11-21-2018, 06:55 AM
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#111 (permalink)
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Master EcoModder
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Quote:
Originally Posted by redpoint5
You suspect because of a bright LED?
I don't think that indicates a bad cap. LEDs can be brighter or dimmer with slight differences in voltages.
I'd still test it all though. As I said, it's a good idea to charge them to the same voltage and let them sit a while and see if they discharge at similar rates.
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I'll measure it this afternoon against the others, but they all started off at the same voltage and brightness, so it's getting out of balance. How much, I'll find out.
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11-21-2018, 08:39 AM
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#112 (permalink)
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I followed an advert that appeared on to bottom of this thread. It was for DC-DC converters. Up to 600W. I said why not. Selected the one that would suit my needs.
And OH NOOO, they want 212 usd for one.
http://www.vicorpower.com/products?p...623T36G17C2T00 |
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11-30-2018, 03:35 PM
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#113 (permalink)
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11-30-2018, 03:57 PM
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#114 (permalink)
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Human Environmentalist
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Quote:
Originally Posted by Ecky
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What! Can I get in on this? That's like 1/3rd the normal price.
I've got a breaker that looks like yours rated at 300A. Haven't tried it yet.
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11-30-2018, 03:59 PM
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#115 (permalink)
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11-30-2018, 04:18 PM
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#116 (permalink)
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Whoa, with balance circuit? That's a fantastic price. I guess I never thought to check Alibaba, and Octopart doesn't search Chinese outlets.
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11-30-2018, 04:41 PM
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#117 (permalink)
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Hold off on an order until I've tested them.
EDIT: Started the car right up. Dropped by around 1v, and looked like it would have run the car for quite a while even without the DC-DC converter connected to it. I'm considering cutting the shrink wrap off so I can arrange it into a 3x2 rather than a 6x1.
Last edited by Ecky; 11-30-2018 at 05:23 PM..
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11-30-2018, 06:15 PM
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#118 (permalink)
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Sweet! So you're running caps only, and no battery?
How did you get around the problem of the DC/DC converter shutting down?
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11-30-2018, 06:16 PM
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#119 (permalink)
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Master EcoModder
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Quote:
Originally Posted by redpoint5
Sweet! So you're running caps only, and no battery?
How did you get around the problem of the DC/DC converter shutting down?
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The voltage drop is much smaller from starting the car with these, so presumably that's lowering the current.
I plan to run a battery in parallel, but with a resistor so it has no starting duties. |
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11-30-2018, 06:45 PM
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#120 (permalink)
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Human Environmentalist
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Quote:
Originally Posted by Ecky
Hold off on an order until I've tested them.
EDIT: Started the car right up. Dropped by around 1v, and looked like it would have run the car for quite a while even without the DC-DC converter connected to it. I'm considering cutting the shrink wrap off so I can arrange it into a 3x2 rather than a 6x1.
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I forgot to mention that 3x2 might be cutting it too close voltage wise for those caps. That gives you a max voltage of 13.5 assuming every cap is perfectly in balance.
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