Comment by m463
2 days ago
sorry, probably should have quoted the entire thing:
> The batteries are showing a round-trip efficiency of 96 percent, a significant 2 to 3 percent better than LFP. (“Round trip” refers to the amount of energy a battery discharges, relative to the amount used to charge it).
I think for cars, the efficiency probably doesn't matter that much. If it costs $1.03 per kwh instead of $1.00 per kwh, or 103 miles vs 100 miles, no car owner will care.
But grid storage is all about efficiency.
> But grid storage is all about efficiency.
Is it? Isn't there usually a very large price ratio between when grid batteries are charged and discharged? Like charging at 5 cents and discharging at 25? In that situation a couple percent of inefficiency is nothing special, just a small cost.