Engine block heater. But I think the box your talking about is the ATS (tranfer switch) not the inverter. In our electrical cabinet there is also a outlet to plug it into when used.
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2011: 54 days, 2012: 218 days, 2013: 175 days, 2014: 196 days
2015: 188 days, 2016: 72 days, 2017: 185 days: 2018 182 days
2019: 156 days (2009 Berkshire, 390QS, and toad)
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