Solreach PV Smart Rapid Shutdown Device

Q1: What is NEC 690.12 and why does the SolarTrace rapid shutdown device satisfy it?

NEC 690.12 is a US National Electrical Code requirement mandating that rooftop PV systems reduce conductor voltage to 30V or less within 30 seconds of shutdown initiation, to protect firefighters and emergency responders from electrocution risk. The SolarTrace device reduces each module's output voltage to below 1.5V — well within the 30V limit — in under 30 seconds from trigger. The PLC-based communication method is recognised under SunSpec Alliance specifications as a compliant rapid shutdown initiation system, making the SolarTrace a code-compliant solution for US residential and commercial rooftop PV installations.

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Q2: How does Power Line Communication (PLC) work in this rapid shutdown system?

PLC transmits control and monitoring signals over the same DC cables that carry PV power — eliminating the need for separate signal wiring between the inverter and the rooftop shutdown devices. The inverter (or a standalone rapid shutdown initiator) injects a coded PLC signal into the DC string. Each SolarTrace unit receives this signal and responds by triggering its shutdown relay, dropping the module's output to below 1.5V. Because the existing wiring infrastructure carries both power and signal simultaneously, PLC-based systems are significantly faster to install and lower in BOS cost than systems requiring dedicated communication cables.

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Q3: What is the maximum string size and how many SolarTrace units does a typical residential installation require?

Each SolarTrace unit connects two PV modules, and a single string supports up to 30 modules. A standard US residential system of 20 panels (400W each, 8KW total) would require 10 SolarTrace units — one per two modules — installed at the rooftop level. For a 30-module string (the maximum), 15 units are required. String voltage is managed within the 10–80VDC per-unit operating range, and maximum output per string is 1600W at ≥99.5% efficiency. Multiple strings can be deployed in parallel on the same inverter, each with its own set of SolarTrace units.

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Q4: What happens to energy production during normal operation — does the SolarTrace cause any yield loss?

No measurable yield loss occurs under normal operating conditions. Conduction efficiency is ≥99.5%, meaning less than 0.5% of generated power is dissipated in the device. For a 400W module producing 1,600kWh per year, the SolarTrace accounts for at most 8kWh of loss annually — commercially negligible. The built-in bypass output further protects yield: if a SolarTrace unit develops a fault, bypass mode maintains the electrical path to the inverter, preventing a single device failure from disabling the entire string.

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Q5: What module-level data does the SolarTrace cloud platform provide, and how is it accessed?

The SolarTrace platform provides per-module real-time data including: DC voltage, current (Imp up to 20A, Isc up to 25A), internal device temperature, instantaneous power output, and cumulative energy generation. Data is transmitted via PLC over the DC string cables and aggregated at the inverter or gateway level before upload to the cloud. Installers, O&M teams, and system owners access dashboards via APP (iOS/Android) or Web browser. Fault alerts, underperformance flags, and shutdown event logs are all recorded and exportable for O&M reporting.

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Q6: Is the SolarTrace compatible with all inverter brands, and does it require a specific inverter to initiate shutdown?

The SolarTrace uses SunSpec-compliant PLC signalling, which is supported by most major inverter brands including SMA, SolarEdge (non-optimizer strings), Fronius, Growatt, Deye, and Sungrow. For inverters without native SunSpec PLC support, a standalone SunSpec-compatible Rapid Shutdown Initiator (RSI) device can be installed at the inverter to generate the PLC trigger signal. Solreach's technical team can advise on inverter compatibility and RSI pairing for specific project configurations prior to order.

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Q7: What are the OEM and project-scale supply options for the SolarTrace rapid shutdown device?

Solreach supports OEM white-label supply of the SolarTrace device for solar distributors, EPC contractors, and inverter brands wishing to bundle rapid shutdown compliance into their product offering. Custom branding, packaging, and documentation are available from a minimum order quantity confirmed with Solreach sales. For large-scale projects (commercial rooftop, carport, or ground-mount installations requiring hundreds to thousands of units), Solreach can provide project-specific pricing, logistics coordination, and technical commissioning support documentation including NEC 690.12 compliance declarations.