I have a similar model, not the Jayco version. I swapped out a 100Ah AGM for 200Ah of lithium. You need to read your manual, mine has four Dip switches on the main unit;

DS1 & 2 are for BAT capacity, mine was DS1 = ON, DS 2 = OFF for 100Ah. I changed them to DS1 = OFF, DS2 = OFF which is the setting for 200Ah.

DS3 & 4 are for BAT chemistry, was DS3 = OFF, DS4 = OFF for AGM. I changed them to DS3 = ON, DS4 = OFF which is the setting for LFP.

The manual is not an easy read for a novice, I have a mech/elec design background and I had to read it thru several times. Better done at the van so you can absorb each section at the device.

There is a Facebook Projecta Group, worth joining if you need more help and it is monitored by Conrad, whom I believe works for Projecta.

:)