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![]() | #21 | |
Gone Wild ![]() ![]() Join Date: Sep 2012 Location: Charlotte, NC
Posts: 6,348
| ![]() Quote:
A series cart will only go over voltage during charge, but a Sepex can also go during Regen brake. If using a Sepex cart you need to allow for the Max cell voltage to be higher than the average for Full charge so there is head room if the Regen brake is used hard immediately following a full charge. The folks that have the Zeva can tell you how long the monitor shows the balancing cycle after the charge, some earlier Zeva datasheets specified up to 1 hour balancing sessions. The diagram in this post uses 2 additional relays, 1 to detect the charger is plugged to AC and one to place the Zeva in sleep mode. The LV and HV relays are also wired so either condition can trigger a safety shutdown regardless if it happens during motoring, Regen braking or charging. Lithium Battery Conversion - LV & HV control relay wiring | |
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![]() | #22 |
You're a daisy if you do ![]() ![]() Join Date: Sep 2015 Location: North Carolina
Posts: 1,950
| ![]() After charging today and giving a 2 hour buffer after the charge, I activated the sleep function. I was at 58.1v, so we'll see where the voltage is in a few days. |
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![]() | #23 |
Gone Wild ![]() Join Date: Oct 2012 Location: Southwestern Pa.
Posts: 2,858
| ![]() I've read...and re-read the documentation.....and I can't see an explanation of how the system "wakes up." I assume when I turn on the key on? |
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![]() | #24 |
Gone Wild ![]() ![]() Join Date: Sep 2012 Location: Charlotte, NC
Posts: 6,348
| ![]() The Zeva remains is sleep mode as long as the "sleep" pin is connected to negative, once you open the switch and remove the negative the system wakes up. |
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![]() | #25 |
Gone Wild ![]() Join Date: Oct 2012 Location: Southwestern Pa.
Posts: 2,858
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![]() | #26 |
Gone Wild ![]() Join Date: Oct 2012 Location: Southwestern Pa.
Posts: 2,858
| ![]() I got the "Special 70Old's Racer" switch ![]() ![]() Click the switch and it works like a charm!!! ![]() BTW.....I didn't give this much thought, but with the ZEVA in sleep mode, the cart is still able to drive. Well, I didn't drive it but I turned on the key switch and got a power reading on my separate digital voltmeter. With the F\R contact switch in "N" I hit the go peddle and got the 3 (or maybe 4?) Alltrax controller "good to go" blinks. After thinking about this, the ZEVA monitors the pack and would shut down the "juice" if a LV was detected......but only if the ZEVA were active. My controller is set (as a backup) for a LV cutoff as well.....but that's just the total pack voltage....not an individual cell voltage. Anyway.......just thinking out loud. |
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![]() | #27 |
Gone Mad ![]() ![]() Join Date: Oct 2009 Location: Buford, GA
Posts: 7,506
| ![]() My 11/11/11 (2011) pack still works pretty dammm (ha, enough Ms fools the auto-censor) good, so I'm kinda trying to learn for the day... Since we have series carts - no regen - seems like a relay or two could automate this. Monitor charger and key switch. I think it may have been posted, but I'm just filing it away for now. |
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![]() | #28 |
You're a daisy if you do ![]() ![]() Join Date: Sep 2015 Location: North Carolina
Posts: 1,950
| ![]() So, I'm not too pleased with the sleep function. I still have a good parasitic draw on my pack and the only thing it could be coming from is the BMS or the key switch controlled voltage reducer. Sunday my pack was 58.1v Monday it was 57.4v Tonight it was 56.1v ![]() |
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![]() | #29 |
Gone Wild ![]() ![]() Join Date: Sep 2012 Location: Charlotte, NC
Posts: 6,348
| ![]() Have You looked for other sources of power drain? Zeva claims the BMS will draw 8mA while in sleep mode, that is the equivalent of 1Ah after 5 days and it could not possibly have that voltage drop impact. There is not a standard wiring diagram for these setups so it is hard to troubleshoot unless you have something you can post. The voltage converter should be suspect as well since it is directly connected to the pack at all times and always drawing some current even if the trigger is OFF. Is the charger directly wired to the pack or isolated through a relay? |
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![]() | #30 |
You're a daisy if you do ![]() ![]() Join Date: Sep 2015 Location: North Carolina
Posts: 1,950
| ![]() Now that I'm thinking about it, I have my charger connected through a HV relay. I disconnect my charger via a Anderson SB50 connector when not in use, but now I'm wondering if the relay along with the reducer is the culprit? |
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