That's some good diligence!
It looks like the ecoflow values are lower:
https://www.inchcalculator.com/convert/kilowatt-to-btu-per-hour/
Since one kilowatt is equal to 3,412.14245 btu per hour
30 KWh/day x 365 days x 3,412 Btu/KWh = 37,361,400 Btu
Which is half the value I found for 2015. Does ecoflow have more current data and houses are twice as efficient? Maybe. They're also trying to sell something, so maybe it's based on data from their products. They don't mention where they got it from.
The welovecycling conversion is off by 1000 (maybe the kilocalorie threw them off?)
https://www.inchcalculator.com/convert/joule-to-kilocalorie/
Since one kilocalorie is equal to 4,184 joules
1 kcal = 4,184 J so 1 J = 1/4,184 kcal = 0.00023900573613 kcal
Otherwise, your math was right, just off by 3 zeros, so a household is more like 3.6 bagels per hour.
The nist site also doesn't specify a unit of time, but if it is 20 watts/hour (Wh) we'd only need to move it 3 places for KWh, or 0.020 KWh.
Too many conversions can introduce errors, so we can go from KWh to kcal directly:
https://www.inchcalculator.com/convert/kilowatt-to-kilocalorie-per-hour/
Since one kilowatt is equal to 860.420815 kilocalories per hour
0.020 KWh x 860 kcalh/KWh = 17.2 kcalh
Which, yeah, is not much of a bagel per hour. Keep in mind that the daily recommended calories for an average adult is 2000 kcal.
All in all, this was a fun thought experiment, so thanks for looking into it further!
Yep, my grandmother went through the Great Depression and didn't eat pork unless it was well done. For example, bacon had to be crispy.
Turns out trichinosis can kill children, and not silently in their sleep.
These days, commercial pork is highly regulated and safer to the point you only have to be cautious with smaller ranches.
Unpasteurized milk has a similar story, but my grandmother swore drinking that as a child was why she never had osteoporosis.
Me? It's 2024, most food lacks nutritional value, so I cook everything to temp and take supplements