This is exactly the same thing you would buy if you got a Harbour Freight unit. They are manufactured at the same place. This unit is NOT marine grade, there is no epoxy coating on the board. Obviously with a fan it's not water tight either.It's cheap plastic, no hiding that.
It can take a load and it performs well. You can water resist any inverter, just take off the plastic case and spray clear coat on the board. Then heat it to 200* for 2hrs to cure it (just run an inverter with a load for two hours).
EVERY modified sine wave inverter is most efficient when it's running HALF it's rated Nominal load. It's just the way the circuit and transistors work. This unit is 71% at half and less than 65 at full. That's GARBAGE! Cobra units are over 80% on both and Pure Sine are over 90% on both.
It's overpriced for what it is. Don't bother. I really was expecting something much better. I'm giving it three stars because the board, solder and parts used are good quality but it's a dated design that's not efficient. 10amps in gives you .5amps out (DC to AC) or in another way 120 watts consumed in DC power gives you 60 watts out. You loose half the power. It also falls really short in capacitance capabilities or in english starting an electric motor from a stop (press the trigger on a drill that's startup draw or Capacitance). The PEAK is usually where that rating comes in but a 1/2" hammer drill from Milwaukee blew out the safety shutdown every time and it's rated for 500w.
SOLAR users: Buy a more efficient model. You don't need to spring for Pure Sine unless you intend to run sensitive electronics (computernot laptop, LCD TV, cable box, anything with a radio in it, etc...).
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