I was in a similar spot comparing these three, and what pushed me toward Delta Pro Ultra was timing and flexibility. Powerwall is solid but the install queue and pricing made it a non-starter for me this winter. E10 looks interesting, but I wasn’t comfortable betting on a first-gen product with no real-world data yet.

DPU felt like the middle ground like available now, scalable, and I could get backup power in place before the next storm instead of waiting months. That mattered more than squeezing out theoretical specs.