Xantrex/magnum inverter

we did works great.

No complaints on my Magnum. Well, maybe one. They came out with the "hybrid" model about a year after I bought my unit.

#1 tip is going with a higher voltage. 8 batteries sounds like a good candidate for a 48 volt system (8x 6v GC2-AGM).

#2 If 48v isn't an option, make sure your cabling meets the specs in the installation guide.

Is this for an inverter/ charger or just for an inverter? Either way do you need a remote display/controller for it or just use the onboard buttons? What other battery monitoring do you have--Trimetric or whatever?

Lots of choices for whatever you need/want. PSW inverters are way down in price nowadays. One example:

https://powermaxconverters.com/product-category/inverters-dc-ac/

Inverter charger. I have 8
6 volt batteries AGM’’s

I

what is the proper gauge wire to size an material to buy. I have access to
a shop to crimp and insulate the cable s

If I go back with 8- 6 volt AGM’s
With a 2500 inverter/charger

What size batt would you recommend

Excuse the grammar. Using a friends iphone

You would need a huge charger in amps size to do those 8- 6v batts at 20% rate if you got down to where you needed a Bulk stage in your recharge.

With AGMs it is vital that you have a charger that can hold 14.x volts steady in the Absorption stage while amps taper to 0.5a /100AH of bank. And you need an ammeter or monitor that can show when you get to those amps and know your batts are truly full.

You will need to be on shore power to do that. If you have shore power, you don't need all that. If off-grid , you can't ever get them properly full, so they will die an early death.

Something is not logical here. What is the actual scenario?

Once we know that, then we can give you some useful advice. (For free! :) )

Instead of Magnum, I'd look carefully at Victron and/or Outback.

Do get a hybrid type.

I think you have answered my issue. That explains why my batts only have lasted 4 years.
We use the batt bank to run frig house lights fans I monitor the remote. When I see my storage power drop to about 50% I will normally run the little red Honda gen. Which handles our needs
easily. BUT. Is only putting 5 Amps of charge back into the bank of 8 agm’s
Then once back to the dock shore power is used to slowly at 5 amp rate recharge the bank till the next weekend.

I have noticed these batts have begun to swell
So between killing my bank, the inverter 2000 is getting beat up too