Hi guys. New to the forum, but have been watching Will's videos for some time now.
I ordered an EcoFlow Delta Pro on the Kickstarter campaign and am trying to figure out the solar panel setup to keep the Delta Pro charged.
Here's some info:
Location: I live in Southern California where summers can reach over 115F. The coldest it gets is around mid-30s in the middle of the night, but typically over 50F by the time sun comes up.
Delta Pro PV Input Specs:
- Max Voltage = 150V
- Max Current = 12A
- Max Power = 1200W
Considering the Delta Pro's input current limit, the PV setup is limited to a single string. I'd like to reach the 1200W input limit if possible. I'm aware of the recommendation to account for PV Voc at colder temps, which is why I need some help.
Ideally, 3x 400W panels would provide the perfect 1200W of solar to the Delta Pro. However, the Voc of virtually all 400W+ panels is right around 50V at STC, so 3x panels would be right at the Delta Pro input voltage limit. Adding in some voltage rise due to lower temps would bring input voltage over the Delta Pro limit (by about 15-20V).
Going down to 350W-ish panels would bring Voc well within the Delta Pro limit, but I'd be lower than the 1200W that I'd really like to hit.
However, considering STC is measured with an ambient temp of near 0C and for the most part, the temperature in my area is typically above 50F by the time the sun comes out and any light would hit the panels, it would seem the NOCT numbers is more appropriate to use. The NOCT Voc of most 400W panels is 47V, which with some colder temp rise, should fall right in to the Delta Pro's input limit.
Browsing the site, I see folks only using the STC values. If I do, then I'd either exceed the Delta Pro's limits or have less solar power than I'd like. However, using NOCT values aligns almost perfectly with the Delta Pro's limits.
So should I use STC or NOCT values for my setup design?
Thanks for the help!
I ordered an EcoFlow Delta Pro on the Kickstarter campaign and am trying to figure out the solar panel setup to keep the Delta Pro charged.
Here's some info:
Location: I live in Southern California where summers can reach over 115F. The coldest it gets is around mid-30s in the middle of the night, but typically over 50F by the time sun comes up.
Delta Pro PV Input Specs:
- Max Voltage = 150V
- Max Current = 12A
- Max Power = 1200W
Considering the Delta Pro's input current limit, the PV setup is limited to a single string. I'd like to reach the 1200W input limit if possible. I'm aware of the recommendation to account for PV Voc at colder temps, which is why I need some help.
Ideally, 3x 400W panels would provide the perfect 1200W of solar to the Delta Pro. However, the Voc of virtually all 400W+ panels is right around 50V at STC, so 3x panels would be right at the Delta Pro input voltage limit. Adding in some voltage rise due to lower temps would bring input voltage over the Delta Pro limit (by about 15-20V).
Going down to 350W-ish panels would bring Voc well within the Delta Pro limit, but I'd be lower than the 1200W that I'd really like to hit.
However, considering STC is measured with an ambient temp of near 0C and for the most part, the temperature in my area is typically above 50F by the time the sun comes out and any light would hit the panels, it would seem the NOCT numbers is more appropriate to use. The NOCT Voc of most 400W panels is 47V, which with some colder temp rise, should fall right in to the Delta Pro's input limit.
Browsing the site, I see folks only using the STC values. If I do, then I'd either exceed the Delta Pro's limits or have less solar power than I'd like. However, using NOCT values aligns almost perfectly with the Delta Pro's limits.
So should I use STC or NOCT values for my setup design?
Thanks for the help!