Blog

An SPD that has failed is not automatically a bad device. Most surge protection devices are sacrificial by design: they absorb surge energy, give up a little of their capacity each time, and eventually reach a condition in which they can no longer clamp anything useful and must come out of service. Ask why does […]

Compare powder-coated steel, stainless steel, aluminium, ABS/PC and GRP/polyester PV combiner box enclosures on corrosion, UV ageing, heat dissipation, weight, bonding, IP and cost, with an environment-based selection matrix.

Ask when should an SPD be replaced and most answers stop at the status window. That is one input, and on its own a weak one: it shows that a device has reached end of life, never that a device is still fit for service. An SPD can be electrically exhausted while the window still […]

Why a solar combiner box needs both a DC MCB and a DC SPD: the division of labour between overcurrent and transient overvoltage protection, why neither device can substitute for the other, how they coordinate on the DC bus including the SPD backup protection requirement, and how the pairing changes between 1000 V DC and 1500 V DC systems.

“Combiner box vs junction box” is one of the most common points of confusion in PV design, and it is not a cosmetic one. The two enclosures look similar on a wall, are both described loosely as “the box where the strings are terminated”, and are not interchangeable. A junction box is a passive termination […]

Solar combiner box maintenance is the cheapest protection a PV asset can buy. A short scheduled inspection finds a hardening door gasket, a slack terminal or a saturated desiccant while they are still minor defects; the same three found two years later are an earth fault, a discoloured busbar and a lost production week. This […]