Xylem CHATTER Hardware Manual - Manual (Page 39)

Appendix B. Calculation of Battery Lifetime
The battery in the MJK Chatter unit is of the lithium-trionyl-ion-trotyl type
which is characterized by a high energy density, a low self-discharge, and
a long lifetime. The energy density is 17 Ah nominal and guarantied 15 Ah
(15.000 mAh). Depending on the use of the Chatter unit you can estimate the
battery lifetime.
The Chatter
will, depending on the setup, execute one control call every 25th.
hour (if a shorter interval has not been selected). This ensures that you can
always make changes to the setup efter 25 hours. MJK recommends that
you perform a call every 24 hours (once a day) or more frequent.
The lifetime calculation is simple for usages with a fixed log interval, whereas
usages with event log require a time estimation for the event logs.
Calculation Template
Chatter basic consumption per day (fixed) = 1.0
No. of logs per day @sensor consump.=2mA ? x 0.1 = -
No. of logs per day @sensor consump. =4mA ? x 0.2 = -
No. of event logs per day @sensor consump.=2mA ? x 0.1 = -
No. of event logs per day @sensor consump. =4mA ? x 0.2 = -
No. of calls per day ? x 3 = -
No. of alarm calls per day ? x 3 = -
Consumption per day (total): -
Battery lifetime in days: 15000/consump. per day [day] = -
Battery lifetime in months: Battery lifetime [days]/30 [months] = -
Battery lifetime in years: Battery lifetime [months]/12 [years] = -
=====
Appendix B. Calculation of Battery Lifetime
Data Logger
39