Hard wiring Tom Tom Rider 400 2014 DL1000 - Page 2 - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
DL1000A - 2014-2016 DL1000A - 2014-2016 (L4-L6)

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post #11 of 17 Old 04-23-2019, 09:29 PM
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The formula for determining how long it'll take parasitic drain to deplete 10% of the battery capacity is:

Time (hours)=0.10 x C1/lp C1 is the battery's rated capacity in amp/hours and lp is the parasitic drain in amperes.

If you have a 14 amp/hr motorcycle battery and a .02 amp parasitic draw, it'll take 70 hours to drain 10 percent of the battery's capacity. LOL, I know you didn't ask for this info, but I was curious so I checked the numbers. If someone left his bike sit for two weeks in between rides, he could lose about half the battery's capacity just from it sitting there with that minor amount of current drain. This is for AGM/lead acid batteries; I have no idea if it's the same for the lithium batteries.

It does make an argument for putting in some kind of switch or disconnect in a device with a parasitic drain when it's attached directly to a battery, if their bike sits a lot and they don't have it attached to a battery tender.

I'm no electrical wizard; I just happened to look this up a while back when I first learned about parasitic draw.

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Last edited by RCinNC; 04-23-2019 at 09:46 PM.
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post #12 of 17 Old 04-23-2019, 11:07 PM
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I don't think the draw is correct.

I have my bike for several weeks without the tender on. And no dead battery. The GPS mount for the Zumo powered up but GPS in the car.

..Tom

2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
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post #13 of 17 Old 04-23-2019, 11:38 PM
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It wouldn't be dead, Tom, only decreased to about the 50 percent capacity mark after two weeks in a 14 amp/hr capacity battery. I don't know enough about batteries to say if a fifty percent battery would start a bike. If your battery has a higher capacity than 14 amp/hrs, then its 50 percent capacity would be greater, with a better chance of starting a bike.

If I'm not mistaken, the cradle for a Tom Tom has a built in transformer to step down the voltage from 12 volts to 5 volts. I don't think 20 milliamps sounds high for that.
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post #14 of 17 Old 04-23-2019, 11:50 PM
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Maybe the Zumo mount doesn't have the same parasitic drain?

..Tom

2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
2015 DL1000 New July 2015 180,000+ km, 112,000 miles.

This can help preventing from cars pulling out in front of you (SMIDSY)
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post #15 of 17 Old 04-23-2019, 11:58 PM
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That's entirely possible, Tom; I have no idea. I figured Rolex must have measured his with a multimeter to confirm the drain, and that's how he came up with the 20 milliamp number.

I get out of my element pretty quickly on electrics and electronics. The stuff I know is mainly specific to projects I've done for my bikes, and I'm no authority by anyone's metric. I use a Garmin Nuvi on my bike, which I plug into a USB power port that's wired into a 12V to 5V buck converter, which is in turn wired to my PC8.

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post #16 of 17 Old 04-24-2019, 02:25 AM
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It is a 0.02amps draw because of the 12v to 5v drop down, my bike rarely sits more than a week but it has sat for 6 weeks with no tender and problems starting up.


I'm still on the original 2014 battery.


I had my 2009 650 set up the same way and it still had the original battery when I passed the bike down to my younger brother in 2016/2017 ?

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post #17 of 17 Old 05-01-2019, 05:59 PM
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Iíve connected my TomTom 400 directly to the battery of my 1000 without any issues.

I do put the battery on trickle charge if I know I wonít be using to for a couple of weeks and also through Winter and Iíve noticed no issues.


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