Exactly. That's why I was trying to make the distinction between the different areas that surround the overall efficiency of getting energy into and then back out of batteries. Perhaps the terms charger efficiency, charging efficiency and discharge effficiency would be better for these conversations since charging and discharging efficiencies are both distinct attributes of the batteries themselves.
Thanks for your input.
Eric
--- In electricboats@yahoogroups.com, "hardy71uk" <p0054107@...> wrote:
>
> Zivan and the like are probably just quoting the efficiency of power out to power in of their chargers at their best operating point ( probably in bulk charge). the "charging efficiency " is a characteristic of the battery itself. So even with a magical 100% efficient charger you'd still need about 20-30% more power into a lead acid than you would get out.
>
> Chris S
>
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