Battery Charger; Auxiliary Voltage Outputs; Pwr Led Status - Sferalabs Iono Pi Max v2 3+ Lite User Manual

Battery charger

The Iono Pi Max UPS (uninterruptible power supply) implements a programmable battery
charger, that can charge an external lead-acid battery (other chemistries could be
supported with future firmware releases).
The battery line is protected by an internal 3.3 A resettable fuse.
You can use either 12 V or 24 V batteries. The supported maximum battery capacity is 60
Ah, but the battery charger can deliver no more than approximately 600 mA charging
current, so charging time for large batteries could be very long.
For low load applications, a 12 V 1.2 Ah battery is sufficient to keep Iono Pi Max running
for several minutes and perform an orderly shutdown. A 12 V or 24 V 7 Ah battery is
recommended for high load applications.
The factory default configuration for the battery charger has the charger enabled and
configured for a 12 V lead-acid battery with 800mAh capacity.
WARNING
Ensure that the charger parameters are correctly configured before connecting the battery
to the battery terminals.

Auxiliary voltage outputs

Iono Pi Max has an auxiliary regulated voltage output, labeled VSO on the terminal block,
that can be set in a 12 Vdc to 24 Vdc voltage range, and is powered by the UPS. It can
deliver up to 8 W, and its output is protected by a 1.1 A resettable fuse.
Iono Pi Max also has an auxiliary 5 Vdc voltage output pin on the terminal block, labeled
5VO, to supply power to external 5 V loads, like 1-Wire devices. The current output limit is
500 mA. An internal protection circuit shuts down the 5VO line if the current limit is
exceeded.
In the factory default configuration, both the 5VO and VSO outputs are enabled, with VSO
set for 12 V output voltage.

PWR LED status

During normal operation, the PWR LED is stable green or stable blue (base color) to
indicate that the Raspberry Pi is using respectively SDA or SDB as boot SD card.
During power off time in a power cycle, the LED is stable red.
When the shutdown delay is running, a red blink is alternated with the base color.
When the watchdog timeout expires, a yellow blink is alternated with the base color.
When the module is running on battery power, the base color blinks on/off.
When system status warnings are active, a white blink is alternated with the base color.
In concurrent situations, priorities are given in the above order.
21 Iono Pi Max User Guide