Hello i purchased an entire setup with Victron Mptt 100/30 and battery charger, however the schematic that i got from the dealer seems over complicated, and it seems that i would have to use twice as much cables from 1 cable from busbar and one from the fuse box to lights.
The two batteries are in parallel , but why have the charger on the busbar and not the - pol on the battery after parallel
You also need a battery protect to stop the AGM from getting too low. You can get away with lithium because the BMS will save it from overdischarge.
You may also want to add a shunt or battery monitor so you can set up a Ve Bluetooth network and communicate the same charge parameters to the solar and AC charger.
I am not sure if the schematic for fuse box connection is correct, my old mptt had 6 connections this victron here only have 4 so i sm not entirely sure if i am right in the fuse box connection.
The fuse box is fine. You will need at least one fuse as close as you can to the battery. If you have a ground fault from the battery to the fuse box, you will get sparks or melt the cable. The Battery protect will also protect from overcurrent, but ATM this entire length of cable is unfused from the source. So if you go through a bulkhead, for example, and it rubs through, you could have a fire.
I like to fuse parallel batteries because there could also be a fault in the connection.
I also just realised I made an error. The battery protect is only one direction. You will need to add it to the loads only. You may need to setup 2 fuse blocks with one for charging and another for discharge.