This battery box ventilator replaced my original which was same manufacture, make and model. The original lasted for maybe 18 months, I am hoping to get more longevity out of this one. The new ventilator came with a inline fuse, which the original did not. It is quit possiable the solar contractor failed to install the inline fuse with the original ventilator. It is very difficult to find quality contractors of ANY kind these days. If you can, just do it yourself.
received item broken, appeared to be from manufacturing. Shipping box was in good condition internal shaft in fan unit was not attached to the motor. Solar Panel Store was very responsive and shipped me out a new one.