Bests & Worsts Reviews from Amazon

I bought this Renogy inverter specifically to work with my ebike battery charger for off grid ebiking. The inverter is connected to my truck camper battery. Right from day one, the AC output voltage from the inverter surged causing the battery charger to surge (not work properly). The ebike battery charger works perfectly well on AC household current. I have been communicating with Renogy 'Customer Service' for 4 weeks now. I started out with Amazon customer service and because I didn't install the inverter and find this fault on the new inverter within their 30 day "return window" I was out of luck with them, no exceptions! It has been an ongoing battle to get this inverter sent back to Renogy for repair/replacement. Some 'Customer Service' Amazon and Renogy! Not a great way to get return customers in the retail business.