24V battery on Panasonic 26V
- Thread starter traceour
- Start date
36v motor controllers generally cut off power due to low voltage when a battery drops below 29-31v, (mine is 31v but others ??) iirc a 24v battery fully charged is 29v.. so while a 24v battery fully charged may start a 36v motor system on the bench it wont have any juice to move you any distance before the battery protection kicks in.
IIRC, the Panasonic crank-motor won't run with an ordinary battery. It has to be the Panasonic one. Try german Ebay. There's usually a few large capacity ones there. Search for "Panasonic akku"
Hm, sure? Only 3pins on my bike, but if I bypass that, my question is how the bike will behave on 24V?
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In the case of lithium-ion batteries, 24v is 26v. It's just a preference for what people call them. They're both 7S, which charge to 29.4v and run down to 21v.
No, it not 3 pins it is a 5 pin system, different pins used for drive or charging. You have to use a correct Panasonic battery and charger only. See this web page and scroll down for pin information:
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You need to look at the battery connector on the bike. If it has only two wires connected to it, you can use any 24v battery. If it has three wires, you need to investigate the function of the third wire, then either provide it or spoof it.
It has to have three connections to operate the motor and four connections between charger and battery with this motor and battery system.
What's the function of the third wire?
AFAICS in your pictures, the battery connector has two wires-red and white. Is that a very old one with NiHM battery?
This one seems to show 4 wires:
Fitting a new panasonic motor & display
Just go a new motor 300w 26v 170111228 & led display bj 2013 they came with no instructions or wiring diagram (you have to wire a plug) does any one know on the net where I can find them? Neil
www.pedelecs.co.uk
This shows comms with 4 wires:
This shows three wires:
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Yes.
Here's the loom for these lithium battery motors showing the three battery connections lower left: Link
People across Europe have been trying for years to run these with other batteries, seemingly without success. When Kalkhoff wanted to run them with larger capacity batteries that Panasonic provided, they employed German battery maker BMZ who faithfully followed the Panasonic system in every detail.
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There's something about how to do it here. There's a link to a French forum, where there are more details. On ES, the guy said that he by-passed the BMS and it worked, but on that French forum, the it looks like the BMS was used.
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PANASONIC ebike battery change
Hi experts, I have a BH pedelec bycicle with a Panasonic motor and a standard battery pack of 26V x 8A. After 3 and half years of loyal services I guess that very shortly this battery has to retire :-) With the Cycle Analyst I can see that the voltage sag is huge and that capaciity is down at...
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They of course had their units to play with, something I never had with the lithium system. A further difficulty is that these had different versions according to the bike maker's requirements. That thread starts with a BH bike with the lower power system and 8Ah battery originally created by Panasonic for Dutch maker Gazelle, and these motor versions had internal differences.There's something about how to do it here. There's a link to a French forum, where there are more details. On ES, the guy said that he by-passed the BMS and it worked, but on that French forum, the it looks like the BMS was used.
PANASONIC ebike battery change
Hi experts, I have a BH pedelec bycicle with a Panasonic motor and a standard battery pack of 26V x 8A. After 3 and half years of loyal services I guess that very shortly this battery has to retire :-) With the Cycle Analyst I can see that the voltage sag is huge and that capaciity is down at...
When my French contact who had access to some units expired through heart attacks, my source of information on those differences went with him.
And since Panasonic soon changed to 36 volts and European bike makers dropped them anyway, there was little point in pursuing this.
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Traceour's pic only shows three pins , I would unscrew the top and investigate if all three are wired and or what the third may connect to or do if connected.
If indeed only two wires are connected then a generic 24v battery can be used or even have the original recelled into the old case.
If indeed only two wires are connected then a generic 24v battery can be used or even have the original recelled into the old case.
Easy mistake if you haven't been involved with ebikes since the dark ages, like we have. Why did they call it 26v, when everyone else calls it 24v? It's not as bad as when KTM called their bike 47v, when it had a 13S battery. I think that was a trick because EN15194 says "up to 48v" and they wanted to make sure that it was definitely below, even though it charged to 54.6v.
If you are using a 26v panasonic battery on an old 24v panasonic motor it will still work. I recently tried that and all works OK. Old NiMH batteries were designated as 24v.
The red wire is positive 26v and it is protected by a fuse or a resettable safety cut out within the battery. The middle wire is also positive 26v but not protected by the fuse. I think it simply provides a low current to displays etc. The black wire is the negative terminal.
If your old panasonic motor has only 2 wires then it is important to connect the positive wire to the red fused supply because there is no protection fuse within the panasonic motor. If the safety cut out operates you have to open the battery case to reset it.
The red wire is positive 26v and it is protected by a fuse or a resettable safety cut out within the battery. The middle wire is also positive 26v but not protected by the fuse. I think it simply provides a low current to displays etc. The black wire is the negative terminal.
If your old panasonic motor has only 2 wires then it is important to connect the positive wire to the red fused supply because there is no protection fuse within the panasonic motor. If the safety cut out operates you have to open the battery case to reset it.
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