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[Keith]

Discharge was stopped by Arduino after one hour and forty minutes discharging at 1600W, went from 100% to 32%SOC, no timeout occurred. Nothing to see in BMS log, shows key off, entered charging state, entered idle state after 1:40. So off bike rapid discharge using enable pullup works fine as long as pack is fully charged to start. If I could find a 100VDC inverter...

Just to gripe, I was unable to get battery logs in three tries with current app, progress bar froze. Used a very old app version to get them.

[motornissen]

I'm queues, how do you read the BMS log? Can you connect to the BMS board directly? Do you know if the contactor pre charges before closing, when you use the pull-up method?


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[Keith]

I'm getting BMS logs using the Zero App (with difficulty ) and decoding with the online parser. I've seen that Dr. Bass connects directly to the BMS but it requires a special cable. I'm not sure about precharge but I don't think it matters on closing. I am a little worried about opening under load, that might hurt the contactor so I plan to switch AC loads (post inverter) off before removing the enable. This is all academic unless I find a suitable inverter for the 96-116VDC input range, no luck so far. But I can run DC loads like light bulbs and heaters! Here's the full BMS log from my 1.6kW test. It doesn't even mention that the contactor opened due to removal of the enable.

Code: [Select]

09287     08/30/2017 18:38:54   Charged To Full            002 AH, SOC: 89%,         L:4027,         H:4030, B:003, PT:031C, BT:042C, PV:112769
 09288     08/30/2017 19:09:33   DEBUG: Switching to voltage SOC mode. SOC: 100%, VSOC: 100%, Ihall: -1605mA, Iext: 0mA   
 09289     08/30/2017 19:09:52   SOC adjusted for voltage   old:   173418uAH (soc:100%), new:   0uAH (soc:100%), low cell: 4147 mV
 09290     08/30/2017 19:10:57   Key Off   
 09291     08/30/2017 19:10:57   DEBUG: Entered Idle State   
 09292     08/30/2017 19:11:03   Current Sensor Zeroed      old: 2522mV, new: 2521mV, corrfact: 235
 09293     08/30/2017 19:11:04   Discharge level            000 AH, SOC:100%, I:000A, L:4130, l:4130, H:4133, B:003, PT:032C, BT:041C, PV:115693, M:Idle
 09294     08/30/2017 19:11:08   Key Off   
 09295     08/30/2017 19:11:08   DEBUG: Entered Charging State   
 09296     08/30/2017 19:11:08   Contactor was Closed       Pack V: 115722mV, Switched V: 0mV, Prechg Pct: 0%, Dischg Cur: 0mA
 09297     08/30/2017 19:11:08   Contactor drive turned on  Pack V: 115722mV, Switched V: 0mV, Duty Cycle: 34%
 09298     08/30/2017 19:11:09   SOC adjusted for voltage   old:   0uAH (soc:100%), new:   0uAH (soc:100%), low cell: 4117 mV
 09299     08/30/2017 19:11:09   Discharge level            000 AH, SOC:100%, I:006A, L:4117, l:4133, H:4121, B:004, PT:032C, BT:041C, PV:115344, M:Charge
 09300     08/30/2017 19:11:13   SOC adjusted for voltage   old:   0uAH (soc:100%), new:   0uAH (soc:100%), low cell: 4115 mV
 09301     08/30/2017 19:20:10   SOC adjusted for voltage   old:   0uAH (soc:100%), new:   2340000uAH (soc:91%), low cell: 4027 mV
 09302     08/30/2017 20:51:29   Key Off   
 09303     08/30/2017 20:51:29   DEBUG: Entered Idle State   
 09304     08/30/2017 20:51:35   Current Sensor Zeroed      old: 2521mV, new: 2519mV, corrfact: 237
 09305     08/30/2017 20:51:35   SOC adjusted for voltage   old:   2340000uAH (soc:91%), new:   16900000uAH (soc:35%), low cell: 3577 mV
 09306     08/30/2017 20:51:36   Discharge level            016 AH, SOC: 35%, I:000A, L:3578, l:3578, H:3584, B:006, PT:033C, BT:038C, PV:100238, M:Idle
 09307     08/30/2017 20:51:59   Voltage Across Contactor: 100458mV (Okay)

[motornissen]

I planed to use cheep eBay parts, for my first setup. Going from a 54v panel to a zero battery. From there to a 12v 200ah Thundersky battery, and from there to 220ac and 5v D.C. Not the most efficient way, but a way to get started. But the first step up crept overheating, and finally it blow up. But now I'm planning to use two zero batteries in series, and run a switch mode charger directly from there. And a D.C. D.C. Converter to a 12v battery. Making 220vac and 5vdc. This will make it possible for me to charge all my Ev's from the battery, without a executive 220vac inverter. What do you think?


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[motornissen]

Sorry for the auto "correct "....


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[Keith]

Two Zero batteries in series might be a good idea, I am considering it but probably for the inverter source. So far it doesn't look like the Zero Quiq chargers that  I have will run on DC, I know other chargers will. I wonder if your 12v battery will supply enough power.

[motornissen]

I think diginow has a charger that might work. the 12v battery is just a buffer. The plan was just to run the garage/office, witch only has a small 220v consumption. My main draw comes from charging my Ev's. and this way I can make a mean fast charger.


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[Shadow]

I think diginow has a charger that might work. the 12v battery is just a buffer. The plan was just to run the garage/office, witch only has a small 220v consumption. My main draw comes from charging my Ev's. and this way I can make a mean fast charger.

I'd heard DC input for DigiNow SCv2 would be detected by firmware and shut the unit down as a safety measure. There's no published results nor support for this functionality based on what is known about the modules and the DigiNow SCv2 product. Are you suggesting that you've tried this successfully?

[motornissen]

No, I just remember someone telling me that it might be possible. But I've done it with a lot of other chargers.


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