Cable calculations, protection & switching selection

Full AC and DC cable sizing, protection design, and switching selection for solar PV and battery storage installations.

What this service covers

The cabling, protection and switching equipment in a solar PV or battery installation might be the least visible part of the project, but it’s one of the most consequential. Undersized cables overheat and oversized cables cost more than they should, plus incorrect protection devices can fail to isolate a fault when needed. Each of these decisions has a direct impact on safety, performance and capital cost.

We provide the full set of calculations and selections, ready for the installer.

What our service covers

Every BMG cable and protection service includes:

Full AC and DC cable sizing calculations
Voltage drop, thermal derating, grouping and installation method assessment
Short-circuit level assessment and fault current evaluation
Selection of circuit breakers and fuses
Selection of isolators and switching devices

Selection of grid protection and metering equipment

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The calculations behind a system that lasts

Cable and protection selection is a quietly significant part of the cost stack on any commercial PV system. We calculate it precisely by sizing correctly for the load, the route, the grouping, and the long-term thermal environment rather than relying on conservative defaults that drive cost up unnecessarily.
The result is a system that performs as it should, complies as it must, and isn’t paying for capacity it’ll never use.