--- title: "Low Power Mode" canonical: "https://farmconnect.docs.rubiconwater.com/space/FER/2054586375/Low%20Power%20Mode" format: markdown --- > Macro (toc) # Purpose Low Power Mode** **functionality was originally intended to be used when connecting a FerIT EP Node to a 3rd party device capable of supplying the FerIT with power. With v1.17.0 FerIT firmware onwards, this functionality was extended to FerIT Solar Nodes. The purpose of this mode is to enable functionality in which the FerIT can lower its power consumption to prevent system failure of the supply device. When a FerIT has Low Power Mode functionality enabled and meets low battery Low Power Mode entry conditions, the device enters Low Power Mode. This mode suspends non-critical driver tasks, as well as disables High Power Output mode, to reduce FerIT power consumption, lowering the load and allowing the interfacing device time to charge its battery. Low Power Mode is exited when battery voltage meets Low Power Mode recovery conditions or the FerIT is restarted. Outside of Low Power Mode, the device functions as normal. > ℹ️ **Note** > ℹ️ > ℹ️ Toggling hibernation mode or Low Power Mode setting in DeviceConnect while Low Power Mode is enabled does not disable Low Power Mode, as the Low Power Mode setting is saved in memory and active only after FerIT soft reset. # Setup The functionality is typically configured via DeviceConnect. > ℹ️ **Note** > ℹ️ > ℹ️ Low power mode functionality is enabled by default and the settings required will need to be tuned dependent on the type of product interfaced and system voltage levels. See [https://rubiconwater.atlassian.net/wiki/spaces/FER/pages/2054586375/Low+Power+Mode#Recommended-Configuration-values](https://rubiconwater.atlassian.net/wiki/spaces/FER/pages/2054586375/Low+Power+Mode#Recommended-Configuration-values). > ℹ️ **Caution** > ℹ️ > ℹ️ This functionality requires FerIT Firmware version 1.11.0 or later. Once Paired and connected to the FerIT via DeviceConnect, Navigate to the App Driver (slot 0) section there is a tab related to power modes, it will present you with the following options: | **Setting** | **Acceptable Input Range** | **Default ** | **Description** | | --- | --- | --- | --- | | **Functionality Enabled** | Yes / No | Yes | Set Yes/No to enable/disable the use of low power mode | | **Enter Voltage** | 0 - 65535 | 11500mV | The value below which voltage must drop for the **Detection Period** before a FerIT will trigger a low power suspend state. | | **Exit Voltage** | 0 - 65535 | 12000mV | The value in which voltage must exceed to recover after the** Recharge Period **has expired, After which the FerIT will resume normal operation and exit low power mode. | | **Detection Period** | 300s - 3600s | 600s (10 minutes) | A hysteresis setting to prevent a single voltage spike triggering low power suspends/resumes. This value is used to ensure low power functionality is consistent when System voltage drops below Enter voltage or rises above Exit voltage. | | **Recharge Period** | 600s - 86400s | 86400s (24 hours) | The minimum suspend duration the FerIT will enforce for the connected device to recharge its supply, During this time, **Exit Voltage** is ignored to ensure adequate charging, Once the period has expired on the next voltage detection greater than **Exit Voltage** the device will resume normal functionality | > ℹ️ **Caution** > ℹ️ > ℹ️ The FerIT requires an input within the acceptable range and an Exit voltage that is greater than, or equal to, the Enter Voltage by 200mV, A failure do apply these settings will revert all settings back to their default values. Like any settings change on a FerIT via DeviceConnect, the FerIT needs to be soft rebooted via the UI to save the settings to memory. Once rebooting the device these settings will be active. A visual representation of these settings and their expected functionality can be seen below (assume the Detection Period is set to 20 minutes). ![image](media://85f88ee7-4e90-445a-a3dc-8080246fe25b) # Example Assume a FerIT is connected to a MACE FS2 Flow meter powered via a 6V battery. The settings have been configured to the following: **Enter Voltage** - 5800 mV **Exit Voltage** - 6000 mV **Detection Period** - 600s (10 minutes) **Recharge Voltage** - 86400s (24 hours) Once the voltage level drops below 5800mV consistently for a 10-minute duration, The FerIT will trigger a self-power down to internally to reach the lowest current drain possible. When the self-power down mechanism is triggered, the FerIT will keep in a low power state for the minimum duration of 24 hours to allow allow the MACE FS2 to recharge its internal battery. When the FerIT detects the voltage has recovered above 6000mV for the same transition 10 minute duration, FerIT will power up and resume flow meter interfacing functionality. If the voltage has not recovered sufficiently, the state will continue until the 10 minute timer is satisfied. # Diagnostics DeviceConnect can be used to track the status of Low power mode and its current state. In the FerIT App Driver under the Data Section. The App Flags can be polled and expanded. Here you can see the FerIT is **Powered External, **That all the drivers are active as **Device Drivers Suspended **is off, and that we are not in a **Low Power Suspend** state. # Recommended Configuration values Configuration values **must** be checked during setup for each FerIT device and battery configuration, as they are dependent battery voltage and discharge behaviour. Below are the recommended settings for several common batteries, for any other batteries contact Rubicon Engineering for assistance. | **Setting** | **Default ** | **DryPower SLA 12V**
77031 SD (12SB7.2P-F2)
82965 SD (12SDB9P-F2) | **Rubicon Lithium 12V**
76814 SD (12V10Ah LiFePO4) | **K2 Lithium 12V**
81319 SD (K2B12V11EB) | **Panasonic SLA 12V**
EOL (UP-RW-1245) | | --- | --- | --- | --- | --- | --- | | **Functionality Enabled** | Yes | | | | | | **Enter Voltage** | 11500mV | Same as Default | Same as Default | Same as Default | Same as Default | | **Exit Voltage** | 12000mV | Same as Default | Same as Default | Same as Default | Same as Default | | **Detection Period** | 600s
(10 mins) | Same as Default | Same as Default | Same as Default | Same as Default | | **Recharge Period** | 86400s
(24 hours) | Same as Default | Same as Default | Same as Default | Same as Default |