February 27, 2018 at 8:59 am #4711
Trip switch has been sent.
KenFebruary 27, 2018 at 10:01 am #4712
I’ll let you know how I get on.
MarkFebruary 27, 2018 at 1:30 pm #4714
This is not straightforward and it is not at all analogous to a fuel tank in a petrol vehicle because the discharge profile of every battery is different.
The remaining capacity of a battery is measured in KWh but this is impossible to measure so the instrumentation uses the drop in the voltage of the battery as a proxy. But that’s a bit like trying to measure water temperature by sticking your thumb in. So the change from four bars to two does NOT mean that the battery has used half of its capacity.
So how do you know how many miles you have left?
Actually I don’t think you can- you will only know you have run out of juice when the bike stops and for various reasons this might be at a different place each day. I have never had to push one home yet but I do tend to err on the side of caution. There are things you can do to extend range- charge the battery in warm conditions, drive more slowly and decelerate not brake. The last tip in particular should make a lot of difference.
Of course there may be a fault in your battery- if you think there is let us know and we will test it and replace if necessary.March 2, 2018 at 12:13 pm #4715
The replacement trip switch arrived this morning with the first post since the Beast from the East. I’ve installed it and everything seems to be fine electrically. Unfortunately conditions aren’t good enough here for a test drive just yet but I’ll do that as soon as I can.
Would you like me to send back the original switch for testing?March 2, 2018 at 6:09 pm #4717
Thanks for the information Ken.
I have no doubt this cold weather isn’t helping but I still feel somethings not right. After only 4 miles the speed drops to 24/25, its as if the battery is already losing power after a short trip. I will charge the battery inside and see if that makes a difference but I’d rather not remove the battery daily to charge inside. If this doesn’t help I will contact you to send the battery back for testing.
ThanksMarch 2, 2018 at 6:44 pm #4718
What temperatures are you operating the bike in? As the temperature gets down to Zero, you will already have lost 50% capacity from a full charged battery at 20 deg C. It is the science of the battery. As soon as you start using it the off load oltage will fall dramatically, and the “fuel gauge” will reflect that. Battery technology has not yet invented a cellthat will perform well at sub zero temperatures at a price that people wil payMarch 5, 2018 at 11:58 am #4719
I’ve replaced that trip switch and taken the bike for a short run of a mile or so and it seems to be behaving itself. I’ve some business in town tomorrow which will give it more of a workout. If that goes well, I’d say we’ve fixed it.
I may have a post mortem on the old switch later.
Thanks, Ken.March 6, 2018 at 1:01 pm #4720
I’m operating the bike in temperatures anything between 0 – 8 degrees I guess, UK weather. Let me see how I get on with the better weather and report back.
Would you expect the 27mph to be the correct top speed at full charge? What everyone else’s experience? I weigh about 80kg.March 6, 2018 at 1:46 pm #4721
This is correct.
The specification on the bike states a top speed of 45kph which equates to 27.9mph. It is a digital display so of course it will state 27mph.
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