Samlex inverters

I realize this post is almost nine years after the question but I hope that my experience might save somebody the frustration I have suffered.  For those who are unaware, Samlex inverters are no longer manufactured in North America and apparently it has affected the quality.  I bought a 2000 watt SSW series pure sine wave inverter in late March, 2018 from Amazon.  In the box was a used 1,000 watt inverter.  I don't know how this happened but I didn't blame Samlex because it probably happened at an Amazon warehouse.  Amazon replaced it without any issue.  Unit #2 initially worked, however the fan was not temperature controlled as explained in specifications or the manual that came with the unit. The fan ran 24/7 regardless of load.  I called Samlex and the tech explained that is how the unit is supposed to function.   So the unit has to be turned off when not in use so the fans don't cause additional drain on the battery beyond the normal no-load drain.  About a month later, unit #2 died.  Although it was just past the Amazon 30 day return window, they made an exception and allowed the return due to problems I had with unit #1.  Unit #3 worked for five months and then it failed.  I had to return it to Samlex at my expense for a warranty replacement.  The manual in unit #4 had been updated to reflect that the fan does run 24/7.  Unfortunately, unit #4 was defective straight out of the box.  The circuit that detects low battery status properly detects that the battery is fine, however it sounds the low battery alarm anyway, regardless of battery charge condition or whether there is a load on the inverter.  The tech told me there is no way to shut the alarm off, so I can either go insane listening to the alarm or send the unit back in (at my expense) to receive replacement unit #5.  I have cheap "throwaway" MSW inverters that have lasted me for years.  When searching for a PSW unit I bought Samlex because they have a reputation for quality.  However, it's actually the worst brand of inverter I have experience with, and definitely not worth the higher price.