Fronius Primo 12.5-1 Inverter | 12.5kW Grid-Tie | Transformerless | Dual MPPT
The transformerless Fronius Primo 12.5-1 is a high-output, single-phase grid-tied inverter built for larger residential and light commercial PV systems. It features dual MPPTs, NEMA 4X protection, and integrated safety/monitoring options for flexible installs.
Key Specifications
• Model – Fronius Primo 12.5-1
• Inverter Type – Grid-tied, transformerless, single-phase
• Max. permitted PV power (kWp) – 18.75 kW
• Max. usable input current (MPPT1 / MPPT2) – 33.0 A / 18.0 A
• Total max. DC current – 51 A
• Max. admissible input current (MPPT1 / MPPT2) – 49.5 A / 27.0 A
• Operating voltage range – 80 V – 1,000 V
• Max. input voltage – 1,000 V
• Nominal input voltage – 665 V
• MPP voltage range – 260 V – 800 V
• Number of MPPT – 2
• Max. output power – 12,500 W
• Max. continuous output current – 52.1 A @ 240 V / 60.1 A @ 208 V
• Recommended OCPD/AC breaker size – 70 A @ 240 V / 80 A @ 208 V
• Max. efficiency (Lite version) – 97.9%
• CEC efficiency (Lite version) – 96.5%
• Grid connection – 208 / 240 V
• Frequency – 60 Hz
• Total harmonic distortion – < 2.5%
• Power factor (cos φac) – 0 – 1 ind./cap.
• Degree of protection – NEMA 4X
• Night time consumption – < 1 W
• Cooling – Controlled forced ventilation, variable speed fan
• Installation – Indoor and outdoor installation
• Ambient operating temperature range – -40 to 140 °F / -40 to 60 °C
• Permitted humidity – 0 – 100 %
• Dimensions (w × h × d) – 20.1 × 28.5 × 8.9 in (51.1 × 72.4 × 20.6 cm)
• Weight – 82.5 lb (37.4 kg)
• Protective devices – AFCI; Ground Fault Protection with Isolation Monitor Interrupter; DC disconnect; DC reverse polarity protection
• Interfaces – USB (A socket) (standard); 2× RS422 (RJ45 socket) (standard); Wi-Fi/Ethernet/Serial/Datalogger and webserver (optional); 6 inputs or 4 digital inputs/outputs (optional)
• Revenue Grade Metering – Optional (ANSI C12.20-2010 accuracy)
• Compliance – UL 1741-2010 Second Edition (incl. UL1741 Supplement SA 2016-09) for California Rule 21 and Hawaiian Electric Co Rule 14H; UL1998 (for functions: AFCI, RCMU and isolation monitoring); IEEE 1547-2003; IEEE 1547.1-2005; ANSI/IEEE C62.41; FCC Part 15 A & B; NEC 2017 Article 690; C22.2 No. 107.1-16; UL1699B Issue 2-2013; CSA TIL M-07 Issue 1-2013
