GC wrote, On 10/23/2013 2:18 AM:
On 8/10/2013 04:17, son_of_flubber wrote:

The internal "completely discharged" capacity of a Shorai LFX is 1/3
the rated "PBeq" capacity. For example, the LFX18 12V series have 6Ah
cells internally. But the cells are capable of 80% discharge without
damage and while retaining more cranking ability. As such, the USABLE
capacity(or "reserve capacity") of an LFX18 12V battery is on or very
near par with 18AHr-rated lead acid batteries, while providing
superior cranking performance and a vast reduction in weight. The
Shorai PBeq AHr (lead-acid equivalent) rating system therefore allows
users to compare a very different technology from lead-acid, but on a
close apples-to-apples basis when making a choice.

So they say. In the famous words of Miss Mandy Rice-Davies "They would
say that wouldn't they".

BTW - how big is "vast"?

According to Shorai, it's about a 5:1 weight reduction. That's also a
clue to why they aren't good for energy storage: there just isn't enough
material inside the case to store the energy you expect for the
"[equivalent] amp hour rating". A typical Li-Fe battery will weigh about
half of what an SLA weighs for a given amp hour capacity.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)