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I have two of the previous generation - an EcoFlow River Pro (720Wh) and EcoFlow River Max (576Wh). I also have 200W solar panels (different brand: 'Allpower') to re-charge when out in the field - that works pretty well, too. They also double as my emergency power system at home - I ran my fridge for 8 hours off the Max during an outage and it still had some energy to spare.
The 'usable' energy seems to be about 70-80% of the nominal figure, depending on whether you're using DC direct or the AC inverter, and probably driven by the power factor of your equipment.
I'm quite happy with mine. They're enough to drive my mount, cameras, filter wheel, dew heaters and two laptops for a couple of nights, so the Pro 2 should be fine.
They have fairly regular sales, so keep an eye out for those.
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