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The OP’s scenario is probably one of two reasons that we kept a onboard generator in conjunction with a significant lithium battery pack and solar charging capabilities. We have been in cold weather where we needed to run the furnace at length coupled with limited solar potential due to weather. Our 6500 watt genset quickly recharged our 700AH pack after a couple of days of loads including the furnace. Many people on this forum and other point to the ability to run the AC as a criteria in designing lithium battery capacity. Even if this is your primary focus odds are that you are still limited in runtime. Running the furnace is IMO a more realistic sizing criteria as it’s realistic that you can achieve a capacity to run the furnace for several days when sun challenged.
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