DYNABANK is ideal for providing energy during bikepacking. It is a power bank that is optimized for charging from an alternator in a hub. Like DYNAUSB, it uses a high-efficiency rectifier with MOSFET transistors for maximum efficiency, but everything else is different. The integrated Li-Ion battery with a capacity of 10,000 mAh is charged during the ride. The advantage over direct charging of a mobile phone is the use of the maximum available power for charging at any speed. Charging starts at about 5 kmph and increases with higher speed. Charging is controlled by an analog circuit, which only works as a limiter for charging voltage (max 4.2V) and controlling maximum current to battery. With a higher load of the alternator (ie higher current consumption) the voltage on it decreases. This principle is used to set the charging current as such that the voltage behind the rectifier reaches the battery voltage, so the system is in balance between the minimally available alternator power (due to speed) and charging current.
The voltage from the battery (which has a nominal voltage of 3.6V) is converted by the DC/DC converter to 5V for two USB outputs. Each output has a separate converter with a maximum output current of 2A. To minimize accidental battery discharge, the inverters are turned on when the button is pressed. And each output alone. If the current drawn on one of the ports is zero or falls below 50 mA, the respective converter is switched off in 10 seconds. Therefore, if you charge your mobile phone or navigation, the converter is switched off when charging is complete. This saves a lot of battery power. You can also enable output while driving, but in this case the battery is typically not charged, but the energy obtained is directly converted to 5V for charging via USB.
The battery can also be charged from a classic mobile phone charger via a USB-micro connector. Therefore, if the required consumption is higher than it is able to provide charging from the alternator, it is possible to support charging from a conventional socket. The same charging circuit is used for charging, the maximum current is limited to 1.2A, that is 6W of power. The battery charging time is approx. 10 hours (from a fully discharged battery).
DYNABANK is not waterproof, so it is advisable to place it in a waterproof bag, where it is protected not only against water, but also against mechanical damage in the event of an accident. The bag for mobile phones or navigation with a transparent cover is ideal, in the lower part of which DYNABANK can be placed. To increase water resistance (during prolonged rain), it can be placed in a plastic bag.
There are three LEDs available to indicate the status of device:
- green - indicates the input voltage after rectification
- yellow - indicates the charging current while driving
- red - indicates that the 5V inverter is turned on and the output current
|Battery capacity||10 000 mAh|
|Battery voltage||3.6 V|
|Maximum input voltage||48 V|
|Maximum voltage on USB-Micro||6 V|
|Maximum charge current||1.2 A|
|Number of USB outputs||2|
|Output voltage||5 V|
|Maximum output current||2 A|
|Dimensions||124 x 84 x 30 mm|