Work Done
Kilo-Watt-Hours is a measurement of energy consumption familiar to
anyone paying an electric bill. Prior issues of Power News have
noted that Watt-Hours is a better measurement of a batteries capacity
than Amp-hours, since Amp-hours at a higher voltage do more work
than Amp-hours at low voltages typical of thick plate deep cycle
batteries. Kilo-Watt-Hours, KWH, is a measurement of actual
work done by the expended energy, since it is a product of Volts
and Amps.
It is useful to know the KWH delivered during the present, (and last) discharge, as well as the total KWH delivered by the batteries. The 1995 EMON II does both!
KWH
The EMON II continuously computes the KWH of a discharge
and provides a display of the maximum KWH consumed during the discharge.
The maximum KWH consumed valued is retained during a
subsequent charge cycle since there is no possible method to rewind
the value
during charge. (KWH of recharge doesn't correlate to KWH of discharge.
Charge delivered is only related to current, not current and voltage.)
KWH Total
The EMON II keeps a total of KWH consumed from the battery bank. This
running total is maintained in non-volatile memory and is retained
during power failures. Total KWH produced by a battery bank is useful
comparison data between battery brands.
The KWH accumulator can be reset under the RESET? menu.