@740GLE SOC is taken from the JK BMS (non-inverter older one).
Here is a view after a charge to 3.45v per cell, followed by a few minutes by a 10a load then a 30a load applied. Interested to know what you're thinking.
EVE 105 48v 2p16s build
- Thread starter ChrisG
- Start date
Here is a view after a charge to 3.45v per cell, followed by a few minutes by a 10a load then a 30a load applied. Interested to know what you're thinking.
Awesome, So you’re getting the expected AH out of these cells. Do you have a trend of cell voltages through the discharge cycle. Looking to see if your pack voltage sag aligns with my 48v pack.
Last edited:
How can I get that information?
Not sure on your setup. I have an ESPHOME that reads values of my JK BMS and saves it in HomeAssistant
Didn’t even think about temperature impact on cell discharge. My cells are in the basement of our cabin and it’s 10°C there at the moment as seen in the temp probes on the BMS and confirmed by my tempstick device (awesome product by the way). The discharge curve and voltage drop is different below 25°C as seen in the EVE 105ah data sheet below. They only have -20°C listed in the sheet but I assume sag gets progressively worse from 25°-> -20°. Think this answers my voltage sag concern/question. Thoughts? Last picture is a 87a load on the battery so about 4300w.
Brucey
Solar Wizard
What tester is that?
That’s looks awesome. Seems to be $240 US on Aliexpress. Any problems with it yet?
I am still testing but is very well made. Looks like American good quality very beefy. It record everything and take pictures and time laps. Amazing for the price. Amazon has it for about $600
It took less than 2 weeks to arrive.
This one was the seller.
Just found this amazing item on AliExpress. Check it out! $231.00 50％ Off | Uni-t Uti260A Uti260B Thermal Imager Camera 256x192 Image Thermographic Construction Repair Infrared Water Leak Electronics Home
Just found this amazing item on AliExpress. Check it out! $231.00 50％ Off | Uni-t Uti260A Uti260B Thermal Imager Camera 256x192 Image Thermographic Construction Repair Infrared Water Leak Electronics Home
So still screwing around with this pack. Learning more and more based on what I think the voltage sag cause is which changes daily. Now I’m into busbars again.
Check my math and here may be the problem:
Copper=1.2a/mm2.
Busbars: 12.5mm x 2mm = 25mm2
Busbar Amps: 25mm x 1.2a/mm2 = 30amp max.
Does this mean the max the busbars that came with the 105ah cells is 48v x 30a = 1440 watts?
Check my math and here may be the problem:
Copper=1.2a/mm2.
Busbars: 12.5mm x 2mm = 25mm2
Busbar Amps: 25mm x 1.2a/mm2 = 30amp max.
Does this mean the max the busbars that came with the 105ah cells is 48v x 30a = 1440 watts?
I stacked my busbars with 2 for each.
That seems like the best plan.
Yes, is easy, clean and cheaper than using 2 or 4 awg wire+connectors.
This ones are the one I ordered.
Those are wider and little thicker than the ones that came with my batteries and look to handle 49amps. Two of those on every connection would get you to a .5c discharge of 100amps with 2p16s which is actually 200a.
@ZEUS-FL do you know what size bus bars you ordered for your 105ah cells. They have a few choices and I’m not at my batteries to measure. Looks like the 1.57in Pitch-Row is the right size. But want to make sure.
Last edited:
