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Inverter should remain on all the times even if on shore power. Inverter has a built in transfer switch that will pass shore power to the inverted outlets. If shore power is lost, the inverter will start inverting 12 volt battery power to 120 volt ac. If you turn off the inverter you will lose power to the inverted outlets.
As far as the E1 code, you're batteries are low. Make sure both disconnects are on!
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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