Batteries and 12 volt system

Battery types are often confusing, and mis-interpreted. An AGM is a Lead Acid battery, a gel is a lead acid battery. I think you are confusing 'flooded' with 'AGM', yes?

AGM are very good deep cycle batteries, much better than flooded batteries. They need a specific cycle regime though, the charger needs to be compatible with an AGM (or gel). Most smart chargers these days do the job nicely although I have no comment on the sinergex, never used one.

With the price of batteries having gone thru the roof and the $ going down the question u pose is a hard one ,, me I,d be asking for a full price breakdown on the variables , how much $ difference for EACH of the proposed upgrades ,not just a total combined , depending on brand a 100amp hr AGM will vary by mega $ alone ,,, The projecta charger will charge an AGM but obviously not as quick as the Sinergex ,, the inverta is a question of price and quality and not of capacity ... My Fullriver AGMs are now all 6yrs old and still as good as the day they were bought , allways charged from vehicle altenator /solar and or c/tec charger.

How many batteries are in this price and what brand?