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The finish-ish of a pcb based 14S 80P powerwall
#31
LOL But it's a bright idea Tongue
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#32
Yeah, making me all confused ...  Tongue
But now its on... you gonne have leds, if you want them or not, Korishan is gonne be on it too ... 
We start tomorrow Wink
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18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
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My setup: https://secondlifestorage.com/t-Instant-powerwall
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#33
(08-13-2018, 09:52 PM)wim Wrote: Grumble and Tim are right ... i am wrong ... ( sleepy eyes, chould be in bed    Wink )

Night Wim.
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#34
(08-13-2018, 09:49 PM)Korishan Wrote: V in the diagram is more akin to the "Load" circuit and the power source together. That portion was just not added.

So if we instead put a Battery symbol and a Load symbol where the circled V is, this will be more true to the actual meaning of what was meant.

(08-13-2018, 08:12 PM)w0067814 Wrote: The only way that LED shall light up is if the protected cell voltage collapses to such a low level that the difference between the pack +ve and the individual cell exceeds the forward voltage drop of the LED. So the method posted is only really capable of detecting a cell with internal short that discharges it deeply or fully.

I'm guessing you are stating this because the LED in the diagram is backwards(?) and therefore wouldn't work unless the flow of power was in reverse. However, the diagram does not show Pos or Neg, so it doesn't matter. The resistor can be on either the cathode or the anode side of the diode and work just the same.


If you wanted true detection regardless of flow of current, two diodes could be connected in parallel but in opposite directions. This would allow the LED to be visible under discharge and charge.
As wim stated, this application is already in place in car fuse boxes (that is, if you buy those particular fuses. they are a bit pricey, imho). So it does work

It is true. It would be unlikely to work. It wouldn't work if a cell went short circuit. It wouldn't work if a cell went open circuit.

Even if a fuse blew, the LED wouldn't light until the cells in the rest of the pack had a voltage difference great enough for the LED to glow. This could not happen.
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#35
(08-15-2018, 01:59 AM)Geek Wrote: It is true. It would be unlikely to work. It wouldn't work if a cell went short circuit. It wouldn't work if a cell went open circuit.

Even if a fuse blew, the LED wouldn't light until the cells in the rest of the pack had a voltage difference great enough for the LED to glow. This could not happen.

Ahhhh, hahah now that makes sense Tongue

yeah, I didn't think about the voltage difference with the rest of the pack. The other option of it working if there was a high enough draw on the pack to force current to leak past the led. But, that'd have to be a LOT of current draw.
Hrmm, back to the chalk board.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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Certified 18650 Cell Reclamation Technician
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#36
(08-15-2018, 02:22 AM)Korishan Wrote:
(08-15-2018, 01:59 AM)Geek Wrote: It is true. It would be unlikely to work. It wouldn't work if a cell went short circuit. It wouldn't work if a cell went open circuit.

Even if a fuse blew, the LED wouldn't light until the cells in the rest of the pack had a voltage difference great enough for the LED to glow. This could not happen.

Ahhhh, hahah now that makes sense  Tongue

yeah, I didn't think about the voltage difference with the rest of the pack.  The other option of it working if there was a high enough draw on the pack to force current to leak past the led. But, that'd have to be a LOT of current draw.
Hrmm, back to the chalk board.

The current would probably have to be so high it would blow all the other fuses  Tongue

I have been thinking about a way to do this myself, but nothing springs to mind. If a fuse does blow, it is just going to require visual inspection. The only other circuits that would do this would be way to complex to implement on a per cell basis.
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#37
I say we lynch Andy, for even bringing it up.
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#38
(08-15-2018, 10:01 AM)grumble Wrote: I say we lynch Andy, for even bringing it up.

It would be a brilliant idea, if someone could figure a way to make it work.
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#39
Comin along.

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#40
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