Wire Question for 24VDC

When reading about wire for 12V, 24V, and 48V DC circuits, I almost always see folks using "Battery Cable" or "Welding Lead Cable". I know that these cables are very flexible and can carry a lot of amps for their size. However, I have several spools of 10AWG - 19 Strand THHN (PVC inner insulation jacket with nylon outer jacket) that were left over from a previous project. Any reason that I cannot or should not use that wire for solar panels and/or 24VDC battery connections/power?

Someone had posted this link: https://baymarinesupply.com/bosns_corner_wire_sizes

That link does not seem to specify what type of wire is acceptable for their calculations.

Thanks and God Bless!

Kugel

THHN is 90°C for dry and 75°C for wet applications. Marine is 105/75, respectively.

Use the awg chart in my signature.

10 awg can handle 35A @ 75°C and 40A @ 90°C

You can also double up conductors. 2X 10awg is like 7awg and 4X 10awg is like 4awg. Though you should derate them a little bit since you don't have a single wire in free air. I'd fall back to the 60°C rating for multiple 10awg conductors.

Thanks Snoobler!

snoobler said:

THHN is 90°C for dry and 75°C for wet applications. Marine is 105/75, respectively.

Use the awg chart in my signature.

10 awg can handle 35A @ 75°C and 40A @ 90°C

You can also double up conductors. 2X 10awg is like 7awg and 4X 10awg is like 4awg. Though you should derate them a little bit since you don't have a single wire in free air. I'd fall back to the 60°C rating for multiple 10awg conductors.

Click to expand...

"Conductor temperatures not to exceed 105°C in dry locations when rated AWM • and used as appliance wiring material. Voltage for all applications is 600 volts." -- http://www.prolinesafety.com/UserFiles/File/Downloadable Specifications/Copper Building Wire/THHN COPPER.pdf

I use thhn but I spec my breakers and/or fuses to never exceed 90 celcius.