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STI series is a sine wave power frequency inverter which can convert 12V or 24V DC to 220VAC or 230VAC 50Hz based on full digital and intelligent design. The inverter can be applied in many fields especially for solar photovoltaic power system.
·Complete isolation-type inverter technology, noiseless output
·Adoption of advanced SPWM technology, pure sine wave output
·Dynamic current loop control technology to ensure inverter reliable operation.
·Wide DC input voltage range
·Excellent EMC design
·Low output harmonic distortion（THD≤3%）
·LED indicators display input voltage range, load power range, normal output & failure state
·Optional energy saving mode
·Wide working temperature range (industrial level)
·Continuous operation at full power
·Output Short Circuit protection
·Input reverse polarity protection
·Input low voltage protection
·Input over voltage protection
·Inverter abnormal protection
Nominal Battery Voltage
Input Voltage Range
No Load Current
Pure Sine Wave
220Vac±3% / 230Vac±10%
Power 10 sec
Power 1.5 sec
≤ 3% (resistive load)
Efficiency at Rated Power
< 95% (N.C.)
< 5000m(Derating to operate according to IEC62040 at a height exceeding 1000m)
Between DC input terminals and metal case: ≥550MΩ;
Between AC output terminals and metal case: ≥550MΩ.
The differences between both panels are related to the system where they are going to be installed.
On-grid installations, as the name said, are thought to feed the produced energy into the grid and for that it is important to have the biggest voltage that it is allowed (1000VDC in Europe, 600 VDC in USA). For a defined power, more voltage means less current (P=V*I) and less losses.
In off-grid installations it is different because you must storage the energy into batteries. Batteries usually work at 12, 24 or 48 VDC and off-grid photovoltaic modules work at the maximum power point (mpp) near this voltage (see the datasheets). So the controller that charges the batteries works also near the batteries voltage.
Your limiting factor here is going to be this controller. You have to see what is the maximum voltage and the maximum current that it can work with, upstream (photovoltaic modules) and downstream (batteries andinverter). Then you have to dimension your PV array (Voltage and Current).
SMA did bump up the warranty to 10 years when CSI demanded all inverter manufacturers to do so. The European Sunny Boys are only warrantied for 5 years.
iPhones only have a one year warranty. Does that mean Apple products aren't reliable? Enphase offers a 25 year warranty on theiribut only one year on their inverters monitoring. Does this mean their monitoring is not as reliable as their inverter? Of course not.
Offering long warranties have very real costs, especially for publicly traded companies like SMA. If we were to offer a 25 year warranty, we would have to hold a higher reserve on our balance sheet, making our products more expensive. We think that our customers would rather have our high quality products at a lower cost.
Start-ups invariably offer long warranties to make up for lack of track record or the perception of quality problems. As the unfortunate recent events at Solyndra have shown, long warranties offered by start-ups can have limited practical value.
Analogies can be drawn to the wind industry: in the early days, customers requested very long warranties (20 years or so), since it was the wild west and no one had a clue about long term O&M requirements for these big new turbines. Now that the wind industry has matured, turbine warranties are again very short (2 years is typical) since the large suppliers have a track record of shipping quality product that does not fail when properly maintained. You could say that PV today is like the wild west environment in wind 10 years ago.
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