SunSaver MPPT MODBUSÂ® Specification - Morningstar Corporation

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SunSaver MPPT MODBUS Specificationv05EEPROM ValuesEEPROM values that require updating are done so once every 24 hours.Charging Settings (bank 1 & bank 2)Diagram A Charging stages and defining variables.EV_reg [57345][0xE000](V). Regulation voltage (absorption), bank 1 @ 25ºC.EV_reg2 [57558][0xE00D](V). Regulation voltage (absorption), bank 2 @ 25ºC.The battery will charge at 100% charge current until battery voltage reaches this setpoint. The controllerwill begin to taper input current so that this setpoint is maintained, but not exceeded. See diagram A.http://www.morningstarcorp.com 16/26 23 April 2008
SunSaver MPPT MODBUS Specificationv05EV_float [57346][0xE001](V). Float voltage, bank 1 @ 25ºCEV_float2 [57359][0xE00E](V). Float voltage, bank 2 @ 25ºCAfter Et_float seconds in absorption, when the battery is fully charged, the battery will transition to thislower voltage charge setting to reduce gassing. See diagram A.Set to zero to disable float stageEt_float [57347][0xE002](seconds) time before entering float, bank 1Et_float2 [57360][0xE00F](seconds) time before entering float, bank 2Defines the length of time in absorption before transitioning to the float stage. See diagram A.Et_floatlb [57348][0xE003](seconds) time before entering float due to low battery, bank 1Et_floatlb2 [57361][0xE010](seconds) time before entering float due to low battery, bank 2If the battery voltage drops too low during the previous night, this value allows the user to specify alonger period of time before entering float stage.EV_floatlb_trip [57349][0xE004](V). Voltage that triggers low battery float time, bank 1EV_floatlb_trip2 [57362][0xE011](V). Voltage that triggers low battery float time, bank 2Battery voltage that will trigger a longer period of time before entering float. - See Et_floatlb -EV_float_cancel [57350][0xE005](V). Voltage that cancels float, bank 1EV_float_cancel2 [57363][0xE012](V). Voltage that cancels float, bank 2Specify the battery voltage that will cancel float for the next charge cycle. If the battery discharged toolow the previous night, the user may want to cancel float for the next day.Et_float_exit_cum [57351][0xE006](V). Exit float timer, bank 1Et_float_exit_cum2 [57364][0xE013](V). Exit float timer, bank 2Specify (cumulative) amount of time below float voltage before exiting the float stage. Battery voltagemay drop below the target float voltage due to insufficient charge current or a system load draws morecurrent from the battery than the array can provide.http://www.morningstarcorp.com 17/26 23 April 2008
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SunSaver MPPT MODBUSÂ® Specification - Morningstar Corporation

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