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Author Topic: Spli Positive System with Led Charging Feedback  (Read 7849 times)

Offline SkyWatcher123

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Re: Spli Positive System with Led Charging Feedback
« Reply #15 on: August 01, 2018, 07:27:06 PM »
Hi gyulasun, thanks for the reply.
Yes, sometimes i get too excited, though i calm down and see things more clearly.

Just finished another test run, with swapping and all, the circuit operated for just about the same duration.
Recharging the lithium ion packs now,  will see how many watt hours is placed back into them, for an efficiency comparison to the previous test run.
I just need to keep in mind, that when i use the digital charger to discharge the 3 cell parallel pack for this experiment, the digital charger is only showing the power used for 1 cell, since I have 3 in parallel, the pack was actually drained of 3 times what is shown on the charger.
The experiment shall continue.
peace love light :)

Offline SkyWatcher123

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Re: Spli Positive System with Led Charging Feedback
« Reply #16 on: August 02, 2018, 06:52:21 PM »
Hi all, the results are looking consistent.

This latest test run, the duration was 4 hours 16 minutes.

44.84 total watt hours used during testing and swapping.
32 watt hours used by led load, in split positive position.
23.9 watt hours used to recharge both lithium ion battery packs, back to 4.2 volts per cell.

Total system efficiency = 1.88 COP
Led load efficiency       = 1.34 COP

It may be possible to gain more efficiency, by using a load in the split positive position,
that is more within the c20 rate of these particular lithium ion cells.
I think these results are due to the high charging efficiency of lithium ion cells.
Where as, if we were using lead acid, the led load efficiency would probably be below COP 1.
Thoughts, questions or comments are appreciated.
peace love light  ;D