Reminder that two batts will not last as long between recharges as four so one is not as good as the other for that.
The point here is just the AGM's ability to stay above the inverter's 11v alarm for those AH before getting down to 50%.
Another way to look at it is with 200AH of Wets you have 100AH but the inverter will alarm on high draws once down to 75% SOC, so that gives you 50AH of window, while the 200AH of AGM lets you use all 100AH of window for occasional high amp draws. You still have 50AH left of Wets between 75-50% SOC but can only use that for lower amp draws.
You need four Wets to do that, but now you also have a 200AH window for occasional high draw use instead of 100AH with the two AGMs
So if you are going to carry four batts anyway, might as well save money and use Wets, unless you need to keep the batts inside. The AGM advantage is where you only have room for two batts.
