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Installed @ a company during 2016 for a period of 3 months  - company sunsequently closed down/ liquidated in the same year. Item has been in storage ever since Still in excellent condition. Specifications Model Sunny Boy 5000TL Series Sunny Boy Manufacturer SMA Solar Mechanical Type Grid Tie - Central Operating Temperature Range -40° C - 60° C Enclosure NEMA 3R Cooling Convection Dimensions (W x H x D) Inverter: 19.3" x 20.5" x 7.3" Disconnect: 7.4" x 11.7" x 7.5" Weight Inverter: 57 lbs Disconnect: 8 lbs Shipping Method Ground Input (DC) Recommended PV Power (STC) 5250 W Max Voltage 600 V Peak Power Tracking Voltage 175 V - 480 V Min Start Voltage 150 V Max Current 15 A Output (AC) Maximum Output Power 208 VAC: 4250 W 240 VAC: 5000 W Nominal AC Voltage 208 V / 240 V Voltage Range 208 V: 183 V - 229 V 240 V: 211 V - 264 V Frequency 60 Hz Max Current 15 A Detailed Description The Sunny Boy 3000TL-US/4000TL-US/5000TL-US represents the next step in performance for UL certified inverters. Its transformerless design means high efficiency and reduced weight. Maximum power production is derived from wide input voltage and operating temperature ranges. Multiple MPP trackers and OptiTrac Global Peak mitigate the effect of shade and allow for installation at challenging sites. A unique Emergency Power Supply feature provides daytime power even in the event of a grid outage. High performance, flexible design and an innovative feature set make the Sunny Boy TL-US series the first choice among professionals. Emergency Power Supply One of many unique features to the TL-US residential series is its innovative Emergency Power Supply ability. With most grid-tied inverters, when the grid loses power, so does the solar-powered home. SMA's solution allows daytime energy to be isolated from the grid and be fed directly to the home via a dedicated power socket, providing residents with access to power as long as the PV system generates electricity. Simple installation As a transformerless inverter, the TL-US residential series is lighter in weight than its transformer-based counterparts, which makes lifting and transporting the new inverter easier than before. A new wall mounting plate features anti-theft security and makes hanging the inverter quick and easy. A simplified DC wiring concept allows the DC Disconnect to be used as a wire raceway, saving labor and materials. Leading monitoring and control solutions The new TL-US residential line features more than high performance and a large graphic display. The monitoring and control options provide users with an outstanding degree of flexibility. Integrated Zigbee, a wireless communications standard often used for home energy management, and numerous wired options allows for a highly controllable inverter and one that can still be monitored on Sunny Portal from anywhere on the planet via an Internet connection. Whether communicating through Zigbee or SMA's new wired, plug-and-play WebConnect, installers can find an optimal solution to their monitoring needs. Transformerless design The Sunny Boy 3000TL-US / 4000TL-US / 5000TL-US are transformerless inverters, which means owners and installers benefit from high efficiency and lower weight. A wide input voltage range also means the inverters will produce high amounts of power under a number of conditions. Additionally, transformerless inverters have been shown to be among the safest string inverters on the market. An industry first, the TL-US series has been tested to UL 1741 and UL1699B and is in compliance with the arc fault requirements of NEC 2011. Increased energy production OptiTrac Global Peak, SMA's shade-tolerant MPP tracking algorithm, quickly adjusts to changes in solar irradiation, which mitigates the effects of shade and results in higher total power output. And, with two MPP trackers, the TL-US series can ably handle roofs with multiple orientations or specific shaded areas. An extended operating temperature range of -40 °F to +140 °F ensures power is produced in all types of climates and for longer periods of time than with most traditional string inverters.