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    Polarized breaker wiring

    So jumper bottom instead of top. Same result.
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    Polarized breaker wiring

    Really doesn't matter top or bottom. Key is jumper protects "flow" polarity from either direction. A polarized DC breaker is designed to extinguish arc in one direction...thus "polarized". If flow is from - to + pole it may be less efficient or totally ineffective at extinguishing arc as...
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    Polarized breaker wiring

    Wiring with jumper across top will facilitate extenguishing the arc in the event your assumption of highest potential or cause of fault is reversed. If used as disconnect only no problem wiring through just one side. For best protection of circuit against faults, wire in and out bottom with...
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    Giandel vs any cheap Amazon inverter

    The Vevor 3000VA not watts. Mine is happy up to about 2200 watts then gets touchy. Surges ok when mini split starts but if anything else us drawing it will alarm and occasionally shut down. They can be picked up on eBay for around 219 right now. Took a gamble for small mobile camping unit as...
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    Zketech EBC-A20 software frozen

    Probably already tried this but throw it out...clean usb contacts on data cable from tester and check continuity from end to end. Also may want to try another input port to computer. Memory serves mine was flakey on one of my laptop ports. Switched ports and been rock solid for weeks now.
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    Zketech EBC-A20 software frozen

    ? dyslexia kicked...been few late nights! 3.58 to 3.15. Corrected post. I may adjust limits with more testing but finding mV matter with this chemistry. 3.65 to 2.5 being accepted hard limits to prevent damage. Seems to be more than expected (based on published curve data) no load V drop...
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    Zketech EBC-A20 software frozen

    Great you are up and running again! Firmware fail may have been issue and fixed when reloaded software. I've been leary of fw upgrades on most non-mainstream purchases from China. If it works ok when I get it...don't upgrade/fix it. Seen lots of magic smoke over the years. Sometimes "good"...
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    Water Drops Inside Lifepo4 Battery Case

    Correct. Simply a display of system voltage. I'm betting loose connection somewhere and/or out of balance cells. Issue 1: pack not sealed in vacuum so moisture present in air in case. Low ambient Temps and swings in Temps coupled with heat generated by bms and other electronics in case...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    Cell 4 tested to 311.8 AH after full charge, rest, discharge, rest, partial charge to 3.3V tail 2A. After 10 hour rest Cell 4 was again discharged to 2.5V (72.02 AH removed), rest, then charged to 3.65V tail 15A. Tester registered 312.7 AH into Cell. .9AH more than discharge test. Cell 1...
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    Research into extending lithium battery life

    Good way to test type T fuses...periodically dead short your pack for its health and longevity...and proof of design safety?!? ? Now I sound like a politician!
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    Zketech EBC-A20 software frozen

    What version of software are you running? Current version is V1.8.5 and can be downloaded from forum...search file section beginner corner. Also check settings in control panel for power saving options (Microjunk software). The only thing allowed to sleep should be your display. Depending on...
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    Research into extending lithium battery life

    Interesting that it is almost reverse of LA. Don't desulfators for LA pulse charge current in attempt to shed deposits from plates and re-emulsify them? Almost fell for that marketing until I automated equalization monthly. Would imagine it would have to be at least 1C and a burst, second or...
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    Weird battery behavior (and solar)

    Would guess temperature and bms settings for both issues. Spec sheets on 206ah SOK show nominal V at 12.8 reading that at 20-25F is actually good. You warmed battery in garage ~30 degrees so voltage would naturally increase. Even though ambient temp was in 30's would not be surprised if camper...
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    Water Drops Inside Lifepo4 Battery Case

    Voltage applied to a circuit will equalize based on current and potential. I have to believe your battery has more potential and will "drag" the voltage of the charge source down to battery level until current of charge source causes battery to saturate thus raising voltage of entire system...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    Spent most of morning doing slump tests and compiling data. All cells appear to be within 2mV of each other in testing at 40A load and sampling voltage at 2, 4, 30, 60, 120, and 180 seconds. Overlaying plots leaves a thick smooth curve across 3 minute test. Really don't see any anomalies that...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    @Browneye Shenzhen is the city in China. Docan and Basen are company or business names. Have noticed some suppliers (companies) with same name but will differentiate from each other by adding city name first. Not really sure if they are the same business or competitors. Dongguan is another...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    @Browneye Docan is a different vendor. I would contact them about threading issue on your post. Most reviews of Docan are favorable so keep us posted on how they handle your issue. @RCinFLA Only had time to check 4 cells. 2 that I full cap tested and 2 new. Interesting results and I believe...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    Revised process: Quick 3 minute 40A test on each cell logging and comparing voltage sag. Looking for any anomalies indicating cell issues to investigate. Will use sag values to group cells for packs. Then if all cells are in acceptable range, discharge each to 2.5V, rest 5 min, charge to...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    @RCinFLA Awesome information. Thank you for taking time to share! Going to revamp my approach to quick testing each cell and implement @smoothJoey test to top charge/balance. Quick math will save ~5 hours per cell. Currently testing to 3.65V with tail of 15A (value per factory data sheet)...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    Looks like this one stabilized at 3.380 after 30 min then 40 amp load slump to 3.344. At 3.293 steady 30 min in. Can't zoom on plot until test completes. Will verify then.
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    @RCinSo is there an expected slump or will I create my baseline based on known good capacity cells? Also you think 40 amps is sufficient being less than .2C? I do see the necessity of more accurate lead positioning for this task. Caught this test at the end with current trailing off. 3.65 on...
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    I need to start thinking outside of the box. Going to start experimenting with next few cells. In middle of second charge/discharge test now.
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    Hadn't thought about that...good idea. They all started a 2.93 to 2.94. Ended test a 3.0 looking for settling close to origin for top balance. Longer charge but save time overall I think. Thanks! @smoothJoey
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    One down 23 to go. Looks like going to average 17hrs per cell test. 311.8AH
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    Experience purchasing cells from Shenzhen Basen Technology Co. Ltd.

    In a hurry...skip to spoiler...last paragraph and pictures. Been lurking in the shadows and dark corners of this forum for months now...I have to say the information and general knowledge, not to mention helpfulness, of you members is priceless. Would never have attempted this project without...
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    CATL 271Ah cell issues.

    @Pyrofx Lets be PC here. Remember...he identified HIMSELF as "a small person". He felt midget was condescending!
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    Off grid internet

    Both Verizon and AT&T have newer "Rural Internet" plans. We are in rural Ohio with no access to cable or DSL. Tough to find associates that know much about them. Kids game and stream aLoT so I kicked them off my AT&T plan. Mine is unlimited 4g with Netgear Nighhawk router. With kids on we...
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    Is this risky? SanTan used panels with backside vinyl cracking, tested good, no signs of moisture

    Sorry, fire may have been too harsh. "Thermal event" is the official description. https://www.businessinsider.com/tesla-solar-panel-fires-become-nightmare-some-homeowners-2019-10 Probably don't see much as there were multiple Walmart installations involved also.
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    Is this risky? SanTan used panels with backside vinyl cracking, tested good, no signs of moisture

    What was original brand? Trina Solar panels were recalled and some have made it back to market used. Watch below... If going into purchase informed and mount where possible short/fire can be contained...to each their own. Would not mount them on a structure of any sort.
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