cdstyle
New Member
The EG4 18K PV has the following spec for PV Input
AC Input Data
MAX. AC INPUT POWER - 12000W
PV INPUT DATA
NUMBER OF MPPTS - 3
INPUTS PER MPPT - 2 (MPPT 1) | 1 (MPPT 2) | 1 (MPPT 3)
MAX. USABLE INPUT CURRENT - 25A (MPPT 1) | 15A (MPPT 2) | 15A (MPPT 3)
MAX. SHORT CIRCUIT INPUT CURRENT - 31A (MPPT 1) | 19A (MPPT 2) | 19A (MPPT 3)
DC INPUT VOLTAGE RANGE - 100-600 VDC
MPPT OPERATING VOLTAGE RANGE - 140-500 VDC
AC GRID OUTPUT DATA
NOMINAL POWER OUTPUT @240v 12000W | @208V 10400W
Question 1.
Do I use the MPPT OPERATING VOLTAGE RANGE or the DC INPUT VOLTAGE RANGE to calculate how many panels I can put in series ?
I assumed I would be using the mppt voltage range of 500 VDC,
but saw this forum post was using DC INPUT VOLTAGE RANGE of 600 VDC to calculate max number of panels in a string, so I wanted to make sure.
I was trying to max out the number of solar panels I can put, with solar panels that has open circuit voltage of 37.07.
If I save 50V to account for voltage spike in low temperature (10% increase in voltage at temperature of 0C/32F), that only leave me with
450/37.07 = 12 panels per string * 4 strings= 48 panels.
Question 2.
It seems like the 18kpv is only able to charge the batteries at a max rate of 12kWh.
Assuming that my pv array is producing 18kW at any given time, and if I am not consuming any power,
can the inverter actually fully utilize the 18kW by saving them to both the battery(if not full, ) and export the rest back to the grid?
Likewise, can the 18kpv export more than 12kW back to the grid?
I know the ac input power of 12kW is per leg, so a 240v breaker can pull 12kW*2 = 24kW,
but don't know if the same thing can be applied when exporting back to grid, which would result in a max export of 24kWh back to the grid.
AC Input Data
MAX. AC INPUT POWER - 12000W
PV INPUT DATA
NUMBER OF MPPTS - 3
INPUTS PER MPPT - 2 (MPPT 1) | 1 (MPPT 2) | 1 (MPPT 3)
MAX. USABLE INPUT CURRENT - 25A (MPPT 1) | 15A (MPPT 2) | 15A (MPPT 3)
MAX. SHORT CIRCUIT INPUT CURRENT - 31A (MPPT 1) | 19A (MPPT 2) | 19A (MPPT 3)
DC INPUT VOLTAGE RANGE - 100-600 VDC
MPPT OPERATING VOLTAGE RANGE - 140-500 VDC
AC GRID OUTPUT DATA
NOMINAL POWER OUTPUT @240v 12000W | @208V 10400W
Question 1.
Do I use the MPPT OPERATING VOLTAGE RANGE or the DC INPUT VOLTAGE RANGE to calculate how many panels I can put in series ?
I assumed I would be using the mppt voltage range of 500 VDC,
but saw this forum post was using DC INPUT VOLTAGE RANGE of 600 VDC to calculate max number of panels in a string, so I wanted to make sure.
I was trying to max out the number of solar panels I can put, with solar panels that has open circuit voltage of 37.07.
If I save 50V to account for voltage spike in low temperature (10% increase in voltage at temperature of 0C/32F), that only leave me with
450/37.07 = 12 panels per string * 4 strings= 48 panels.
Question 2.
It seems like the 18kpv is only able to charge the batteries at a max rate of 12kWh.
Assuming that my pv array is producing 18kW at any given time, and if I am not consuming any power,
can the inverter actually fully utilize the 18kW by saving them to both the battery(if not full, ) and export the rest back to the grid?
Likewise, can the 18kpv export more than 12kW back to the grid?
I know the ac input power of 12kW is per leg, so a 240v breaker can pull 12kW*2 = 24kW,
but don't know if the same thing can be applied when exporting back to grid, which would result in a max export of 24kWh back to the grid.