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I got my cheap 600Watts Ebay Power jack GTI, it is 28V-55V input/output 110V 60HZ version not 220V 50HZ, inexpensive and very basic model.
It comes with user manual, very low quality and teach me how to repair it.
I tested it with batteries with 1/2 power point 300Watts, Its efficiency is about 83% and it is quite close to User manual rated 85%(seller post 90%, lie), Its sine waves output is slightly not very clean and it sync with 60HZ very well, I can not do farther testing because my setup is not ready.
It is not hard to Sync between 50Hz to 60HZ but slightly increase waveform distortion and slightly lower efficiency, As long as your 220V 60HZ work,, However, it does voltage cutout below 25 Volts and above 60Volts.
Biggest problem for Ebay's Power jack GTI is not that it is only lower efficiency, It burned out easy which end up cost more money.
I think that I make a mistake, I did farther research, FEEbay's power Jack is cheap and low quality, I paid $139 including shipping, However, I find that it comes from China, In China, If I pay slightly more, EX, $169 including shipping, I can get one much better quality GTI than Power jack with 94% efficiency plus other functions, FEEbay's version of Power jack is almost the lowest quality GTI in China.
$139 GTI from Retailor = $25( Courier) + $25(end Retailer) + $25 ( wholesaleer) + $30 Labour cost + $34 material cost
$169 GTI from Retailor = $25( Courier) + $25(end Retailer) + $25 ( wholesaleer) + $35 labour cost + $59 material cost
I think that it is what you pay and what you get, ThereFore $59 VS $34 = better Quality
I do like Sunny boy Germany GTI, However, It is much heavier ( quality) for shipping and It uses very high input voltage, 200V to 600V, It needs to serial connect many solar panels to start it which is not suitable for small hobbyist who use few solar panels as a small starter project.
It comes with user manual, very low quality and teach me how to repair it.
I tested it with batteries with 1/2 power point 300Watts, Its efficiency is about 83% and it is quite close to User manual rated 85%(seller post 90%, lie), Its sine waves output is slightly not very clean and it sync with 60HZ very well, I can not do farther testing because my setup is not ready.
It is not hard to Sync between 50Hz to 60HZ but slightly increase waveform distortion and slightly lower efficiency, As long as your 220V 60HZ work,, However, it does voltage cutout below 25 Volts and above 60Volts.
Biggest problem for Ebay's Power jack GTI is not that it is only lower efficiency, It burned out easy which end up cost more money.
I think that I make a mistake, I did farther research, FEEbay's power Jack is cheap and low quality, I paid $139 including shipping, However, I find that it comes from China, In China, If I pay slightly more, EX, $169 including shipping, I can get one much better quality GTI than Power jack with 94% efficiency plus other functions, FEEbay's version of Power jack is almost the lowest quality GTI in China.
$139 GTI from Retailor = $25( Courier) + $25(end Retailer) + $25 ( wholesaleer) + $30 Labour cost + $34 material cost
$169 GTI from Retailor = $25( Courier) + $25(end Retailer) + $25 ( wholesaleer) + $35 labour cost + $59 material cost
I think that it is what you pay and what you get, ThereFore $59 VS $34 = better Quality
I do like Sunny boy Germany GTI, However, It is much heavier ( quality) for shipping and It uses very high input voltage, 200V to 600V, It needs to serial connect many solar panels to start it which is not suitable for small hobbyist who use few solar panels as a small starter project.
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