Per kWh of cycle life, suitable to be compared with utility rates.
$280/kWh / 6000 cycles = $0.047/kWh of cycle life.
$100/kWh / 6000 cycles = $0.017/kWh
Recently we've been seeing 6000 cycle claims. Previously I thought it was in he 3xxx cycle range.
A cycle life test of batteries several years ago saw maybe 5% of brands keep operating long enough to be fully tested. Some were repaired, many testing stopped. A couple delivered claimed life and capacity. Very few were LiFePO4; it was mostly earlier generation of batteries.
Based on those results I was saying to look for break even by 25% of claimed cycle life, can't count on 100% and don't want to lose money if pack fails.
There will be a spread between units regarding actual life delivered, and now that interest rates are no longer zero we have to consider time value of money.
$0.05/kWh of power used is attractive for those of us with inflated rates ($0.50/kWh), not attractive if cheap rates $0.10/kWh.
All that compared to utility rates. Backup and offgrid, value isn't just dollars.