I am busy with a 12 kw 3 phase Sunsynk inverter
Looking at the solar panel calculations, there seems to be a lot of confusion when it comes to the max. amount of panels to be connected to the inverter. Lets start with the inverter specs.
Originally I was going to install JA 545 watt panels, however the roof space is only 14 m x 5 m , which doesn't allow for much wiggle room. So I have decided to go with 460 Watt panels, which will leave me with a little space to walk around, being a 2 story building you want some space to walk.
Spec sheet PV string data
Max. PV input power = 15600watt
15600/460= rounded off to 34 panels, because they are east west facing, we can go over the max power. the inverter will automatically cap the power.
Then we look at the PV input voltage range 550 Vdc ( 160 Vdc - 800 Vdc)
The MPPT input voltage range 200 Vdc - 650 Vdc
People say the VOC is the most important details when designing the solar. So what is the max VOC, can your panel voltage be 800 VDc or 650 Vdc?
I would normally just go with the 550 Vdc, it is in the middle.
The 460 Watt JA panel is 50.01 VOC
So we would be well within the specs if we put 11 or 12 panels per string.
Because the 12 kw inverter can have 2 strings on MPPT 1 and 1 string on MPPT 2, we would need to add up the voltage per panel per string.
MPPT - 12 x 50.1 = 600 Vdc which would still be within spec.
Did you like this article? Share it with your favourite social network.