The wiring from the inverter to the battery should be direct, fused and as short as possible. You should use #6 or #4 wire depending on the length of the run. Remember that for every 1A at 120VAC you use, you will be using 10A at 12VDC. Depending on your CPAP, you may need additional battery capacity to cover multiple days. Although you may not need the heavier gauge wire now, it will be there when tempted to use more of your 2000W.
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2015 Freedom Express 248RBS
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