Photovoltaic Grid-Connected Inverter SG750MX

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1. Structure of Photovoltaic Grid-Connected Inverter SG750MX Description

A solar inverter, or PV inverter, or Solar converter, converts the variable direct current (DC) output of a photovoltaic (PV) solar panel into

 autility frequency alternating current (AC) that can be fed into a commercial electrical grid or used by a local, off-grid electrical network.

 It is acritical BOS–component in a photovoltaic system, allowing the use of ordinary AC-powered equipment. Solar inverters have

special functions adapted for use with photovoltaic arrays, including maximum power point tracking and anti-islanding protection.

Suitable for 50Hz/60Hz grid, could be used in Asia, North America and Europe.



2. Main Features of the Photovoltaic Grid-Connected Inverter SG750MX

• Transformerless inverter, max. efficiency of 98.7%, CEC efficiency of 98.5% for SG800MX,max. efficiency of 98.6%, CEC efficiency of 98.0% for SG750MX

• Employing a patented thermal management system, the inverter is able to operate from -13˚F to 140˚F (-25˚C to 60˚C), and up to 19,600’ (6,000 m).


• High power density, small equipment footprint

• DC disconnect, AC circuit breaker, separate DC & AC cabinets

• Max. DC input voltage is 1000V, can be mounted on a skid or an e-house, giving maximum design flexibility and lowering installation costs


• Continuous active power control

• Advanced grid support functionality, meet grid requirements around the world

• Full remote and local power curtailment, PF, HVRT, LVRT, FRT controls via ModBus & Ethernet


• Designed for 20+ years of operating life

• NEMA4X electronics cabinet



3. Photovoltaic Grid-Connected Inverter SG750MX Images






4. Photovoltaic Grid-Connected Inverter SG750MX Specification

Input Side Data


Max. PV input power


Max. PV input voltage


Start voltage


Min. operation voltage


Max. PV input current


MPP voltage range


No. of DC inputs

1, 6-12

PV array configuration

Negative ground (standard), Floating or Positive Ground (optional)

Output Side Data


Nominal AC output power


Max. AC output apparent power


Max. AC output current



 <3% (nominal power)

Nominal AC voltage


AC voltage range


Nominal grid frequency


Grid frequency range


Power factor

>0.99@default value at nominal power, adj. 0.8 overexcited~0.8 underexcited

Isolated transformer


DC current injection

<0.5 % In



Max. efficiency


European efficiency


CEC efficiency




Input side disconnection device

DC load switch

Output side disconnection device


DC overvoltage protection


AC overvoltage protection


Grid monitoring


Ground fault monitoring


Over temperature protection


Insulation monitoring


General Data






Operating ambient temperature range

-25~+60(55 derating)

Noise emission


Night power consumption


External auxiliary supply voltage


Cooling method

Temperature controlled air-cooling

Ingress protection rating


Allowable relative humidity range

0~95% no condensing

Max. operating altitude

6000m (3000m derating)

Fresh air consumption

4425 m³/h




RS485/Modbus, Ethernet(Opt.)



5. FAQ of Photovoltaic Grid-Connected Inverter SG750MX

Q1. What is the difference between inverter and solar inverter?

A1. Inverter only has AC inpput, but solar inverter both connect to AC input and solar panel, it saves more power.



Q2. What is the difference between MPPT&PWM?

A2. MPPT has higher efficiency, it can track the max power point and won't waste energy.


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Q:Is the grid side of the grid and the inverter?
Grid-type system power transmission sequence: photovoltaic panels> relays> inverters> relays> electricity load + power grid (both in parallel).
Q:Three-phase photovoltaic inverter grid, the use of phase-locked loop is what?
Photovoltaic inverters for grid-connected photovoltaic power generation systems are primarily capable of receiving DC power from photovoltaic arrays and converting them into sine-wave currents of the same frequency and in phase with the access grid for powering the grid or local loads.
Q:The working principle of photovoltaic grid - connected inverter
In the small-capacity inverter generally push-pull inverter circuit, full-bridge inverter circuit and high-frequency step-up inverter circuit three, push-pull circuit, the step-up transformer neutral plug connected to the positive power supply, two power Alternating current, the output to get AC power, due to the power transistor to ground, drive and control circuit is simple, and because the transformer has a certain leakage inductance, can limit the short circuit current, thus improving the reliability of the circuit. The disadvantage is the low utilization of the transformer, driving the emotional load is poor.
Q:How the output voltage of the PV inverter and the grid-connected voltage are determined
Inverter is the DC power (battery, battery) into alternating current (usually 220V, 50Hz sine wave). It consists of inverter bridge, control logic and filter circuit. Widely used in air conditioning, home theater, electric wheel, power tools, sewing machines, DVD, VCD, computer, TV, washing machine, range hood, refrigerator, video recorders, massage, fan, lighting and so on. In foreign countries
Q:PV grid-connected inverter can directly load it?
Grid-connected inverter is usually equipped with island protection function, can only receive the power grid, if the load directly, the output is disconnected.
Q:PV grid-connected inverter and independent inverter in the control of what is the difference
And you said that the independent inverter, said off-grid inverter it, this inverter can not access the mains, the components of the electricity through the off-grid inverter to the battery charge, the battery at night
Q:What is the difference between a PV grid-connected inverter and an off-grid inverter?
Off-grid inverter is equivalent to their own to establish an independent small power grid, mainly to control their own voltage, is a voltage source.
Q:The function of photovoltaic grid - connected inverter
After some additional voltage buffering, the left side of the bridge is usually 18 ~ 20khz switching frequency, the dc voltage is converted to ac voltage.
Q:Installation and maintenance of photovoltaic grid - connected inverter
Before making an electrical connection, be sure to use the opaque material to cover or disconnect the PV panel. Exposure to sunlight, photovoltaic arrays will produce dangerous voltages. All installation operations must be done only by qualified technicians.
Q:Generally a large grid-connected photovoltaic power plant will have several inverters
Group is the use of a number of grid-connected inverter and grid-connected AC power grid, the advantage is the loss of small, low cost of the cable (because the PV cable is more expensive), eliminating the cost of the convergence box, and multiple

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