Use of a low amperage charger intrinsically protects against high voltage latching leading to high amperage. A Battery Minder rather than a high amperage potential inverter would be a example.
You folks are not familiar with AGM Batteries. The RECOMBINANT valves return 100% of gas to liquid even at 145°F. It takes 17 to 18 volts potential to gas gelled electrolyte enough to activate a relief valve. Thermal runaway only occurs with abusively high amperage. Thus the reason for my recommendation of an Intrinsictly protective low amperage maintenance device. Make it idiot proof.
Solar panels can be shaded to limit ultimate maximum current to 5 amperes current for long term storage.
100 CCs of space can allow an oxygen hydrogen stoichometeric the explosive force of a 12 gauge shotgun shell.