What you might do is locate the DC cabling coming from your WF8955 converter/charger where it connects to the battery terminal. Pull that back to pass thru storage area or where you want to install the PD9200 or PD4600 series converter/charger.
These PD converters have DUAL CONNECTOR slots for both POS and NEG battery cables. You can see the DUAL CONNECTORs in this photo.
You can connect the WF8955 #8 size battery cables to one side of the dual connector and the new 4AWG cables from the other side of the DUAL CONNECTOR to go to the battery terminals. Be sure to observe the POS and NEG terminals on the PD unit.
This will allow to provide BATTERY to the 12VDC Power Distribution panel in the WF8900 series unit as well as allowing your PD converter/charger to charge your batteries.
You can power up either unit by just flipping the 120VAC Circuit breaker for the one you want to be ON.
Your WF8955 unit can be a back-up for you now and the new PD9200 series converter can be your primary unit...
This is simple diagram of how my two converter/chargers are wired for my battery bank.
Food for thought...
Roy Ken
