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Our house, when built, was wired for a battery system, plus it had cabling installed for an emergency power supply (both of these cables sit redundant). We're at the stage now where we are seriously considering a battery and I'm looking at the Givenergy All In One battery system. The installation documentation for the All in One states "...minimum cable size requirements for the All in One are 6mm2 minimum" The existing unused battery cable is 4mm2 and the existing unused cable for the EPS is 2.5mm2. Running a new 6mm2 cable to the position needed would be virtually impossible so I asked the installer the stupid question, does 4mm2 + 2.5mm2 = 6.5mm2, in other words can I combine the two existing cables and use them as a parallel supply? To my surprise he didn't laugh at me but instead said he'd check with the manufacturer. This is the manufacturers response - a bit of a non answer "The wiring would have to be as per UK electrical Regs in terms of wiring and connections". The installer is going to check what they actually mean, but can someone help me here, is it lunacy to even suggest such a thing or is it safe/acceptable to parallel the supply with certain protections in place? Any guidance gratefully received.
