A week or so each time maybe three times yearly won't damage a good quality AGM. But where this fails is the batteries *must* thereupon be recharged at a steady 14.0 volts for 24 hours, then reverted to a temperature compensated float voltage.
Where is the origin of the Renology battery? What is their provenance? I do not not trust any made in China AGM that does not have hundreds of verified satisfied customers behind it. Under ratio AGM A/H to charger size systems can exist if the user is willing to have "rest and recuperation days" where total recharging is allowed. A Harbor Freight 2-cycle generator coupled to a 29 amp MEGAWATT power supply can work miracles for remote safe camping with AGM.