AGM status when gone for long periods

Small system in off grid cabin in Baja Mexico. Two 190 watt panels, thru Xantrex C60 controller to four 12v Deko 105AH AGM batteries. Xantrex 1500 watt modified sinewave inverter/charger to power center. The batteries will be new and a BTS will be used. The cabin is shut down for 4 to 6 months at a time; what would be the best way to leave the system when gone?
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Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter