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There are two ways you can set your GridSupp Volts for selling if using an XW inverter charger and an XW MPPT controller.To trigger grid-support and sell, the XW inverter will use the LOWER of the following two voltage settings:
If you want to sell only the energy that the batteries no longer accept, while maintaining a fully charged battery, and assuming you have recent firmware in your Inverter/Charger (later than September 2008), you need to set GridSuppVolts >1V higher than the Charge Controller Bulk voltage. See attached waveforms.A high value for grid support volts will ensure the inverter always uses charge controller voltage for bulk/abs/float as "grid support volts", allowing the grid support volts to track the voltage profile for a complete battery charge cycle. In doing so, the XW inverter only uses what is not accepted by the battery to sell to local loads and the grid thereby maximizing use of the array.
The batteries will still be charged to the charge controller Bulk/Abs/Flt, not to the GridSuppVolts. If you have a dated firmware revision, this function will not be available. You will need to perform a firmware upgrade. Contact Technical Support for details.
Some people/applications might simply want to sell all they have harvested. In that case, set the GridSuppVolt lower than the Charge controller Bulk/Abs/Flt value. In that case the inverter will regulate the battery voltage to that level.