My 40a DC/DC charger failed on my GoFurther battery box after 18 months or so. Until then it had been a great little unit, but after using the solar input a few times it cooked something, I was never told what.Anyway, after about 6 months of back and forth troubleshooting it turns out the warranty on these is only 12 months anyway.They did assist in upgrading me to the premium box for a heavily discounted price, cool, but I believe that the quality is poor. I've seen other brands dcdc charger last year's when exposed to the elements in heavy mining environments, whereas my one lived quite safe and secure in a canopyIt did it's job, but you really do get what you pay for
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