Old 02-08-2022, 11:01 AM   #5
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Thanks for the info. I didn't know the charger was that intelligent. Maybe that's why I here something click like a solenoid? IT happens like every 4 minutes or so. Can't seem to find out where it's coming from.lol

That is probably the BIM switching between the house and coach batteries charging them. The newer BIMs re pretty loud.
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