It should be. I’m using it with the Eco Flow River Max. I have only had it a couple of weeks but love it so far and wish I had discovered it earlier. It’s panel number 4 in my prep kit. I combine all 4 with my Bluetti AC200 and they charge it fully in 3 1/2 hours. The AllPowers charges the River in 4 hours. The River only takes one 200 watt panel. I know the Delta takes more but don’t remember the specs. Compared the prices to the name brand 200 watt panels, and the reputation of this, I had to try this first. This is a winner. Just check the specs on the Delta to see how many it would take.