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Author Topic: Adding extra batteries  (Read 214 times)

Erasmo

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Adding extra batteries
« on: February 12, 2017, 09:25:00 PM »

I'm not planning to(at least for now ::)) but it has been done in a few occasions, with perhaps the most notable case being Terry Hershner's Streamliner:



IIRC this is a pre-2013 model Zero so things might have changed by now, but I'm curious if you'd be able to upgrade a later bike in a similar way and how it is pulled of in the first place. The wiring etc. might not be the hardest thing but making sure the bms accept the new capacity is maybe harder to figure out.
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protomech

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Re: Adding extra batteries
« Reply #1 on: February 13, 2017, 02:11:27 AM »

With Terry's bike, I believe each additional battery had its own BMS - they were ZF3 modules.

Short answer - Zero does support a single additional battery module via the Power Tank, in theory this could be extended to additional modules.
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BrianTRice

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Re: Adding extra batteries
« Reply #2 on: February 13, 2017, 05:24:12 AM »

Terry did bring that up as a kind of a poll/teaser: http://electricmotorcycleforum.com/boards/index.php?topic=6208

I think there are unknowns with getting more than two BMS' to play well together. They all have to agree to close their contactors to cooperate and cell voltages could get out of sink.

What Terry did was with the 2012 platform so it's a little different but he literally went the extra mile to bring that project together.

Come to think of it, the interconnects in the main Power Pack (or the Long Brick) don't work across BMS' (one BMS handles all cell voltages through the interconnects) and that's probably a contributing integration factor.

Without OEM support, buying a long brick (which I think Terry was aware of but couldn't discuss at the time) and trying to harness it like a Power Tank would require someone to make a professional-grade harness like the Power Tank integration.

Then there's the fact that each single brick is 42lbs which is tricky to place. One on each side of the battery compartment ("BMW Boxer" style, low and forward, probably held by the crash bars) is achievable but the "long brick" is not the form factor for that so you get 2 BMSs to add instead of one.

A "long brick" might mount where the Power Tank goes if you put a larger cowling over it and had really good bracing for it. Then you'd put chargers on the crash bars.
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Erasmo

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Re: Adding extra batteries
« Reply #3 on: February 13, 2017, 11:08:17 PM »

Oh yes I remember that topic now, I scanned it quickly but I am also curious on the technical aspect of it, especially if/how it's possible to make a Zero accept auxiliary batteries, either Zero another make.
With the SC and fairing in the works the bike will be pretty complete for now, but you never know if you can pick up a Zero/Leaf pack for cheap after a crash or something. Might be worth to throw it in a little trailer for long trips, but before acquiring one it would be nice to know if it is possible at all.
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