And when cycling for long periods of time below 11-13kph, you’ll need to look to other charging solutions (solar or power banks are usually best for off-road bikepacking). If you’re cycling at lower speeds for short periods of time, a buffer battery will need to be incorporated into your charging system to help meet the power needs of your device. While some USB chargers will start charging at lower rates of power, most devices like to charge above 2-watts (5V x 0.4A) to ensure the charging level is stable.Ģ-watts can be reached by the best dynamo USB chargers at speeds between 11-13kph. Once the power is converted to DC it’s more like 5V and 0.5A, which is the power required for USB charging. The equation is, therefore:Ī 3-watt dynamo hub will put out 6 volts at 0.5 amps (3W = 6V x 0.5A) in AC power. Watts (W) is the total electrical system power, equal to the voltage (V) multiplied by the current (A).
It’s the same with electrical systems increasing the voltage increases the current. By increasing the water pressure in a pipe, you will increase the flow rate too. Voltage is the water pressure and current is the flow rate. A common analogy for these units of measurement is in terms of a water pipe. Today we’ll be discussing voltage (in volts or ‘V’) and current (in amps, or ‘A’). It’ll take a moment to get your head around this, but the knowledge will help, promise! Watts, Volts and Ampsįirstly, let’s quickly cover a few basic electricity units of measurement.
The Cinq Plug5 Plus charger on my KOGA WorldTraveller-S. This article was originally written September 2017 but has been re-written in July 2019 with the latest information. A big focus will be the power output of different chargers at different speeds, but we’ll also look at dynamo hub drag, charger efficiency, form factor and how quickly you can expect your batteries to charge. This is a pretty technical resource, so strap yourselves in and take it slow. The result is powerful USB chargers that offer high levels of efficiency, that can be neatly fitted to any bike. often just one person) are designing both hardware and software that exploits the very modest power offered by a dynamo hub. There is a wide array of dynamo USB chargers available ( 24 of ’em, in fact), and while most do an adequate job of keeping your electronics charged at high speeds, there is only a select few which can provide a decent charge at ‘touring’ speeds.ĭynamo USB charger technology is actually improving at an incredibly fast rate.
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