Exactly what needs doing will depend on your current setup beyond just the 516. As mentioned by Roadtripper a few pictures of your setup would help.
To answer Q1, you do need a new mains charger as the 516 is not lithium compatible.
Q2 will depend on what else you need to change, your budget and what you want the kit to do. Victron is an excellent choice.
Q3 is where more info is needed. What other electrical boxes do you have besides the 516? I seem to remember CK use CBE kit and will likely have their other elements too. Is there also a white CBE DS300 with a row of car fuses across the top? And also a white CBE consumer unit for the 240v? If so the 516 power lead connects to the 240v consumer unit via a bespoke connector like one of these:
The output from the 516 goes to the DS300 and connects to the ring terminals (left and centre) in the pic below:
This means straight swap is not that simple as the 240v plug needs changing (or plugging into one of the 3-pin 240v plug sockets). Not difficult at all but not plug and play.
Q4 depends entirely on the rest of the setup. If you have it, the DS300 is not lithium or smart alternator compatible although converters keep fitting it to smart alternator vehicles like the T6 (mine had it!). This means a lithium capable DC-DC charger is also needed to charge the lifepo4 from the engine as described by Roadtripper. This means the DS300 either needs bypassing, modifying or removing depending on the final solution so it doesn’t try to charge the lithium battery. Having said all that, if I remember correctly some CK conversions have a Sergeant DC-DC charger hidden away behind the rear quarter panel with only the CBE kit in view. There was a thread on here a couple of months ago covering that in detail. If that is there, and it has a lithium profile, then that’s one problem solved. The other issue is wiring and fusing, as lifepo4 can take a higher charge amperage you can fit a more powerful charger which may need larger cables and fuses. All depends on what is there and what you fit.
I have just made the switch to lifepo4 (Fogstar Drift 105ah) and had to make numerous changes as I had the CBE kit mentioned above. It took a bit of research but I’m mega happy with the result. 3x the power, 1/3rd the weight, smaller battery, faster charging…. To test it out I’ve had my fridge running since Sunday afternoon and still had 30% charge left this afternoon. At this rate I’ll get nearly a week! Pic of my new setup part way through the install:
Pop some pics up.
