Bob, you will be fine leaving your batteries connected when on shore power. I think many of us have a wfco 3-stage as supplied by FR.
Below are the three stages for my (55 amp) wfco...
The third stage at 13.2 volts is designed not to boil your batteries dry. Many people leave their trailer plugged in all the time. Periodically checking the water, of course.
Absorption Mode: During this mode, the converter output is in the
13.6 Vdc range. This is the normal operation mode. This mode
provides the 12 Vdc and current required by the 12 Vdc RV appliances,
as well as slow charging the battery.
Bulk Mode: When the converter senses that the RV system voltage is
less than 13.2 Vdc (equivalent to less than 50% of battery charge) the
converter will automatically go into the Bulk mode. In this mode, the
output voltage of the converter will switch to 14.4 Vdc for a maximum
of four hours.
Float Mode: If the RV is not being used for approximately 48 hours,
with a no load condition and the shore power is plugged in, the
converter will automatically go in to the Float mode. In this mode,
the converter is charging the battery with a trickle voltage of 13.2 Vdc.
When the converter senses a demand (by turning on lights), the
converter automatically returns to the Absorption mode 13.6 Vdc.
__________________
Scott
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD
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