>>2124328Ah (amp hours) are the critical element with any battery power pack regardless of the tech used and I admitted that the Lifepo4 has 101Ah for 40lbs, which is better then the Xantrex with 55Ah for 60lbs but then the Lifepo4 is twice the price at $1000.
For that kinda money, you could get the Xantrex AND a Ryobi 1000w generator.