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Short answer

Not in the same simple parallel house bank. AGM and lithium batteries want different charge profiles, discharge differently, and confuse monitoring when tied together directly. If both chemistries stay in the rig, keep them separated by purpose and charging equipment.

Short answer

Yes, sometimes. A properly sized solar, lithium battery, inverter, and soft-start setup can run an RV air conditioner for limited periods, but most rigs should plan around short bursts or shoulder-season support rather than all-day summer cooling.

Short answer

For many remote workers, the first honest answer is usually around 200Ah to 300Ah of lithium for calmer everyday use, but the real number depends on whether the workday includes Starlink, multiple monitors, cloudy-weather reserve, and how quickly the rig can recharge the bank afterward.