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What does "reverse sell" mean on the status page of an XW+ inverter/charger?

Issue:XW+ shows "reverse sell"

Answer: ReverseSellBatt comes up normally when the XW+ has a grid-tied PV inverter connected to the load side in an 'offgrid' ac coupled configuration. When the PV power is greater than load power, the PV power goes through the XW+ in 'reverse' to charge the battery. Once the battery is full, the inverter status changes to AC coupled or Invert.

NOTE:If you don't have an AC coupled system then this can be coming from voltage imbalance on the XWs, or somehow some reactive power is coming from the coolers compressor and backfeeding the XW+
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