User's Manual

Battery fuel gauge. PowerMon is a battery monitor so it can keep track of a battery state of charge. This

is accomplished by using coulomb counting. Charging current is displayed as a positive value while discharging

current as a negative value. Due to the complex nature of chemical batteries, small errors in measurement and

integrating current over long periods of time will introduce errors in the state-of-charge estimation. This is

normal and expected. For this reason, the device will re-synchronize its SOC counter with the battery every time

a full charge is performed. A full charge is detected based on the chemistry of the battery but in general it

requires a voltage higher than a threshold while at the same time the charging current being lower than a

threshold. The battery fuel gauge will also take into consideration the Peukert effect. The next table shows the

Peukert coefficients used for various battery chemistries.

Battery Chemistry

Peukert Coefficient

Lead Acid - Flooded

1.25

Lead Acid – AGM

1.15

LiFePO

1.02

Li-Ion/LiPoly

1.02

Time keeping. PowerMon keeps track of time internally. The internal clock can be set by tapping on

the Device Time tab for longer than one second. The internal date and time will be updated using the system

time provided by the mobile app. PowerMon will only log data when the internal clock is set.

Timer function. The device supports controlling the relay using a set of up to 16 timers. Each timer

contains a start time, stop time and repetition. The start time specifies the time of day (HH:MM) when the relay

turns on. Stop time specifies the time of day when the relay turns off. A timer does not need to have both a

start and stop time set. One of them can be disabled. This kind of timers should be used in pairs: one turns the

power on and the second one turns it off. ‘Repetition’ controls the days when a timer will trigger. This can be

either DOW (Day of Week) where the timer repeats on specific days of the week or DOM (Day of Month) where

the timer repeats on a specific day of the month (multiple days of the month when using the PowerMon X app).

Using multiple timers, users can create very complex time schedules.

Examples:

Timer1: START 4:50PM, STOP 5:10PM, REPETITION DOW Sun Mon Tue Wed Thr Fri Sat

This timer will run every day and turn the relay on for 20 minutes, from 4:50PM until 5:10PM

Timer2: START 8:00PM. STOP: disabled, REPETITION DOW Sun Mon Tue Wed Thr Fri Sat

Timer3: START disabled, STOP: 7:00AM, REPETITION DOW Sun Mon Tue Wed Thr Fri Sat

This set of timers used together will turn the relay on every day at 8:00PM and turn it off the following

day at 7:00AM.

Timer4: START 12:00AM. STOP: disabled, REPETITION DOM: 1