If a truly large run time is needed, a larger unit like the ones Jackery makes for campers is a good choice

Although an expensive one...

Jackery Explorer 300 = $1.02 per watthour

Jackery Explorer 1000 = $1.097 per watthour

Chinns LiFePO4 with ChargeIt! USB-C PD supply and $120 AC charger = $0.36 per watthour.

If you want a solar controller also, add $22.. brings it to $0.384 per watthour.

Add a 1000 watt inverter and you are still under 50 cents per watthour - half the price of a similar Jackery.

Sure if you want an off-the-shelf, ready-to-go unit and have the money, Jackery is OK. Buy the parts separate and you can save a good bit of money.