Re Question with the voltage that you will be using.
AWG # 4
Depends on the size of the sub-panel in that garage. If you are installing a 60 amp sub-panel 400 feet away from the main service panel then use AWG # 4.
For that distance I would run AWG # 3 copper and install a sub-panel.
A #8 copper wire with an insulation factor of 75 or 90 degrees C is rated at 45 amps.
I would install a 60 amp sub-panel and use AWG #3 copper.
Use #10 copper.
Depends on the size of the sub-panel in that garage. If you are installing a 60 amp sub-panel 400 feet away from the main service panel then use AWG # 4.
A #1 copper wire with an insulation rating of 90 degrees C is rated at 140 amps.
For that distance I would run AWG # 3 copper and install a sub-panel.
A #8 copper wire with an insulation factor of 75 or 90 degrees C is rated at 45 amps.
Yes, they are the same size wire.
I would install a 60 amp sub-panel and use AWG #3 copper.
A #6 copper wire with an insulation factor of 75 or 90 degree C is rated at 65 amps.
This is a voltage drop question. A voltage must be stated to answer this question.
Use #10 copper.
# 6 copper wire.
The voltage of the solar panel is less important than the total amperage. Proper wire size is determined by amperage that will be going through the wire. Wire INSULATION determines the voltage that a wire can carry.
A 200 amp service panel will require a # 4 bare copper ground wire.