Hex ezCAN for CAN-bus-equipped Motorcycles
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© Hex Innovate (UK) Ltd. Page 8 of 60 ezCAN 2408.x
to a power circuit. Adding 30% to this yields 2.34 Amps.
This means the 3 Amp setting must be chosen to protect
the circuit.
If you do not know the Amperage draw of the accessory you want to
connect:
1. Find out the maximum amount of power (in Watts) the accessory
uses at full power (value P).
2. If a single output circuit must power two or more accessories (such
as auxiliary lights), calculate the total value of P by adding the total
wattage of the accessories together.
3. Calculate the nominal amperage (value Y) for the circuit. Do this
by dividing value P by the twelve volts of the motorcycle’s electrical
system (value V), using this formula:
4. Calculate the total amperage limit (value I) for the circuit. Do this
by adding a 30% margin to value Y, using this formula:
As a typical example, you might want to connect two
auxiliary front lights consuming 40 Watts each to the power
circuit, in parallel. The calculation for this scenario would
be:
Adding 30% to 6.67 Amps yields 8.67 Amps. This means
the 10 Amp setting must be chosen to protect this circuit.
While a motorcycle’s charging system would typically
produce 13.8V to 14.4V with the engine running, the
calculations above use the more conservative standard
value of 12V for safety reasons.
IMPORTANT
The white (ezBUS) power circuit can accommodate a
maximum of 16 individual accessories. However, the
maximum current draw on the white circuit is still subject to
the power restrictions in this section.
If the white (ezBUS) power circuit is used, that circuit’s
software fuse is set to 15 Amps by default. The fuse setting
must be adjusted according to the guidelines in this section.
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