I just mentioned the SunnyBoy because they have already done this. They will not discuss this unless one is a genny manufacturer. The unit I am using for the solar cells currently is the Trace SunTie, see specs below.
Electrical Specifications
AC Output Voltage (Nominal) 240 VAC
AC Output Voltage Range 211-264 VAC
Continuous Power (@ 45 °C) STXR2500 2500 VA
Efficiency (Peak) 91%
AC Output Characteristics Current Source
Frequency (Nominal) 60 Hz
DC Input Voltage (Nominal) 48 VDC, Typically 4 nominal 12 VDC PV modules, in series
Sunsweep MPPT Voltage Range 44-85 VDC
Sunsweep MPPT Full Power Output STXR2500 52-75 VDC
Absolute Max PV Open Circuit Voltage 120 VDC
Waveform Sine Wave, Voltage referenced - current source
Total Harmonic Distortion Less than 5% at rated power per IEEE929 and UL 1741 (all models)
General Specifications
Operating Temperature Range -38° F to 113° F (-39° C to 45° C) (A full temperature versus performance curve is available in the manual)
Enclosure Type Outdoor, powder coated aluminum enclosure, fully screened, rainproof
Optional rainshield required for outdoor installation
Unit Weight 35 lb (16 kg)
Shipping Weight 40 lb (18 kg)
Inverter Dimensions (H x W x D) 33 x 13 x 5" (83 x 34 x 13 cm)
Shipping Dimensions (H x W x D) 38 x 16 x 10" (94 x 39 x 24 cm)
Mounting Vertical wall mount only
Altitude 15,000' (4,572 m)
Warranty Five years (applicable to products manufactured after Feb 03)
Part Numbers STXR2500 - Sun Tie XR Inverters
STRS - Rainshield
STRM - Remote Meter
Features & Options
Forced Air Cooling Standard dual speed DC brushless fan
Islanding Protection Standard over/under AC voltage and frequency detection plus active islanding protection
Meets IEEE 929 and UL 1741 requirements
User Display Standard backlit alphanumeric LCD display for system status and daily energy harvest (Wh)
AC Disconnect Standard double-pole 15 amp, 240 VAC branch rated circuit breaker
DC Disconnect Standard single-pole 100 amp, DC rated circuit breaker
Remote Monitor STRM - optional remote display unit for status, resettable Wh meter, tech menu, and daily energy harvest with 50' cable
Rain Shield STRS - optional protection rain shield for outdoor installation
PV Ground Fault Protection System Standard on STXR1500 and STXR2500
PV Combiner Board Standard STXR2500 with 6 fused inputs, 20 amps maximum per input
Lightning Arrestor AC/DC Protection Standard on all models
Regulatory Approvals
UL Listed to UL 1741 - 1st Edition
cUL Listed to CSA 22.2 No. 107.1-95
Thanks
Garry