This Victron adapter cable lets an MC4 male connector plug into MC3 female equipment, so panels or extension leads terminated in MC4 can join older MC3-based charge controllers and combiner boxes without rewiring. At 15cm long, it stays neat inside a junction box or panel array.

Key features

• Connector A, MC4 male
• Connector B, MC3 female
• Cable length, 15cm
• Weight, 0.035kg (35g)
• SKU, SCA500100000

Product overview

MC4 is the current standard for solar panel wiring; MC3 was common on earlier installations and legacy charge controllers. Where the two meet, a direct connection is not possible without an adapter like this one. The male MC4 end accepts the female MC4 connector found on most modern panels and extension cables, while the female MC3 end plugs into the male MC3 output of older gear. The orientation is fixed, so check connector genders on your own equipment before ordering.

Applications

• Connecting MC4-terminated solar panels to legacy MC3-compatible charge controllers
• Adapting modern solar extension cables to older MC3 combiner boxes or junction points
• Retrofit installations where MC3 equipment is retained alongside newer MC4 components
• Off-grid systems still running older charge controllers with MC3 inputs

Installation notes

Check connector gender and type on both the panel side and the equipment side before fitting. MC4 and MC3 connectors are not interchangeable without an adapter, and mismatched pairing can cause poor contact or damage. Solar DC wiring carries live voltage whenever panels are exposed to light, so this work should be carried out by a qualified electrician or accredited installer. On grid-connected systems, check compliance with G98 or G99 requirements as applicable.

What's in the box

• 1 x Solar adapter cable, MC4 male to MC3 female, 15cm