Project Parameters Rated Power 1000/2000/3000/4000/5000/6000W Surge Power 3000/6000/9000/12000/15000/18000W Input Voltage 12V/24V/48V Output Voltage Range &plusmn;10% Overcharge Protection 13.5V(10V), 33V(20V), 66(40V) Frequency 45/65Hz Output Waveform Pure Sine Wave Soft Start Yes THD / AC regulation THD<3% Output Efficiency >88% Recharging Current Low, middle ,high, supper high(10-90A) Working Temperature 0C&deg;~40C&deg; Warranty 2 Years Q:Are you a factory? A:Yes,we are a factory which has been focusing on research and development and manufacturing all kinds of socket for 10 years. Q:What if there is some problems with your products after I receive the bulk? A:The rate of our qualified products is 99%-100%.If some products are not working when you receive them,we will supply you the same quantity qualified products. Q:What is the material of your products? A: The shell material is ABS, PC, PA66, V0 Flame-retardant level. Hardware is 0.7 mm thick of beryllium bronze. Our company uses relay with high quality which is bought from Sky-Wave and Loose Joy. All chips are imported from Taiwan and United States. Q:How can I get some samples? A:All the sample is available in stock, we can send you free sample if you can pay the express fee. Q:How does your factory do regarding quality control? A:We have professional QC department, we inspect all steps from the purchase of the materials to the departures of products from our factory according to the standard test. We always attach great importance on quality control from the beginning to the end . Our factory has gained CE.FCC.Rohs ceritificate. Q:When you ship my order? A:Normally 30to45days after receiving your payment,but it can be negotiated based on production schedule. Q: How long is the product warrenty period? A:Every products has the patent of the original, we promise that the products have two year warrenty, but the counterfeit products are not included in the warrenty period Q: How to identify the quality goods is BXST? A:We all have anti-counterfeiting qr code on each PCB circuit boards If you want to know more, please contact us, we will get back to you as soon as possible!