OPUS/Liitokala power consumption when 4 batteries (dis)charge

ben teker

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Apr 9, 2019
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In general, how long will take a dis+charge cycle for an average 18650 (+/- 2200 mAh) cell on OPUS and Liitokala charger? 4 cells charging together. What will be the power consumption for each of the chargers?
Like to get these numbers for calculate/build a 4s 12V battery (4s20p,4s40p ?)
Ordered for this small project 80 new cells (2500 mAh NKON.nl), a 4s smartBMS, a kit from diybatterystore.com and a battery capacity controller.

These 12V battery will feed 2 (dis)chargers; Opus BT-C3100 and Liitokala Lii-500.
Then the proces of testing cells can start on a small base. Solar panels on the shed will charge these 12V battery. When this battery is ready I prefer to avoid taking power from the net for testing cells and set up power wall.

Future plan is to build a power wall, step by step. Harvested already few thousand cells (18650). Not tested any of them yet.

Anyone who can give me experienced OPUS/Liitokala charging numbers, please?

image_wcoxvr.jpg
 
In an ideal world acompletelyflat 186502200mAh battery would take 4.4 hrs to charge and 4.4hrs to discharge at 500mA. that time if you are doing itat 1000mA.
500mA per cell X 4is 2000mA
Current draw for charging 4 cells at 500mA (2000mA at 4.2V) is 8.4 Watts
8.4 Watts at 12V is 700mA
Your charging cyclewould be drawing 700mA at 12Vfor 4.4 hrs for a total of 3080mAhor 3.08Ah or36.96Wh
That is in a perfect world.
In the real worldadd a 20% loss (616mAh)in heat and resistance to the total 12V amperage so required is 3.696Ah per charger.

What the current draw is during the discharge cycle I have no idea but it can't be much. For sake of argument lets say 200mA
200mA X 4.4 hrsis 880mAh.

So my estimatewould be that you would require a total of 4.576Ah for the complete cycle on one chargerwhich is 54.912Wh

Wolf
 
Wolf are you mixing mA and W with mAh and Wh?
 
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