Hi folks,
I'm putting together a solar system as a new learner - and wanted to check out if I'm understanding everything correctly. Any help or pointers to more reading would be appreciated.
Here's what I'm looking at:
Panels: 365 watt (40.8 Voc, 11.33 Isc)
Inverter: MPP LV6548 (2 PV inputs, Max PV input 4000W (per side), 250V (max))
Battery: EG4 LifePO4 48V / 100 AH X 4 (parallel) = 48V / 400 AH of battery
In Austin Texas
PV Array Size/layout: p2S5 for each side.
To make sure the PV Array is the proper size for the invertor:
1 array(side) voltage == 204 V (40.8Voc *5 panels) <- this is < than 250V max for invertor
1 array(side) watts == Q1) I wasn't sure how to calculate, is it a or b?:
A) 365 watts * 10 (wattage of panels * number of panels) = 3650 Watts (which is < than 4000W per side)
B) 204 total volts * (2 strings * 11.33 Isc) = 204 V * (22.6 amps) = 4622 Watts (which is > than 4000W per side) - in this case I can only do P2S4
Q2) should I be using any values from PVWatts in the above?
Q3) any safety factors to add in? (I was confused around what the invetor can handle as UL listed vs. what to take off the top for cold weather )
PV Array -> Battery Size Check (1 PV array(side) only)
PV Battery Charging Amps (assuming P2S5 and 3650 Watts from above): 3650 PV Watts / 48V = 76.04 Charging Amps
Adding in energy loss = 76.04 Amps * (1 - 20% loss) * 95% LifeP0 efficiency = 76.04 Amps * (.8) * .95 = 57.70 Charging Amps
Battery Charging (1 PV array(side) only) = 400 AH * (1 /95% efficiency) / 57.70 Charging Amps = 7.29 hours to charge batter bank (given 2 sides would be half that and < than ~5 hours of sunlight per day).
Q4) any huge math/assumption problems?
Q5) any equipment tweaks you would do? (growwatt, etc..)
Q6) any other guidance/thoughts?
thank you so much,
Aron.
I'm putting together a solar system as a new learner - and wanted to check out if I'm understanding everything correctly. Any help or pointers to more reading would be appreciated.
Here's what I'm looking at:
Panels: 365 watt (40.8 Voc, 11.33 Isc)
Inverter: MPP LV6548 (2 PV inputs, Max PV input 4000W (per side), 250V (max))
Battery: EG4 LifePO4 48V / 100 AH X 4 (parallel) = 48V / 400 AH of battery
In Austin Texas
PV Array Size/layout: p2S5 for each side.
To make sure the PV Array is the proper size for the invertor:
1 array(side) voltage == 204 V (40.8Voc *5 panels) <- this is < than 250V max for invertor
1 array(side) watts == Q1) I wasn't sure how to calculate, is it a or b?:
A) 365 watts * 10 (wattage of panels * number of panels) = 3650 Watts (which is < than 4000W per side)
B) 204 total volts * (2 strings * 11.33 Isc) = 204 V * (22.6 amps) = 4622 Watts (which is > than 4000W per side) - in this case I can only do P2S4
Q2) should I be using any values from PVWatts in the above?
Q3) any safety factors to add in? (I was confused around what the invetor can handle as UL listed vs. what to take off the top for cold weather )
PV Array -> Battery Size Check (1 PV array(side) only)
PV Battery Charging Amps (assuming P2S5 and 3650 Watts from above): 3650 PV Watts / 48V = 76.04 Charging Amps
Adding in energy loss = 76.04 Amps * (1 - 20% loss) * 95% LifeP0 efficiency = 76.04 Amps * (.8) * .95 = 57.70 Charging Amps
Battery Charging (1 PV array(side) only) = 400 AH * (1 /95% efficiency) / 57.70 Charging Amps = 7.29 hours to charge batter bank (given 2 sides would be half that and < than ~5 hours of sunlight per day).
Q4) any huge math/assumption problems?
Q5) any equipment tweaks you would do? (growwatt, etc..)
Q6) any other guidance/thoughts?
thank you so much,
Aron.