Modern Vespa

Thinking about fitting an SIP speedo to my Rally 200.

Should be able to get the wiring to work though thought I'd check if anyone knew the power draw?

I've recently fitted a Motogadget M-unit (which works great) so will be running it off one of the AUX circuits which can give up to 10A of DC power.

It's set up with a battery and completely DC so hopefully will be straight forward.

Thanks!

Are you're asking does it have a parasitic amp draw?...yes it does. The speedo itself when activated runs off 5 volts through its power box converter. 5 volts is less than 1/2 amp.

Thanks for that.

Great to know it has a parasitic draw though as it will be a switch circuit would it be a problem if it was switched off when the ignition was off?

If it all runs off 5V that won't be a problem - had just read that it was reasonably power hungry so thought best to research.

Thanks

Parasitic draw is different from 'How much current does it draw' which Im sure is what yr after.

How did you get under 1/2 an amp Whodats?

You just need the rating of the speedo in watts. From there you can easily get running current. Either way if youve got 10A to play with then your handsomely covered up to 120watts!

Kevin

I just thought about your question, and i think i'm way off base (as in wrong) on my answer. Just because the speedo runs off 5 watts, it doesn't mean that the speedo has a 5 watt draw. So who's to say how much of a draw the speedo has. There's no doubt a couple LEDs located inside the unit? Heck, the speedo probably draws not very much power at all.

The included instructions that SIP provides can be a little difficult to interpret. I also used a Koso rev signal reader with my SIP speedo.

Thanks Kevin, that makes a lot of sense if it needs any more than 10A I'll be surprised, hell even my airhorn only pulls 6A 😂

The other option was to use a Koso motorbike computer (I think I was looking at the XR01) but then that's a 7cm square chuck of plastic on the headset

Exactly Whodat...glad I wasnt underthinking:-)

I suspect the speedo like you say has some micro leds and maybe a little 12v-5v DC-DC, some control circuitry and thats about it. If theres a backlight thats an led too so probably another 20 or 30mAmps so probably 100mA maximum or 1watt. (Cant seem to find out from SIP but other speedos are in that range)

OP...youve plenty in the tank...crack on:-)
Kevin

The "power box" is where the voltage power control circuitry is located. 12 volts into the box and 5 volts coming out the other side to the speedo unit.