I have always unplugged the trailer from the TV because I have always thought that leaving it connected would drain the TV Battery. I guess I don't know for sure if that's true or not, but I've never had a reason to leave it plugged in and figured better safe than sorry.
Also, your converter has a 3 stage battery charger that will output different voltage depending on the charge state of your battery(s). So yes it will charge a discharged battery, that's what it's made to do.
<TABLE border=0 cellSpacing=0 cellPadding=0 width="100%"><T>
<T>
<TR>
<TD vAlign=top width="23%" ="arialblack12bold">Output Ranges</TD>
<TD vAlign=top width="2%" ="arialblack12bold">:</TD>
<TD vAlign=top width="75%" ="paddingbottom">- Nominal (Absorption Mode) 13.6 Vdc (includes charging and load)
- Boost (Bulk Mode) 14.4 Vdc
- Trickle (Float Mode) 13.2 Vdc (after 48 hrs.)</TD></TR></T></T></TABLE>On edit: I am assuming you have a WFCO 9800 series converter like the one in my rig.
If so here is a
link to the spec sheet for it.
Edited by: rock1424