If your converter is the WFCO 8735P (or ends in 35), the 30 amp fuse is appropriate. Your converter can output 35 amps DC (the fan will be pretty loud if actually putting out that much), so 30 amps to the battery would be correct.
If you have a 25 amp converter (last 2 of the model # end in 25), a 25 amp fuse would be appropriate. Some of the earlier pop-ups (not sure about A-frames) had 20 or 25 amp converters instead of the now pretty-standard WFCO 8735P converter.
If plugged in, everything DC should work except for battery charging, being powered by the converter instead of the battery. If not plugged in, nothing DC will work (includes thermostat, CoolCat (because of thermostat DC relay), propane/CO detector, stereo, water heater, as well as lights and water pump) if the battery fuse is blown.
Fred W
2019 Flagstaff T21TBHW A-frame
2008 Hyundai Entourage minivan
camping Colorado and adjacent states one weekend at a time
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