On a 45 foot Sail Boat we have upgraded to 4 x 100Ah Lithium 12v batteries in parallel for House Domestic Services. I have researched your site and feel 2 x Smart IP-22 30A (1output) Chargers are best selection given protected space down below. Space is limited in Battery Locker below Aft Cabin Bunk so the small size of the IP-22 and redundancy of 2 chargers seems a good choice. I already have a Victron 12v 30/30 DC/DC charger installed to charger Batteries from Engine Alternator. How do I connect the 2 x IP-22 in Parallel to each other and to the Single Bank of 4 Lithium Batteries. I am also going to purchase the BMV-712 Monitor and Shunt to monitor Battery condition.