Can these things handle being on constant or long periods of time ? Or is it strictly for backup power ?

DEPENDS ON USAGE. I TRY TO REDUCE MY CARBON FOOT PRINT AND HENCE USE THESE AS PRIMARY. Things to keep in mind....never use battery to use electric heaters, stoves, induction stoves, hvac or a/c and other high power consuming equipment. Fridges and freezers, washing machines etc which are electro-mechanical devices are fine. Electric HEATING devices deplete batteries faster, so no use. Hydrocarbons (gas) are good for 'producing' heat due to their chemical nature. Using electric/battery operated will be an 'overkill' for such devices. It is easier to heat a room with a simple 'blueflame heater' then an 'electric space heater'.

Is solar pass through too ?

Yes on the Delta 2 and all of EcoFlow products.

Can you leave it plugged in on ac power as in a ups scenario? i would like to use it with a pellet stove.

Yes. I use this feature at least once a day when I cut the feed from house power to the delta so it can be charged from the solar panels in my backyard. When this switch happens, my desktop and 3 monitors never turns off. According to Ecoflow User's Manual, the switch is within 30ms and 1 second = 1000ms.

Can this run a 115vac?

We have a new "Energy Star +" super efficient Midea 8K BTU Window AC we got this year, and I believe the power consumption is 700W. So considering efficiency losses, this unit could run that AC for about an hour and 15 min. Also when the compressor and fans start up in ACs, they tend to draw a huge amount of power. The inverter in this unit is pretty beefy, and would likely be enough to cover the start up of your AC if its a smaller unit, but realistically you'd be out of battery in an hour or less.

Brand	EF ECOFLOW
Wattage	1024 Watt-hours
Fuel Type	Solar
Power Source	Solar Powered
Recommended Uses For Product	Camping
Item Weight	58 Pounds
Voltage	120 Volts
Output Wattage	1800 Watts
Special Feature	Built to last 6x longer, Huge AC output, Control from anywhere, Expandable capacity, 7x Faster AC charging
Included Components	AC charging cable, 220W bifacial foldable solar panel, Solar charging cable, EcoFlow DELTA 2 portable power station, Car charging cable
Color	Black
Product Dimensions	15.7"L x 8.3"W x 11.1"H
Model Name	DELTA 2
Engine Type	Solar
Ignition System Type	Electronic
Runtime	0 minute
Total Power Outlets	15
Frequency	60 Hz
Engine Power Maximum	1800 Watts
Starting Wattage	2700 Watts
Running Wattage	1800 Watts
UPC	842783120823
Manufacturer	DELTA2+220W
Part Number	EFD330
Item Weight	58 pounds
Item model number	EFD330
Style	DELTA 2+220W
Item Package Quantity	1
Special Features	Built to last 6x longer, Huge AC output, Control from anywhere, Expandable capacity, 7x Faster AC charging
Usage	Outdoor Use
Batteries Required?	No
Warranty Description	5 Years Manufacturer

Solar Generator DELTA 2 with 220W Solar Panel, 1024Wh LFP(LiFePO4) Battery, 1800W AC/100W USB-C Output, Fast Charging Portable Power Station for Home Backup Power, Camping & RVs

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