It's standard practice for electricians to leave at least six inches of wire in wall boxes. That way, you've got enough slack to install a new outlet or switch. But if you're short on wire in a wall ...

TE’s SOLARLOK SLK 2.0 DC plug and splice connectors connect the PV cable to the solar panel in field installations with extended voltage ratings of 1500V TUV/IEC and UL. Image: TE TE Connectivity (TE) ...