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MPPT to Enhance Power Output by 30%!

110V 1200W Micro Grid Tie Inverter

For Solar Panel

Features:

Maximum Power Point Tracking (MPPT) to optimize output power
FOUR indendent MPPT input circuit allows power optimization on 4 sets of solar panel
Standard MC4 input ports for easy and safe installation
Stackable to another micro inverter with the included power cable
Pure sine wave output
Anti-Island Protection: Inverter will stop output during black out
Over-temperature, short circuit, and overload protection
IP65 Waterproof Rating

Input Specifications:

	1) PV input (MC4) 1 2) PV input (MC4) 2 3) PV input (MC4) 3 4) PV input (MC4) 4 5) AC input- connect to the previous 6) AC input- connect to the next 7) LED display

	Recommended PV Modules	300W x 4 sets
	Maximum DC input Range	50V
	MPPT Voltage Range	14-20V / 25-40V
	Operation Voltage Range	10.5-30V / 22-50V
	Individual Circuit Maximum Input Current	20A

Output Specifications:

	Output Voltage	@120VAC
	Peak Power Output	1200W
	Rated Output Power	1150W
	Rated Output Current	9.58A
	Rated Voltage Range	90-160VAC
	Rated Frequency Range	50/60Hz Auto
	Power Factor	>98%
	Maximum units per Branch Circuit	3 Units (single phase)
	Maximum Current per Branch Circuit	30A

	Efficiency
	MPPT Efficiency	99.5%
	Maximum Output Efficiency	92%
	Night Power Consumption	<50mW Max
	Anti Island Protection	Yes, Inverter will disconnect from grid during black out
	Output Current Waveform	Pure Sine Wave

Mechanical Specifications:

	Ambient Temperature Range	-40'C - 60'C
	Operating temperature range	-40'C - 82'C
	Dimension (L x W x H)	370 x 305 x 38 mm 14.56 " x 12" x 1.50"
	Weight	2.85kg 6.28lb
	Waterproofrating	IP65
	Cooling	Natural Convection
	Casing	High quality finned aluminum to act as heat sink for fast heat dissipation
	Display	1 Red LED

Other Specifications

	Power Transmission	Reverse Transfer, Prirotiy Loads first
	Electromagnetic Compatibility	EN50081.part1 / EN50085.part1
	Grid Distrubance	EN61000-3-2 Safety EN62109
	Grid Detection	DIN VDE 1026 UL1741

What are included:

1X 1200W Micro Grid-tie Inverter
1X AC Cable
Instruction manual
Mounting Bracket
Screws

Maximum Power Point Tracking (MPPT):

What is Maximum Power Point Tracking (MPPT)? MPPT is a techinque we implemented to get the maximum possible power from a solar panel. When trying to characterize the output of a solar panel mathematically, it can be represented by an IV-Curve (shown below). The equation for Power is P = IV. Where I is the Current, V is the Voltage, and P is the possible output Power. Each point on the curve is a possible combination for output power and our goal is to find the best combination to obtain maximum power.

In simple terms, we are trying to get the biggest rectangle to fit under this so called IV-Curve, the bigger rectangle we can fit, the more power we get. Below are graphs to help you understand the idea better. This is a comparison between inverters with and without MPPT on an 85W solar panel. Please note that different solar panels will have slightly different IV-Curves.

No Tracking Vs Tracking


Figure 1 No MPPT, with voltage fixed 17.5V P = 17.5V x 4.6A = 80.5W	Figure 2 With MPPT, amount of current and voltage to draw are calculated P = 17V x 4.95A = 84.15W

As we can see, Figure 2 is able to 84.15W with MPPT while in Figure 1, we can only get 80.5W. This is 4.5% increase in power output. Why do we care? Because solar panels are still quite expensive these days, and the increased power output will directly affect our return on investment (ROI). In addition, depending on weather, time of the day and amount of solar irradiation the panel receives, the IV curve will move along the Y-axis to reflect the possible increase / decrease in potential power output, and cause the maximum power point to shift along as well. Coming up are illustrations to visualize this idea.

IV-Curves Under different weather conditions

Figure 3.
Sunny, Clear Sky days in Summer
600 ~ 1000 W/m2

	No MPPT	MPPT
Power	80.5W	84.15W
Color	Red & Yellow	Yellow& Green
Percent	N/A	+4.5%

Figure 4.
Scattered Clouds or Partly Cloudy days in Summer
300 ~ 600 W/m2

	No MPPT	MPPT
Power	42.0W	46.4W
Color	Red & Yellow	Yellow& Green
Percent	N/A	+10.5%

Figure 5.
Cloudy or fog days, dawn or dusk in Summer
100 ~ 300 W/m2

	No MPPT	MPPT
Power	5.25W	14.25W
Color	Red & Yellow	Yellow& Green
Percent	N/A	+171%

Figure 3 - 5 illustrate the power gain in different weather condition with MPPT compare to a non-tracking inverter that locks voltage at 17.5V. While 17.5V is randomly chosen, it does show what would happen in real life when there is not MPPT. Studies have shown, by making use of MPPT, there will be an average of 30% increase in power production. Since the maximum power point is a variable, we have implemented a tracking algorithm that utilizes the micro processing power of our inverter to calculate the optimum voltage and current to maximize our energy harvest.

Increased Power Rating:

In 2008, when we designed the first generation inverter, what we had in mind was an inexpensive device to allow the public to have a chance to test out renewable energy production and promote the green movement at an affordable price range. As people's environmental awareness increased over the years, the demand for bigger systems also increase. Therefore, once again, the power of this inverter has increased to accomodate market demand.

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