INSTALLATION and OPERATION USER MANUAL UBIQUITI SM SM-MI-250 MICROINVERTER
Page |1 PVP-0001 Ver1.2 Contact Information 2580 Orchard Parkway San Jose, CA 95131 http://www.ubnt.com/contact/ info@ubnt.com PVSupport@ubnt.com FCC Compliance Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Page |2 Contents IMPORTANT SAFETY INFORMATION ......................................................................3 Safety Symbols ..................................................................................................................................... 3 Safety Instructions................................................................................................................................ 3 ABOUT UBIQUITI MICRO INVERTERS ............................................................
Page |3 IMPORTANT SAFETY INFORMATION READ THIS FIRST & SAVE THESE INSTRUCTIONS. This manual contains important instructions for the installation and maintenance of UBIQUITI SM-MI-250 micro inverters. Before installing, please read these safety instructions specifically. Take special care to follow the warnings indicated on the unit itself as well as the safety instructions listed below.
Page |4 Do not disconnect the DC power source from the UBIQUITI micro inverter without first disconnecting the AC power source. Both AC and DC power sources must be disconnected before servicing. Be aware that DC power/voltage is generated when the photovoltaic array is exposed to light. WARNING! Switch off the circuit breakers before installation and wirings. DANGER! For safety remove all conductive jewelry or equipment during the installation or service of the device parts, connector and/or wiring.
Page |5 ABOUT UBIQUITI MICRO INVERTERS General Overview Thank you for choosing UBIQUITI’s SM-MI-250 micro inverters as a key component in your solar power system. SM-MI-250 converts DC power (generated by the solar module) to AC power (powers your home appliances). The UBIQUITI micro inverter is installed on the back of each solar module; and connects directly to the electric utility grid without the need for a string or central inverter.
Page |6 TECHNICAL SPECIFICATIONS INPUT DATA (DC) Recommended input power (STC) 210 - 300 W Maximum input DC voltage 45V Peak power tracking voltage 22 - 36 V Operating range 16 V - 45 V Min/Max start voltage 22 V / 45 V Max DC short circuit current 15 A Max input current 9A PV backfeed current 0A Input Input/ Output: DC 36V AC 240V/ 60Hz OUTPUT DATA (AC) Rated output power 250W Nominal output current 1.
Page |7 BEFORE INSTALLATION Review and follow the instructions in this section before installing UBIQUITI SM-MI-250 micro inverters. Layout PV System The optimal PV array layout will need to be planned before installation. The layout/plan will affect the wiring and cabling schemes and will need to be adjusted accordingly. The layout will also need to account for the constraints of the distance between each PV module due to the cable length.
Page |8 Residential: Vendor: Citel, Part Number DS72RS-120 or DS73RS-120 Application: DS72RS-120 is applied when N-G is bound together, or DS73RS-120 were N-G is unbound. Commercial: Vendor: Citel, Part Number SP-120 Application: Branch panel protection See the vendor datasheet for DS70R, (which includes the DS72RS-120) or for SP-120 at www.citelprotection.
Page |9 UBIQUITI SM-MI-250 INSTALLATION PROCEDURE The following section list steps on how to install the UBIQUITI SM-MI-250 micro inverter onto PV module. Before installing, review and follow all important safety instructions listed in this section: Step 0: Please ensure you have all the components mentioned as below. Step 1: Measure AC voltage on each phase at the Site Measure grid voltage at the point where trunk cables intend to be connected.
P a g e | 10 Step 3: Arrange and fasten the cable. Step 4: Plug DC connector into MI. Step 5: Complete all modules following by step 0 to Step 4 before roof installation. Step 6: Combine Male and Female connector between AC modules.
P a g e | 11 Step 7: Review the layout and check the voltage range again. Voltage between red wire and black wire should be closed to 240V. Please check and adjust layout before operating system. The wires in the AC cable are identified by color: L1 is sheathed in Red, L2 is sheathed in Black, Neutral is sheathed in White and Ground is sheathed in Green. We put the SM-SP-250W module on the structure/racking, and connect the AC cable before fixing the SM-SP-250W module on the racking.
P a g e | 12 There are some optional materials/accessories for different installation requirements, users could evaluate and count the quantities by below sheet.
P a g e | 13 Step 8: With this installation is complete, to enable the I-cloud function of data logger, please refer to next chapter “Communication System Enable “. WARNING Make sure the AC cable and terminator do not touch the roof, using cable clips or tie wraps secure AC trunk cable with structure/racking. Ensure that all cabling is securely located under the PV module and away from roof surface. WARNING Correct AC grounding and short circuit protection must be provided to ensure operational safety.
P a g e | 14 Important Notification GFDI fault GFDI fault is defined as an unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment or earth. When a Ground fault occurs, the GFDI will trigger the LED light to flash in alternating Orange and Red colour, and SM-MI-250 will automatically disconnect all the conductors as a safety precaution.
P a g e | 15 Disconnect the grounding wire or washer from the micro inverter. Remove the micro inverter from the PV racking. WARNING Do not leave the disconnected SM-SP-250W module and expolse connectors for an extended period of time. If the removed micro inverter will not be replaced with another micro inverter immediately, connect a sealing cap to the connector.
P a g e | 16 Manufactured by: UBIQUITI 2580 Orchard Parkway San Jose, CA 95131 Tel: http://www.ubnt.
