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Category: Yuba Mundo eV4

Ebikes – DBMS issues with counterfeit parts

Posted on April 6, 2018April 6, 2018 by Dave

The DBMS worked fine for 50 or 60 km, but the behaviour of the various components – batteries, motor and controller and DBMS started to get erratic, and it started to get difficult to tell what was going wrong. I slowly removed items until I was back to a normal set up on both bikes,…

Ebikes – dual battery managment system more riding.

Posted on March 17, 2018March 24, 2018 by Dave

Two more days of testing, a week apart, building on the numbers from day one. Total kilometres over the three days 66.4  and total time on road 3h22m, giving an average of speed of 20kph or thereabouts. The bike was definitely starting to get sluggish towards the end, and the gauge on the bike was…

Ebikes – dual battery management system – first rides

Posted on March 14, 2018March 14, 2018 by Dave

I have waterproofed both the DBMS and the power meter, so am feeling a bit happier about going out for a ride or two. I did my first ride just after I finished the basic unit, but it was all a bit short and hilly to get a grip on what was happening. I had…

Ebikes – dual battery management system – build and install

Posted on March 9, 2018March 9, 2018 by Dave

Build After a few months of designing, prototyping and waiting for all the components to arrive, I finally had enough to build a working, install-able prototype of my Dual Battery Management system. It is still a prototype, and like all prototypes is too big, too heavy and too expensive. I am not an electronic designer,…

EBikes – Dual Battery Management System

Posted on January 3, 2018March 9, 2018 by Dave

The only commercial developer of dual battery electric bikes I have seen to date is Bosch, who do an optional Dual Battery kit, which one or two manufacturers have taken up. Being proprietary technology, there is not a lot out there about it. The only two things I can glean are: 1. The real technology…

Yuba – display woes

Posted on November 21, 2017November 21, 2017 by Dave

After just a couple of hundred kilometres, the main display unit described below stopped working correctly. It bega with it occasionally not switching on first time, needing a repeat try, and this gradually got worse until it was taking 6 or 7 tries to get it switched on. Eventually it reached the point where it…

Yuba dashboard upgrade part 2

Posted on September 15, 2017September 15, 2017 by Dave

The new display panel has arrived, and was promptly fitted. Immediate thoughts were that it switched on and worked out of the box! Second thoughts were that the settings were also pretty good out of the box, with the exception of the top speed, which was set to 25kph. This is fine in those  countries…

Yuba dashboard upgrade

Posted on September 7, 2017September 7, 2017 by Dave

A few posts below I mentioned that the handlebar display panel was a fairly standard C963 display panel, branded as a Lekkie. It is based on the KM5S made by King-Meter. A quick review of its capabilities compared to what the KM5S manual contains shows that it is quite heavily customised. I am not sure…

Yuba – another ride in Kapiti with Lynn

Posted on July 10, 2017July 10, 2017 by Dave

Having spent a hard week in the workshop, and most of Friday and Saturday digging a patch of clay over in the back garden, Lynn and I decided to have a trip out on Sunday. I wanted to show off my new found knowledge of the Kapiti cycle ways, so we put two bikes on…

Yuba – another go at the long ride.

Posted on July 10, 2017July 10, 2017 by Dave

So Tuesday 4th July, I took the car back to have the service and WOF finished (replacement radiator and steering rack bracket), and I put the bike on the back again. Same drill, set off from Kapiti Honda at about 8:00, on a slightly overcast morning, so no sun strike this ride. Rather than use…

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