I've owned the older 72,000 for s few years as a cpap backup power supply, and it has worked great! Even at over a year between power outages, it remained fully charged. I only need to recharge after use for my cpap and phone charging. It was a no brainer to buy another even better one with cpap cord and a 120watt solar panel for ultimate prolonged outage event. It was delivered at 50% charge, and was fully charged in less than 2 hours with the new 120W panel. Bonus is the new solar panel works with both of them. I am now 81 years old, and in my younger years, I always used Renogy electronic products for my Travel Trailer. I was never disappointed!