My E-Max 90S has epilepsy

Hi,
we've got an e-max S110. When we bought it new we had a problem. The batteries where loaded and displayed as full, when driving a few meters, the voltage goes down and we've got the same message like you "low battery, charge battery". Our local dealer assumed that one cell in the battery package is damaged and works not correct. The whole battery pack (4 with 12V/60A each) was changed and everything is right. Our dealer meant that the best way is changing the whole battery pack.
Did you check all connectors ?
Do you know someone who has the same e-max for leaning out his battery pack, to see if you will have the same error. When yes, I assume that it is a damaged controller unit.
Pherhaps it is possible to test the controller too, with a know good one.
When both (battery and controller) items are good, then I think it is an error in the wiring (broken cable, contact problem).
Hope this helps you.

Greets from Germany

In the mean time, the situation worsend. More and more often this happens. It even happens without load when I charge the battery.
53,5 V on the display. I will now check for contact problems.

Where are You in Germany?

Current state: switch in, 53,5 V in display, "Battery low message", some seconds later "Battery empfty" message.

Was even not possible to move out of the garage.

June 1: it's a little bit downhill, suddenly "low battery, charge battery". After OFF/ON speedometer
shows 10 km/h to much. 60km/h on a flat street, 10 km/h when i have stoped at a traffic light.

The speedo issue occurs when you turn off the bike before the needle has reached 0kmh.
its a calibration issue that hasn't been fixed.

Matt

Yesterday, I have been driving 5 km midday and 23 km in the evening.

Turn on - 2 or 3 seconds full power - 15 to 20 secondes reduced power, power off, turn off.

So I had to turn off and on again about every 200m of driving.
Doing this, the needle of the tacho nearly made a full turn around,
coming near 0 km/h from the other side.

So I hoped yesterday, I can use my E-Max 90S at least with this strange driving style.

But today, the situation worsened. Cut of the engine after 1 second instead of 20 seconds.

My E-max 110S has the same...
Well, not quite, but very similar.
I'm wondering if after 2700km and 20months of usage, the battery pack is gone...
Actually I can only drive 25 km before reading the voltage drop to 44V... Is it normal?
I did'nt notice it earlier.
Any suggestion to check anything is welcome.

Lead batteries have a limited usage, but at a 110S, they should last more than 5000 km.
When the battery is low after only 25km, try to check the voltage of each battery
while the scooter is on the stand, light switched on.

Maybe one battery is lower the the others.

When the lead batteries are at the end, try to change to lithium iron phosphat.

My pack has now nearly 15000 km.

Today I was to repair my E-Max 90S.
18 km to Pidding, 8 times stoped because, no engine after off on action

With a box form the E-Max general distributor in Germany. 2 line display, 4 buttons. The box is connected to the opened controller with a 4 wires plug.
An idea was, that the undervoltage value has changed. But all settings had been like expected.

SET UNDERVOLTAGE
(30-42) 42

I set tha value to 30V. The scooter goes much better, but after some hundred meters again "battery low recharge" and "stop vehicle for battery empty"

Telephone call to the German E-Max distributor, some ideas, but nothing works.

So I change 2 other values:

ACCEL SECURITY ON changed to OFF, so when I turn the key OFF and ON again, no error message, that the accelerator was tunred during switching ON
I MAX UNDERVOLT (3-MAX) 15A changed to 30A, so I have more power when the mad controller lowers output power.

The condition now:

Sometimes the scooter works good, only every 15 second turn key OFF ON.
Sometimes the eigine works only for seconds ot even does not start.

This changs from minute to minute. Just driving 45 km/h, only every 15 seconds OFF ON, suddenly this does not help.