Webmasters note: I highly recommend the DIY combiner kit. You get more value for money and its cheaper.

The Microcare Breakerless Low Voltage Combiner & Surge Protection Unit is a critical component of any PV Solar installation providing functions such as safety and surge protection for your system. The unit   offers isolation between the DC voltages that are generated by the PV modules and the solar installation allowing for safety while working or maintaining the system. With fusing and short circuit protection the PV modules and components can operate optimally with lightning protection included. Combining multiple   series strings from the PV modules the unit allows for a single parallel connection to the MPPT charge controller.

• Available for combining 1 to 3 Series PV Strings into 1 Parallel Output
• Protection MOV - Surge / Lightning 
• Isolation of PV DC voltages
• Fuse Protection
• Easy gland cable connectors
• Easily connect PV arrays to solar equipment
• IP65 container