Backpack battery

[Mathurin]

Oh, yeah, well I dunno for insane speeds but for handling there's no contest. Went riding on a skating rink and found I could push the bike further then with the weight on the rack, it seems a bit more forgiving too. It's nice & nimble, I can actually jump potholes by opposition to having the back wheel slam into them, there's a lot to be said for that.

I lack the tonus for this weight so my reactions like to jump stuff takes maybe 1/3rd more time, gotta think ahead. The extra weight makes my legs and arms feels like I went for a longer ride then what I actually did.

With a lithium equivalent, the backpack would weigh only about 1/4th the weight, lighter then my coat gloves & all. That would make all the difference in the world.

Another plus to the backpack is the bike no longer needs the heavy bad ass steel rack, a conventional aluminium rack will do. Sorta like free weight reduction, win-win!

 

[Reid Welch]

Aha! I just knew it: You are a reincarnated former pack horse.

:lol:

(3) 12v 12ah SLA batteries in a backpack with chest and belly straps, 14Kgs:

 

[Mathurin]

So I got a nice new backpack from mountain equipment co-op and now I want to figure a realistic way of cramming batteries into it.

I want it to work for at least an entire winter, preferably with no special needs other then charging. This, in a pack that will have to be sorta flexible, or maybe made of several rigid modules that have some freedom between them or something. I want a charger I can carry with me, weight including bag, charger, wires etc to be <7Kg and capacity to be >300wh.

To get an idea the size of the pack, it almost fits two 12packs of cans. Would carry them no problem due to it's design with straps and stuff, but the top wouldn't be closed. To determine practical usable space I've tried with a 12 pack and with a binder.

The best place seems to be the sides, each can fit a pack that's ~5" wide, ~1" thick and ~16" tall, so ~160 cubic inches. There's convenient pocket things on the top sides of the bag, they could hold up packs on the sides using a semi-rigid plastic sleeve or something.

This color is called sage, btw.

That's the idea anyways, now to figure how to make it happen somehow.

 

[Malcolm]

Just finished tidying up my battery storage. Like you I didn't like the feel of the battery pack strung out on the seat rack. Much happier with this arrangement. Bike weighs 40lbs and 36V 10Ah backpack weighs 13lbs. Still looking around for the right connectors. These are XLRs with the latch removed, so I can just yank on the cable to disconnect quickly if I need to. I found the Andersons just came apart too easily. I unpicked some of the stitching in the left shoulder strap and fed the cable through it before attaching the XLR. The speaker cable is really flexible. 4QD controller fits in the little seat bag. I'll keep an eye on the temperature, but it's barely got warm so far.

 

[Ypedal]

On the E-BMX i've been taping the andersons together with a loop of lectrical tape, and click the other end to the controller, if me and the bike go our seprate ways it disconects at the bike and not in the backpack.. ! :wink:

 

[Mathurin]

D'you suppose a block of 4 powerpoles with pins and stuff would do the trick?

 

[Lock]

Read this thread a while back and forgot to reply... `cept to suggest hips not backs? Like, a pouch(s?) on a belt, w/suspenders maybe? Getting the weight of the pack lower down. For handling, maybe comfort too?

I kinda like the concept of a pack that's wired up along your sleeve to a plug by the handle... Step away/unplug from the vehicle and it is powerless and lighter w/out pack. As a second pack would compensate for warm mitts and vests (electrically heated) for winters and/or house loads
tks
lOck