Our 2021 3121RL has the inverter disconnect switch in the front cargo bay. If that switch is in the "on" position, then, as someone mentioned, there is a switch above the coffee bar that can be used to turn the inverter on/off. We had 2 group 27 lead acid 100AH batteries installed from the dealer and quickly moved to a 200AH lithium battery. We'll be upgrading to 600AH now that we have 500 watts of solar.
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2021 Montana 3121RL
2021 GMC 3500 CC LB SRW 4x4
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