JK BMS (200A 4S 2A Balancing) Low Temperature Protection and Heater Tests on a 200AH DIY JKOTREK
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- čas přidán 29. 08. 2022
- JKOTREK is a DIY 200AH 12V LiFePO4 battery in a plastic detergent container. It is constructed of four CALB 200AH cells and a 200A 4-8S 2A JK BMS, with heater version. Low current bench tests were carried out focusing on heater control for low temperature charging and low temperature charging protection. Their control parameters were customized for our applications. Test results were impressive. Charging stopped and the heater (simulated) came on as soon as one of the two NTC temperature sensors measured temperature at the programmed protection-level. Charging resumed and heater went off when temperature got to the programmed release-level.
you could extend the screen timeout.... good info about the low temp protection. Thanks.
Dissapointed you didn't show us how the Actual wiering connection between the BMS snd tbe heater.
It will depend on the power (wattage) of the heater. The heater version of the JK BMS comes with a heater cable and plug. If the current draw of the heater is less than 3A, then just connect the two heater terminals to the positive battery terminal and the heater cable per direction, real simple. If the draw is greater than 3A, a solid state MOSFET switch module can be used to drive current from >3A up to 30A, as those used in 3D printer heated bed for ~$10 from Aliexpress.com. The JK heater cable will be used to control the switch and the heater power can come directly from the battery positive and negative terminals. You can also buy from Amazon.com www.amazon.com/DEVMO-Printer-Heating-Controller-Extruder/dp/B0897KP6FZ/?_encoding=UTF8&pd_rd_w=JYJyi&content-id=amzn1.sym.e4bd6ac6-9035-4a04-92a6-fc4ad60e09ad&pf_rd_p=e4bd6ac6-9035-4a04-92a6-fc4ad60e09ad&pf_rd_r=8ZV5340GVQ7BQRKKFXKT&pd_rd_wg=klLPW&pd_rd_r=3cfb62ee-cdb1-47e0-8bb1-27652283d1e3&ref_=pd_gw_ci_mcx_mr_hp_atf_m
Andy would be very disappointed that you used ice water for the low-temp test. The only negative I see about the JK is that the heater output is coincident with low-temp cutoff. Would be nice if the heater could be programmed with a higher set point so charging doesn't need to stop at all. Maybe in a future firmware update...
I agree Andy did the low-temp cutoff test the right way but unfortunately beers and gout are a poor mix for me. Heat will generate within the battery due to internal resistance when charging the battery. I could not come up with strong use-case scenarios that suggest the need for separating the low-temp cutoff and heater turn-on events.
Remember the old days when you paid $200 - $300 for something brand new and it came with INSTRUCTIONS ?
Does anyone know what the setting "charg. plugged" is ?
I would also like to know. I don't understand which charger he is referring to
I think it is for a "smart charger" (whatever that is?) that uses the connection at the heater connector of the BMS ... the non green pair of wires...
I too LOVE the documentation that JK provides... NOT!!!
I can not find any information for the life of me the wiring instructions for the heating port. I have two small black and red tiny 28 awg wires and 5 green 28 awg wires. I have taken the green wires and fused them together and tied those to my positive leads of my 3 heating pads. The negative leads from the heating pads will be wired to run to my mega fuse box. What do I do with the small red and black wires. They are tiny, I feel like I am missing something simple.
What is the total current consumption for your heating pads?
I think they are for a "Smart Charger" for heating only. But I too question the miniscule wire gauage of the red and black...
I was thinking of conncting a small solar panel for heating my battey . JK's documentation is crap and does not reveal much about the heat function or the "Smart charger" . I see in the app an item " Heat Current" above the "Heating Status" wich may monitor the current from the red and black wires on the BMS heater connector?