Cable, Lugs & Crimping Tools

DC Cable Sizing Tool

This online cable size calculator tool makes it easy to establish the correct size of cables for any DC power system. 

DC Wire Sizing Calculator - Round your results up to the next cable size

Cable sizes: 'Free Air cables' can carry the following Amps (cables in conduit or insulated walls will reduce the Amps you can put through the cable).  The table below shows our recommended max amps to put though the DC solar and battery cable sizes we supply in free Air and in ducting, if in insulated walls you will need to reduce further.  The amount in brackets is the absolute max and must never be exceeded. The 6mm and 10mm refer to solar cable. The remaining sizes refer to battery cable.

Cable Size

Max Amps in Free Air

In Duct

Volt Drop 

Ohms/KM

6mm²

70A

 

3.39

10mm²

98A

 

1.95

16mm²

94A (115Max)

80A (91Max)

2.9

35mm²

150A (188Max)

115A (139Max)

1.35

50mm²

190A (228Max)

140A (164Max)

0.98

70mm²

260A (291Max)

180A (203Max)

0.67

95mm²

325A (354Max)

200A (239Max)

0.49

The information contained within this table is for guidance only and is subject to change without notice or liability. All the information is provided in good faith and is believed to be correct at the time of publication. When selecting cable accessories, please note that actual cable dimensions may vary due to manufacturing tolerances.

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Premade MC4 6mm Solar Cable 50cm - (Useful when panels or branch connectors do not reach) 50cm length
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£4.17 +vat
£5
Heat Shrink Butt Crimp Terminal Connectors For 4mm to 6mm Square Cable
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£0.42 +vat
£0.50
Lighting Cable - 5 Meter - 2 core for LED lights
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£5.00 +vat
£6
Premade MC4 6mm Solar Cable 1 meter - (Useful when panels or branch connectors do not reach) 1M length
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£6.25 +vat
£7.50
Premade MC4 6mm Solar Cable 3 meter - (Useful when panels or branch connectors do not reach) 3M length
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£10.00 +vat
£12
1.5mm² White 3 Core Flexible AC Cable 230VAC - 10 Meter Reel/Drum
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£16.67 +vat
£20
Premade MC4 6mm Solar Cable 2 meter - (Useful when panels or branch connectors do not reach) 2M length
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£12.50 +vat
£15
2.5mm² 3 Core Flexible AC cable Rubber sheath, copper core 230VAC - per meter
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£3.33 +vat
£4
16A Hookup 10A 15M Roller Mobile Mains Power Unit With LED Light
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£58.33 +vat
£70
4mm² Blue sheath Tri-rated Cable 12VDC 41A - per meter
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£1.67 +vat
£2
Price:
£66.67 +vat
£80
Extension Lead 16A 230V 10m
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£16.67 +vat
£20
Victron Shore Power Cable 16A 230V 15m
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£150.00 +vat
£180
Victron Shore Power Plug 16A
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£67.00 +vat
£80.40
Weather Resistant Rubber Flex Cable 0.75mm sq x 25m Drum
Availability: In Stock - Delivery 1-3 days or collect from near Lewes
Price:
£20.83 +vat
£25