Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
OPUS/Liitokala power consumption when 4 batteries (dis)charge
#1
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?
Reply
#2
In an ideal world a completely flat 18650 2200mAh battery would take 4.4 hrs to charge and 4.4 hrs to discharge at 500mA. ½ that time if you are doing it at 1000mA.
500mA per cell X 4 is 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 cycle would be drawing 700mA at 12V for 4.4 hrs for a total of 3080mAh or 3.08Ah or 36.96Wh
That is in a perfect world.
In the real world add 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 hrs is 880mAh.

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

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
Reply
#3
Wolf are you mixing mA and W with mAh and Wh?
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
Reply
#4
(05-10-2019, 07:24 PM)daromer Wrote: Wolf are you mixing mA and W with mAh and Wh?

Yea I guess the hhhhh oh the keyboard h works again  Tongue

Corrected
Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
Reply


Who read this thread?
29 User(s) read this thread:
daromer (05-10-2019, 07:24 PM), Lekr (05-19-2019, 08:31 AM), RikH (05-14-2019, 07:42 PM), Overmind (05-13-2019, 11:51 AM), beserker786 (05-11-2019, 04:19 PM), Lucan (05-15-2019, 05:20 PM), Omalik (05-11-2019, 08:12 AM), juanjo57 (05-11-2019, 10:59 AM), ben teker (05-11-2019, 10:32 AM), pacmix (05-13-2019, 11:48 PM), Karesi (06-04-2019, 12:11 AM), Androfire (07-10-2019, 02:42 PM), transposon (07-19-2019, 05:18 PM), Wolf (05-11-2019, 03:28 AM), Shawndoe (05-10-2019, 09:34 PM), emuland-metroman (05-11-2019, 06:01 PM), Sean (05-10-2019, 07:56 PM), Korishan (05-10-2019, 09:54 PM), watts-on (05-11-2019, 09:10 AM), BlueSwordM (05-15-2019, 08:39 PM), Geek (05-16-2019, 11:12 PM), Oz18650 (05-10-2019, 09:13 PM), jonyjoe505 (05-14-2019, 02:37 AM), Ibiza (05-10-2019, 08:29 PM), Zvonko000 (05-11-2019, 07:40 AM), Oliman (05-10-2019, 06:34 PM), 100fuegos (05-10-2019, 09:04 PM), HikingGuy42 (05-11-2019, 01:51 AM), Celeritous (07-21-2019, 04:18 PM)

Forum Jump:


Users browsing this thread: 1 Guest(s)