Kt-lcd3 Battery monitor issue

[Studio19]

I recently upgraded from a 36v battery to a 48v battery.
The kt-lcd3 display always shows 4 bars on battery monitor even if battery is actually down to eg 25%
The numerical monitor appears to read correctly (in this case 45v).
I have tried different P5 settings with no luck.
Anyone experience the same? Thoughts?

 

[m@Robertson]

You need to just keep at it on the P5 setting, which you have already figured out adjusts the graphical battery display. Voltage is not the only factor that affects display. Capacity plays a role in what you set it to.

Regardless, that graphic is almost always junk. I have been using the KT-LCD3, LCD8 (a color version in the same casing) and the Eggrider-sized LCD4 for many years. They all have very good numeric voltage readings and very dodgy graphical display. On some newer versions you can set P5=0 and it will auto-detect. But I have found this does not work at all on the LCD4 despite the manual saying otherwise. Give that setting a shot and see what happens.

Realistically, you should ignore the graphic and learn what the voltage numbers mean. That is vastly more useful, and takes very little time to become familiar with. The charts below have a little Quick Reference segment that I know some people have printed on paper, cut out the little box and planted on their handlebars. Just enough info to get them by until they don't need it anymore.

Li-Ion Ebike Battery Charge Charts

Whats an 80% charge on a 48v battery? These charts give answers to questions like this on common ebike battery voltages: 36v, 48v, 52v, 60v and 72v.

talesontwowheels.com

 

[Hoggdoc]

I recently upgraded from a 36v battery to a 48v battery.
The kt-lcd3 display always shows 4 bars on battery monitor even if battery is actually down to eg 25%
The numerical monitor appears to read correctly (in this case 45v).
I have tried different P5 settings with no luck.
Anyone experience the same? Thoughts?

Do you have the ablity to change the battery voltage via the display menu system. Look up the display see if you can find a manual for it.

 

[Studio19]

Do you have the ablity to change the battery voltage via the display menu system. Look up the display see if you can find a manual

for it.

Both the controller and display are supposed to be automatic in recognizing 36 or 48v

 

[m@Robertson]

Good point. Voltage is auto-sensing so really all you are trying to do is match the scale to your battery capacity. And it never seems to work right. But you can get lucky and, after some trial and error, figure out something reasonably acceptable. Also FWIW all of the KT displays I use work just fine with 52v/14S systems.

If you want to find a good LCD3 manual translated by a native English speaker, google "Dillenger KT-LCD3 Manual". The one thing it does not have that newer editions document is the C5 0, 1 and 2 slow-start settings which all work, but are listed as 'undefined' in the older manuals.

dillenger KT-LCD3 manual - Google Search

The second manual on the list from eleccycles.com is also a very good English translation that is a little newer, so it documents the slow-start settings