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Case Study: SolarEdge7600 Energy Production
Jul21

Case Study: SolarEdge7600 Energy Production

A 10.2 kW system using the SolarEdge 7600 Inverter was evaluated to compare the actual production against the production estimates produced by the layout design tool. The system evaluated was commissioned to operate since February, so the production values were compared from February to June of the year 2016. The results show that the estimates are very close to the actual production values. The system produced about 3.5% more than the estimates show overall in the time period from February to June. The results also show that the system actually produces about 3.5% percent more overall than the estimates in the PV layouts. This shows that the estimates attained via the PVWatts government website through our design tool are indeed accurate. The case study also shows that the SolarEdge 7600 Inverter is capable of handling a 10 kW system.   Equipment: 40x Gigawatt 255W Solar Panels 40x SolarEdge P300 Power Optimizers 1x SolarEdge 7.6kW Inverter w/ Zigbee Wireless Monitoring Location: Camaloa Avenue,Lake View Terrace CA...

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Pure Sine Wave Inverters vs. Modified Sine Wave Inverters
Jun19

Pure Sine Wave Inverters vs. Modified Sine Wave Inverters

True Sine Wave or Modified Sine Wave?Because the AC electricity from the electric grid is in the form of sine wave, the inverters we use aim to produce a current that is as close to sine wave as possible.  While modified sine wave inverters present an inexpensive alternative, there is no comparison to the clean, undistorted sine wave provided by pure sine wave inverters.   Pure Sine Wave Inverter    A pure sine wave inverter, also known as a true sine wave inverter, produces a clean, undistorted electrical output.  Depending on the manufacturer of the product, pure sine inverters have a perfect sine wave output that’s in phase with the AC grid of the utility company.  Because of the sinusoidal form, pure sine wave inverters are used for grid-tie solar systems and work for virtually any AC load.  Cotek SK3000-148, 3000 Watt 48V Pure Sine Wave Inverter Because they produce no harmonic distortions in the frequency, pure sine wave inverters allow any electronic device to function well without overheating or creating an irritating “buzz” sound.  Though pure sine wave inverters are undoubtedly the best and most versatile kind of inverter, they are more expensive than modified sine wave inverters.   Pure sine wave inverters are necessary for highly sensitive products such as digital clocks, audio equipment, and video-game consoles.  As a general rule of thumb, if you’re powering any electronics, you’ll probably want to stick with a pure sine wave inverter.  The image below displays the difference between a pure sine wave and a modified sine wave.   Modified Sine Wave Inverters   The cheaper alternative to a pure sine wave inverter is a modified sine wave inverter.  A modified sine inverter converts DC electricity to a nonsinusoidal AC wave that is “modified,” or distorted.   When an inverter produces modified sine wave, the voltage output (represented in the Y axis of the image) essentially jumps from zero volts to positive, where it plateaus and drops back to zero, to negative voltage, and then back to zero again. This is signified in the image by the squared edges seen in the modified sine wave, which is contrasted by the smooth oscillation of a voltage that is produced by a pure sine wave inverter.  The modified sine wave is a stepped waveform that is designed to mimic a true sine wave.  Because it is not a clean form of energy, modified sine wave does generate a certain kind of interference called harmonic distortion (though not as much as a square wave). Modified sine wave inverters can work for the majority of low-end appliances, but take caution when using them for your...

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What is anti-islanding on a grid tie inverter?

Linemen who work for the utility company have a dangerous job because they are the people who are dispatched when an electrical line has gone down. Even though most linemen assume the line is live when they reach the scene to repair a broken connection, its still important to think about their safety. That is why most grid tie inverters on the market have an “anti-islanding” function built into the inverter’s software. The term “anti-islanding” refers to a feature of a grid tie inverter that senses when there is an power outage and shuts itself down and stops the production of electricity. There is a common misconception within solar panel and wind turbine consumers that if there was a blackout their grid tied system would keep them going through an outage, well this is not true because of grid tie inverter anti-islanding feature will stop the production of electricity when the gird goes down. You have to realize that when you own a grid tie system, the energy is stored in the grid, so the system is as reliable as the grid itself. When the grid goes down, the anti-islanding feature on the grid tie inverter will realize that either there was a sudden change in system frequency, voltage, rate change of frequency, increase in kW beyond normal levels, or a change in kVAR and shut down the inverter. When the inverter shuts down your system is no longer producing electricity for the safety of the people who will be working on the grid to repair it. There are grid tie inverters that are still under development such as the TerraWatt Power inverter which works during an outage because the inverter redirect the power being generated by a system back into the property without shutting down and keeps the linemen safe because the TerraWatt Power inverter does not send electricity into the grid when it senses there is an...

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Temperature matters when working with inverters.

Do all Inverters perform equally in different temperature conditions? Well no, all inverters do not perform equally depending on the temperatures. The acceptable ambient temperature for each inverter model is determined by UL (Underwriter Labs) during testing. Each Inverter has a range of temperatures in which it performs optimally. If the temperature is below the ambient rating of an inverter, it can perform erratically or prevent start up of the inverter itself. Extremely cold temperatures can freeze capacitors and affect semiconductor stability. Temperatures higher then the range rated by UL can cause heat stress on the inverter and cause premature failure. Operating Inverters outside the rated temperature ratings could void the warranty, most inverters capture the temperature data and if you install an inverter in an environment that experiences extremely cold or hot temperatures the manufacturer will know the reason for the failure and the damage will not covered under the warranty. So if you are unsure if the Inverter will work in your local area, read the specifications sheet before purchasing your inverter and make sure the Inverter will operate in your...

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The world’s most efficent central inverter

SMA, according to a press release featured on renewableneergyworld.com has released information on their 250U central inverter for commercial scale projects. SMA is a leading inverter manufacturer, if you don’t know what an inverter does, it converts the DC electricity put out by solar panels into AC electricity which is what all our appliaces use. An inverter is a very important component of the overall system design, therefore a consumer must look into the efficency rate of the inverter when shopping for solar power. There are electric losses when DC electricity is converted to AC, therefore the higher the efficency on the inverter, the fast payback a customer will recieve on the system. The SMA 250U commerical inverter is the leading the industry in terms of efficency, which is CEC (california energy comission) rated at 97%! This inverter is UL listed and has an array of features that fit commerical solar power...

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