Today, let’s focusing on Engineering Recommendations G98 and G99 based on the installation’s size.
When it comes to PV installations, size matters, not only in terms of capacity but also in the rules that apply. For systems generating up to 16A a.c. output per phase, the guidelines of Engineering Recommendation G98 come into play. To give you an idea, this translates to around 3.68kW for single-phase (at a nominal voltage of 230V) and 11.04kW for three-phase (at a nominal voltage of 400V) setups.
The beauty here is that these systems typically don’t require any extra commissioning steps beyond those already outlined in documentation.
But if your PV system exceeds the 16A per phase mark, say hello to Engineering Recommendation G99. Here’s where things might get a bit more intricate.
Depending on whether you’re rocking G99 type-approved inverters or larger systems equipped with protection relays (aka “G98 relays”), you might need to roll out additional commissioning tests. These tests are like double-checks, making sure your grid interface protection circuits are working as they should, all while keeping safety front and center.
Larger systems, especially those stretching past 50kWp, might even call for the Distributed Network Operator (DNO) to have a peek at these tests. It’s a collaborative effort, ensuring everything’s aligned with their requirements. Remember, they’ve got a vested interest in the smooth functioning of the grid. Whether it’s overseeing tests or establishing test procedures, working hand in hand with your DNO is the way to go. And guess what? The DNOs have neat little forms ready to help you document your commissioning journey.
Commissioning is more than a mere checklist; it’s about guaranteeing your PV system’s operational prowess. So, whether you’re cruising through G98 or navigating the intricacies of G99, remember that these guidelines are here to steer your solar journey toward a brighter and safer horizon.
Feel free to share your experiences, insights, and questions in the comments below!
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