25mm2 4-core 250m rolls 102 kg each Aluminium Cable

Type 0.6/1kV LOBAC XLPE suitable for up to 120 vdc in the ground direct burial

Can be used in 2 core at 50mm^2 each, you will need 1 drum of cable for this:

Each 250m run can deliver the following Watts at about 5% loss

• 24vdc (28 nominal) 250m long 100 W
• 48vdc (56 nominal) 250m long 400 W
• 120vdc (120 nominal) 250m 1900W

(To reduce to 5% loss you will need to run 2 lengths of this cable)

Each 250m run can deliver the following Watts at about 10% loss

• 24vdc (28 nominal) 250m long  200 W
• 48vdc (56 nominal) 250m long  800 W
• 120vdc (120 nominal) 250m long 3800W

(To reduce to 5% loss you will need to run 2 lengths of this cable)

As a rule of thumb for 8-10% loss for long runs using this cable:
Size in mm2 approx = current in cable (amps) x length (m) / 100
Divide this by 0.6 for aluminium wire

So for example 1700W at 56 vdc at 125m long is 1700/56 = 30.4 amps

Cable size = 30.4 x 125 / (100) = 38 mm2 copper or 63mm2 aluminium