Battery and electronics to mate with Panasonic front hub motor.

[Zebede]

The battery is shot on my Gazelle C7 HF but the front wheel Panasonic motor is fine.
Any recommendations for new battery and electronics to fit and save me scrapping great bike.
Cheers

 

[Nealh]

How many wires for the motor connector (show us a pic of connector).
Is the PAS a TS set up or cadence ?

If the bikes uses comm's then replacing every thing bar the hub to a generic set up will cost about £250 - £350 .
A KT controller kit would be the best control system to use and a chance to upgrade the bike to 48v if already 36v.

 

[Nealh]

One can't mate a controller with the bar display so one will have to buy a controller and display together.

If one buys a cheap controller /dsiplay kit £30 - £40 then one will rely on crappy speed control and no user input to control the power.
Spend £75 - £100 on a KT controller/display kit and one will gain nice current control power with user freindly control of how much power to use with five assist levels.

 

[Nealh]

Memory serves me right that the PAS is TS.

 

[saneagle]

The battery is shot on my Gazelle C7 HF but the front wheel Panasonic motor is fine.
Any recommendations for new battery and electronics to fit and save me scrapping great bike.
Cheers

It's been done a couple of times before. Use Google to search the forum. I think it wasn't as straight-forward as a normal motor, but I can't remember why.

 

[Zebede]

Pics of existing setup as requested

 

[thelarkbox]

Trace the cable from the motor to its First connection, disconnect and photograph the motor end to validate its a standard 9x or 3x connection configuration. (probably 9x) .

while the basic 4x pin battery connector initially looks promisingly simple, the "D" labelling on the 2 thinner wires indicate data communication which is not a good sign for simple generic battery replacement, making a complete system overhaul to power the motor more likely the solution.

 

[saneagle]

Trace the cable from the motor to its First connection, disconnect and photograph the motor end to validate its a standard 9x or 3x connection configuration. (probably 9x) .

while the basic 4x pin battery connector initially looks promisingly simple, the "D" labelling on the 2 thinner wires indicate data communication which is not a good sign for simple generic battery replacement, making a complete system overhaul to power the motor more likely the solution.

There was a KTM that used a Panasonic hub motor. It also had those two thin wires on the connector, but they weren't present on the other side, so were probably only used for battery diagnostics. OP needs to check what's on the matching connector. Sometimes they're used for a light on the end of the battery, and sometimes for remote switching, so it's not a disaster yet, but the D you spotted is worrying.

 

[Nealh]

We need to see the hub motor connection/connector .
If it isn't a std type fititng them one can still use it by sorting out the wires at the controller if one opts for a generic system change.

 

[Zebede]

Thanks. The wiring seems to go from the motor, through the frame, and straight into the battery connector on the rear of the bike. There is no obvious way to dissemble this and see how many wires are used !

 

[Nealh]

Motor wires will go to the controller/pcb , it will be accessible some where .

 

[saneagle]

Thanks. The wiring seems to go from the motor, through the frame, and straight into the battery connector on the rear of the bike. There is no obvious way to dissemble this and see how many wires are used !

Isn't there a little box thing on the back of the fork covering the connector?

 

[Zebede]

Aha ! Yes there is a box on the front fork. That's the good news.
I need to find my Allen keys before I can get at it.
Will look in the morning and report back.
Thanks

 

[Zebede]

 

[Zebede]

Looks like 3/4 wire direct to motor BUT a separate cable, presumably control wires, go round back of main connector. Difficult to get clear shot. Also noticed what looks like a crushed black wire on motor connection but that would not affect the main battery problem. So, looking for a way to retrofit new system utilising existing Panasonic motor ?

 

[saneagle]

The photos are pretty bad. Can you show EVERYTHING that is inside the box in a way that we can see?

 

[Zebede]

Sorry but that is everything that was inside a very small box.
There is the large white connector taking the power and the small connector, presumably control wires. Does that help ?

 

[saneagle]

Thanks. It looks pretty well standard apart from the types of connector and the colours. When you get a new controller, you'd have to cut the connectors off and do some soldering.

If you plan to use the superior and more expensive KT controller, you'll have to go through the 36 connection combinations to find one that works, or you can get a controller with "self learning" or "intelligent identification" that figures it out for itself.

There are many ifs and buts concerning what you need, but your bike will work if you get a new battery, controller, LCD and left side pedal sensor. Only do that if you really like the bike because you can buy reasonable e ikes for around £600.

When it comes to specific advice for the pedal sensor, you need to show a photo from underneath that shows the spacing between cranks and BB.

 

[Nealh]

The three phase wires (thicker ones ) are non std compared to China stuff today , the sense wires are coloured to almost std bar the Grey which may be the speed wire .
If converting to a generic controller I think the option for now if it were me would be to leave those wires as they are connected and get the sequence correct first at the controller end having found those wire ends.

For the little extra that the KT costs (approx. £50 ), it is well worth that extra in the long run to have the five differing power levels and the dual voltage . One coul dopt for 48v rather then 36v.

 

[Nealh]

For finding the correct wire combo at the controller end of the wiring temporarily use household wire connector strips to insert the wires in to and then use the phase/hall chart to find whichtwo or three of the 36 wire combo's work.