SAVE 43% (AND GET A FREEBIE): As of Oct. 20, the EF EcoFlow Delta Pro 3 is on sale for $3,599, down from $6,298, at Amazon. That's a 43% discount and a $2,699 price cut. On top of that, because the purchase is over $2,000, it qualifies for a free gift from EcoFlow — in this case, a free portable solar panel to get you started with off-grid charging.

Having a small portable power station is great for camping or keeping your phone charged during a quick outage, but if you're in a multi-day blackout situation or need to power a larger appliance, those smaller options probably won't cut it. If you need real backup power but hate the idea of a noisy, smelly gas generator, then these massive battery systems are what you should be looking at.

As of Oct. 20, the EF EcoFlow Delta Pro 3 i

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