Group 29 VS Group 27
Installed group 29 batteries to replace the original group 27 that came with the RV. Besides the size and capacity is there any problem with going to a higher capacity battery than came originally?
Forum Discussion
Hmmmm ... our Class C has 200 amp hours of coach batteries (two 100AH 12V Group 29 AGM) in it.
On the dash I have a voltmeter and ammeter monitoring these batteries as I travel down the road. With the coach batteries being drawn down to around 12.1 volts after camping and then driving to a new campsite, in about 5 hours the E450's Ford 130 amp alternator will have charged these AGM batteries enough such that the current going into them from the alternator - as indicated by the ammeter's detection shunt I installed in the coach batteries' main negative lead - has declined to show only around 0.1 or 0.2 amps going into the coach batteries
To me, this looks like they have then been fully charged in that time. Perhaps it's because the batteries are AGM that they appear to be charged in 5 hours, or maybe it's the low contact resistance solenoid I installed between the alternator and the coach batteries, or maybe it's the 6 gauge wiring Winnebago installed between the alternator and the coach batteries - but something is causing the batteries to show what they show.
FWIW, these two batteries are 8 years old and I keep them connected to the powered stock 13.8 volt motorhome's converter almost full time (except when the weather is real hot) whenever the RV is in storage at home between trips. The label on the batteries says to float them at 13.5 volts to 13.8 volts.
On the dash I have a voltmeter and ammeter monitoring these batteries as I travel down the road. With the coach batteries being drawn down to around 12.1 volts after camping and then driving to a new campsite, in about 5 hours the E450's Ford 130 amp alternator will have charged these AGM batteries enough such that the current going into them from the alternator - as indicated by the ammeter's detection shunt I installed in the coach batteries' main negative lead - has declined to show only around 0.1 or 0.2 amps going into the coach batteries
To me, this looks like they have then been fully charged in that time. Perhaps it's because the batteries are AGM that they appear to be charged in 5 hours, or maybe it's the low contact resistance solenoid I installed between the alternator and the coach batteries, or maybe it's the 6 gauge wiring Winnebago installed between the alternator and the coach batteries - but something is causing the batteries to show what they show.
FWIW, these two batteries are 8 years old and I keep them connected to the powered stock 13.8 volt motorhome's converter almost full time (except when the weather is real hot) whenever the RV is in storage at home between trips. The label on the batteries says to float them at 13.5 volts to 13.8 volts.
