About time Dual 1000 watt bosch batteries to be retro fit

[soundwave]

it will be fitting the 2nd batt to the frame as you will need to drill the frame and bang goes ur 5 year warranty.

any dealer with the bosch software will be able to turn on dual batts as they do it them self on the german site for a long time now.

tbh id rather put a 2nd batt in a back pack as bike is to heavy as it is lol

 

[Deleted member 25121]

On dual battery R&M / Bosch bikes the controller switches between them to keep them at approximately the same voltage as they discharge, you can see this on the Kiox (and maybe other) display which shows each battery voltage separately. The batteries are certainly NOT wired in parallel in the bike.
I don't know whether the controller electronics for a single battery bike supports the use of dual batteries in this way, even if the firmware could be changed.
Putting batteries in parallel is best avoided, as other posters have pointed out. Another reason not mentioned so far is that if one battery pack is charging the other then energy is actually being wasted in that its not being used by the motor.

 

[soundwave]

that is 2 cables in to one so it is in parallel other wise in series that batts voltage would double and still be 500w.

 

[Deleted member 25121]

View attachment 31625

that is 2 cables in to one so it is in parallel other wise in series that batts voltage would double and still be 500w.

Yes, it parallels up the batteries and is best avoided.

 

[soundwave]

the above is the bosch dual batt cable lol, the only way to add capacity to a batt is in parallel.

 

[Deleted member 25121]

the above is the bosch dual batt cable lol, the only way to add capacity to a batt is in parallel.

No, the dual battery R&M / Bosch bikes do NOT have the batteries in parallel, see my previous posting.

 

[soundwave]

No, the dual battery R&M / Bosch bikes do NOT have the batteries in parallel, see my previous posting.

well you are wrong.

 

[sjpt]

ebiker99 didn't suggest they were in series. In a sense they are parallel, but (he says) with the importance difference that they are switched, so either one or the other is connected to the rest of the system at any one time, and they are never connected to each other.

If that is so I don't see much advantage over having two batteries and swapping them as needed (VERY slow switching), and leaving one at home quite often on shorter rides.

 

[Deleted member 25121]

well you are wrong.
View attachment 31626
View attachment 31627

I know the difference between series and parallel connections, so what??

On dual battery R&M / Bosch bikes the controller switches between the 2 batteries to keep them at approximately the same voltage as they discharge, you can see this on the Kiox (and maybe other) display which shows each battery charge individually.
For example, the display might show battery 1 at 65% and battery 2 at 68%. Battery 2 (only) will be used until it drops to 65% ie
battery 1 at 65% and battery 2 at 65%
at this point battery 1 will be be used until it drops to 60% ie
battery 1 at 60% and battery 2 at 65%
at this point battery 2 will be be used until it drops to 60%
etc etc.
I can't remember the exact numbers here but they (hopefully) illustrate the point that I and other posters have made.
I've a dual battery R&M ebike and I know first hand that this is how the batteries are used, they are NOT connected in parallel and for very good reasons.

 

[soundwave]

it might switch between the 2 batts with software but the cable is wired in parallel other wise the voltage would be double and still be 500w.

 

[Deleted member 25121]

ebiker99 didn't suggest they were in series. In a sense they are parallel, but (he says) with the importance difference that they are switched, so either one or the other is connected to the rest of the system at any one time, and they are never connected to each other.

If that is so I don't see much advantage over having two batteries and swapping them as needed (VERY slow switching), and leaving one at home quite often on shorter rides.

That's correct sjpt, for shorter rides I can leave the top battery at home, the space left in its carrier comes in handy for tools, cans of beer etc etc

 

[sjpt]

ah ... extra battery for you instead of for the bike

 

[Deleted member 25121]

it might switch between the 2 batts with software but the cable is wired in parallel other wise the voltage would be double and still be 500w.

That is not the cable used inside R&M / Bosch ebikes. I suspect it's a 3rd party product looking at the poor wiring quality.

 

[soundwave]

That is not the cable used inside R&M / Bosch ebikes. I suspect it's a 3rd party product looking at the poor wiring quality.

it is pmsl

Bosch eBike Dual Battery Cable Kit – e-bikeshop.co.uk

The new Bosch eBike Dual Battery cable kit. Doubling the Bosch eBike capacity - 1000Wh is possible using 2 x 500Wh batteries.

www.e-bikeshop.co.uk

Kit Dual Battery Y-Kabel für zwei Rahmenakkus - Pro-Cycling-Golla

Kit Dual Battery Y-Kabel für zwei Rahmenakkus -

www.pro-cycling-golla.de

 

[Deleted member 25121]

it is pmsl

Bosch eBike Dual Battery Cable Kit – e-bikeshop.co.uk

The new Bosch eBike Dual Battery cable kit. Doubling the Bosch eBike capacity - 1000Wh is possible using 2 x 500Wh batteries.

www.e-bikeshop.co.uk

Kit Dual Battery Y-Kabel für zwei Rahmenakkus - Pro-Cycling-Golla

Kit Dual Battery Y-Kabel für zwei Rahmenakkus -

www.pro-cycling-golla.de

If it is a genuine Bosch part, which I very much doubt, it cannot be putting the batteries in parallel can it?
The first advert says "Retrofitting is not compatible with non DualBattery bikes, this has to be done in-house by our specialist eBike technicians with access to diagnostics to reformat the bike. " If the cable was simply putting 2 batteries in parallel why would the firmware need to be updated???

 

[soundwave]

you can only connect batts together 2 ways and it is how all ebike batts are made.

 

[Deleted member 25121]

you can only connect batts together 2 ways and it is how all ebike batts are made.

I'm reminded of a brick wall.

 

[soundwave]

If it is a genuine Bosch part, which I very much doubt, it cannot be putting the batteries in parallel can it?
The first advert says "Retrofitting is not compatible with non DualBattery bikes, this has to be done in-house by our specialist eBike technicians with access to diagnostics to reformat the bike. " If the cable was simply putting 2 batteries in parallel why would the firmware need to be updated???

because bikes with no dual batts need it to be turned on buy a dealer with the bosch software any dealer with it can turn on dual batts same as the lights as turned off if none is fitted.

if you wire 2 36v batts in series you will have a 72v 500w batt, it would not even turn on wired like that and if it did would blow up the motor.

 

[soundwave]

this place will fit the kit for a price!

Electric Bike Sales

electric bikes uk, electric bikes near me, electric bike shop, electric bikes sale

www.electricbikesales.co.uk

 

[Deleted member 25121]

this place will fit the kit for a price!

Electric Bike Sales

electric bikes uk, electric bikes near me, electric bike shop, electric bikes sale

www.electricbikesales.co.uk

To quote the advert:
"Not only can you reliably call upon more power when needed but you can also make use of the Bosch 6Amp fast charger with a clear conscience because it will alternate charging between the batteries to avoid extra stress (and therefore wear) caused by fast charging. "
If the batteries were wired in parallel the charger wouldn't be able to do that, would it...
The controller uses the same system when using the batteries to power the bike, it alternates between them.