Xylem MJK Chatter Hardware Installation User Manual page 39

Appendix B. Calculation of Battery Lifetime
ThebatteryintheMJKChatterunitisofthelithium-trionyl-ion-trotyltype
whichischaracterizedbyahighenergydensity,alowself-discharge,and
alonglifetime .Theenergydensityis17Ahnominalandguarantied15Ah
(15 .000mAh) .DependingontheuseoftheChatterunityoucanestimatethe
batterylifetime .
TheChatter will,dependingonthesetup,executeonecontrolcallevery25th .

hour(ifashorterintervalhasnotbeenselected) .Thisensuresthatyoucan
alwaysmakechangestothesetupefter25hours .MJKrecommendsthat
youperformacallevery24hours(onceaday)ormorefrequent .
Thelifetimecalculationissimpleforusageswithafixedloginterval,whereas
usageswitheventlogrequireatimeestimationfortheeventlogs .
Calculation Template
Chatterbasicconsumptionperday(fixed)=
No .oflogsperday@sensorconsump .=2mA
No .oflogsperday@sensorconsump .=4mA
No .ofeventlogsperday@sensorconsump .=2mA?
No .ofeventlogsperday@sensorconsump .=4mA  ?
No .ofcallsperday
No .ofalarmcallsperday
Consumptionperday(total): 
Batterylifetimeindays:
Batterylifetimeinmonths:
Battery lifetime in years:
=====
AppendixB .CalculationofBatteryLifetime
Data Logger
 

15000/consump .perday[day]= 
Batterylifetime[days]/30[months]=
Batterylifetime[months]/12[years]=

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  1 .0
x 0 .1= -
x 0 .2= -
x 0 .1= -
x 0 .2= -
x 3= -
x 3= -
  -
-
-
-