What are you referring to? The battery connects to the vesc and that connects to the motors. I’d be moving the vescs closer to the motors actually.
My apologies, missed that. Just be sure the voltage spikes don’t fry your caps (so measure them), and in turn your VESCs. That would be an expensive mistake to make.
I think I’m missing something…
Moving the vesc closer to the motors is good, but moving them away from the battery in the form of a battery backpack opens the opportunity for inductance from the long power cables, so it would still be good to be adding (more) capacitors to the vesc input to tolerate that?
That was my thinking! The caps weren’t specced for long battery cables.
Why would you want a battery backpack?
The longer the wires the greater the wire diameter will need to be for the same load. Either side of the Vesc.
to create a super portable solution like this
Cool build but what if you fall on your back?
Backs are flexible, and most all proper backpacks (like the one I use) has a load-bearing / stiffening / ventilation sheet between it and your back, so not like there’s no protection. Obviously you also encase the battery in a LiPo charging (fire safe) bag.
I just meant that in the sense that those 200$+ each rc escs on the back of the backpack look a little crushable… but that’s just me
Right, I’m working on getting them more integrated, and soon they’ll be mounted inside the zip pouch at the top, which will be zipped open for ventilation during use.
I think @Chibatterysystems might be able to chime in on the backpack idea since he’s been using one
Isn’t his as an auxiliary pack to charge the one on the board though?
My backpack parallels to my board so I can use my board alone, my backpack alone or both of them together. Biggest drawback is the board and backpack always have to be at the same voltage to connect them safely.
Been using it for over 2 years
It doesn’t charge my board, it powers it.
What do you use against voltage spikes? Details?
@Chibatterysystems they are talking about wire thickness and potential need for extra capacitors ¯\_(ツ)_/¯
Thankfully I changed bags from that ugly ass bag to an obed. So comfy now.
Originally I was going to use a large cap bank in the backpack, I thought I’d run it without it and see how it went. It works perfectly fine without it, just thick 8 awg wire is enough.
Just to mention, I can and have used it with the backpack alone but I don’t make it a habit and when I do power it off my backpack alone, I don’t gas it.
My theory on why it works so wel is that there is an onboard battery (12s3p 21700) which handles most of the amp output. I would assume the current comes from there initially and the backpack sort of ‘recharges’ the board in times of less amp draw
Which is my point, so you do always have a battery board side, to which your backpack parallels? With mine the only battery is in the backpack.
Yea sorry I didn’t read anything before when I was tagged.
I think if you didn’t have a battery in the board, you would need some very thick wire, and a cap bank the size of a small esk8 battery lol.