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Old 01-08-2018, 04:59 PM   #91 (permalink)
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Possible solutions:

1 x 44Ah sealed-lead-acid ---------------------- ~10kgs / 22lbs
2 x 12Ah AGM + supercaps ------------------- 8.7kgs / 19.2lbs
no wooden box or hardware
1 x 20Ah AGM + supercaps ------------------- 8.0kgs / 17.7lbs
2 x 14Ah AGM + supercaps ------------------- 9.7kgs / 21.4lbs

Ideally it should be

2 x 16Ah lithium + supercaps ---------------- 7.4kgs / 16.35lbs

But this last one is out of the acceptable price range for just an experiment...

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Old 01-09-2018, 12:39 PM   #92 (permalink)
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One of the pitfalls of AGM, the jell which is electrolyte has no ability to pass gas this is why AGM Chargers are specific.
over rate charge / discharge and it will generate hydrogen bubbles witch get traped and insolate the core reducing capacity. Batteries have a C rating . A C rating is the number of times above its capacity it is Happy charging or discharging lithium ion for example typically 1C charge 5c discharge Lithium Polymer 1C charge up to 90 C discharge with the advances in technology these numbers have been bumped up to 5c charge and 180 C discharge. RC cars batteries are getting closer to being capacitors but they're still batteries
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Old 02-15-2019, 07:28 PM   #93 (permalink)
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FYI- Found a new company called skeletontech making supercaps with the same specs as BCAP3200. 2.85v and 3200 farads.

They sell a box of 10 for 480.00 € which is $542 USD. That's $54 each! Much better price than Maxwell, which I don't even think is selling the 3200s anymore.

Maybe Tesla bought the wrong company?

https://www.skeletontech.com/ultraca...836/category=0

EDIT: Just realized they want 300.00 € for shipping. Those Germans must have the least efficient shipping process in the world.
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Old 02-15-2019, 07:55 PM   #94 (permalink)
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You can get the Maxwell 3000's from China for around $20-25 per though. Same caps. I wonder if they might be B grade?

Anyhow, in other news Maxwell recently released 3.0v supercaps up to 3000F, which means we could get away with one fewer cap in the series and end up with more capacitance to boot, since you have to divide total capacitance by the number of caps.
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Old 02-16-2019, 11:29 AM   #95 (permalink)
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Oooh, I like 3v. That makes running 5x (15v max) in series less risky for exceeding any single caps voltage rating. My 5x 3400 farad caps with a 2.85v rating is getting a bit close for comfort with a 14.25v max voltage.

I just wish they would invent a cap with a 15v rating to boot, even if it needs thicker insulators and has less power density. A single 500 farad cap with a 15v rating would be sweet. No balance issues to contend with, and no loss of capacity from adding multiple caps in series.

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