Barbar0ssa
New Member
- Joined
- Mar 3, 2021
- Messages
- 80
This will be my build thread for my off-grid 48v system on my garage roof for backup and charging my electric car.
My roof area is about 25'x 25' which should fit 8 72-cell panels nicely. I planned the racking with Unirac Ubuilder.
I purchased my 3kw all-in-one (xindun LSM-30248) before I had planned on charging the electric car so I only have 120v. If I want to charge quickly, I may need to add a 240V inverter in the future.
I have 20 x 271 CATL cells (16 for this project an 4 for a smaller 12v setup) coming next Wednesday!
Right now I am trying to choose the best panels for my setup and that seems to come down to bi-facial vs mono-facial. I will be roof mounting so there will be much less reflection from the surface but I have heard that bi-facial are more efficient on cloudy days and my area has far far too many cloudy days so I am leaning that way right now.
With my current space, amperage, and voltage constraints, it looks like I will be designing 4 parallel strings of 2 panels.
The two front-runners at the moment are:
LONGi Solar LR4-72HPH-445M- These are called bi-facial but say that they have a white backsheet and mono-perc? They would be $0.59/w delivered and this company has all of the racking I need so it would be very convenient order.
Solorever 440w - made in the US, $0.53/w delivered. Signature Solar doesn't have the racking I need so I would likely have higher overall costs if I buy here.
I am definitely open to suggestions if there are better options out there.
My roof area is about 25'x 25' which should fit 8 72-cell panels nicely. I planned the racking with Unirac Ubuilder.
I purchased my 3kw all-in-one (xindun LSM-30248) before I had planned on charging the electric car so I only have 120v. If I want to charge quickly, I may need to add a 240V inverter in the future.
I have 20 x 271 CATL cells (16 for this project an 4 for a smaller 12v setup) coming next Wednesday!
Right now I am trying to choose the best panels for my setup and that seems to come down to bi-facial vs mono-facial. I will be roof mounting so there will be much less reflection from the surface but I have heard that bi-facial are more efficient on cloudy days and my area has far far too many cloudy days so I am leaning that way right now.
With my current space, amperage, and voltage constraints, it looks like I will be designing 4 parallel strings of 2 panels.
The two front-runners at the moment are:
LONGi Solar LR4-72HPH-445M- These are called bi-facial but say that they have a white backsheet and mono-perc? They would be $0.59/w delivered and this company has all of the racking I need so it would be very convenient order.
Solorever 440w - made in the US, $0.53/w delivered. Signature Solar doesn't have the racking I need so I would likely have higher overall costs if I buy here.
I am definitely open to suggestions if there are better options out there.