Controller + battery in same bag - heat issue?

[pn_day]

Hi all
I've got my parts from BMS battery and have started building up.

I have an s12s and a 20 Ah battery that both just fit in a trunk bag side by side or controller underneath and battery on top.

Should I be worried about heat?

The other option is that I could put the controller in a side pocket in the trunk bag, but waterproofing in the side pockets looks less good.

Thoughts?

I'm running the stock 23A at the moment, but may solder the shunt to give closer to 30A once all the other building and wiring is done.

Thanks
Phil

 

[Deleted member 4366]

All my bikes have the controllers in the bag with the battery. I've never had a problem with heat.

 

[pn_day]

Excellent. Thanks Dave. Will take the easy option then and put in the same compartment.

 

[Deleted member 4366]

Just a thought. All my bags are single layer fabric, not thick padded ones so the heat can get out.

 

[Geebee]

Just for anyone else reading this, it depends on the controller, I have ones that run cold (no problem) and ones that run warm to hot under load, just check after riding a bit especially up a long steep hill, I had a bike that cut out on hills due to this.

 

[Alan Quay]

I had a controller get so hot that the ink on the sticker melted and came off. That was because of those crap bullet connectors failing, but it got very hot.

I was glad it was seprate from the battery.

 

[pn_day]

Thanks all. I'll do some experiments once it is all built up - was going great until the inner tube in the rear wheel blew. Now I rather regret getting big marathon plus tyres that only just fit in under the mudguards!

 

[KirstinS]

Slightly off topic so apologies

But how did you blow up a marathon plus ? Riding through a police stinger ?!

 

[pn_day]

But how did you blow up a marathon plus ? Riding through a police stinger ?!

Fair comment. It was the tube that blew. Pinch flat I'm guessing. The sidewalls are rather stiff, and I've been a bit optimistic with squeezing the largest tyre I can in the space all contributing to a loud bang on the stand shortly after inflating the tube!

 

[Deleted member 4366]

Did you have a rim-tape?

 

[pn_day]

Did you have a rim-tape?

I did, but I think I might have been using a tube for max 35mm tyre. The new ones
are 42, so this might have contributed to it as well.