e-Vibez Posted September 14, 2020 Share Posted September 14, 2020 Hey guys This is a question to other owners of the Veteran Sherman Does your wheel fully charge to 100V? Mine doesn’t go above 99.6. Is it working as intended or is this a minor flaw? Thanks for the response Quote Link to comment Share on other sites More sharing options...
Chriull Posted September 14, 2020 Share Posted September 14, 2020 24 minutes ago, e-Vibez said: Hey guys This is a question to other owners of the Veteran Sherman Does your wheel fully charge to 100V? Mine doesn’t go above 99.6. Is it working as intended or is this a minor flaw? Thanks for the response It does show 99.6V. The difference between 100.8V and 99.6V is 1.2V absolut or 1% relative. I would not expect a voltmeter with much better accuracy build into an EUC. Second point is the charger - the wheel can only load up to (almost) the no load charger voltage. I would not expect the charge to be calibrated with much better accuracy. To get a relevant first digit after the point of the voltage readings one would need a voltmeter with an accuracy of better than 0.1%... Or if one "just" has some normal voltmeter one can compare two wheels - short time stability is good enough to get a valid comparison between two voltages. 3 Quote Link to comment Share on other sites More sharing options...
e-Vibez Posted September 14, 2020 Author Share Posted September 14, 2020 Thank you for the explanation. Much appreciated! Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted September 14, 2020 Share Posted September 14, 2020 11 hours ago, e-Vibez said: Hey guys This is a question to other owners of the Veteran Sherman Does your wheel fully charge to 100V? Mine doesn’t go above 99.6. Is it working as intended or is this a minor flaw? Thanks for the response My demo would charge to 99.5-volts My production wheel charges to 99.8-volts. I know people where it goes a little above 100-volts. I wouldn't worry about. It's close enough 1 Quote Link to comment Share on other sites More sharing options...
MrRobot Posted September 15, 2020 Share Posted September 15, 2020 (edited) 8 hours ago, Marty Backe said: My demo would charge to 99.5-volts My production wheel charges to 99.8-volts. I know people where it goes a little above 100-volts. I wouldn't worry about. It's close enough How bad for the battery is it if you fully charge it to the max and then the braking regen tries to charge it more? Would this only be a real issue if you fully charged it and then went on some hilly riding or would regular stop and go riding do enough cause damage to the cells? Edited September 15, 2020 by MrRobot 1 Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted September 15, 2020 Share Posted September 15, 2020 58 minutes ago, MrRobot said: How bad for the battery is it if you fully charge it to the max and then the braking regen tries to charge it more? Would this only be a real issue if you fully charged it and then went on some hilly riding or would regular stop and go riding do enough cause damage to the cells? This is a well know issue. All wheels will tilt-back and kick you off the wheel if the batteries are full and the regeneratively charge the wheels. People that live on the top of hills usually don't fully charge their wheels for that reason. It's not going to damage the batteries because the wheel is designed to protect itself. 1 Quote Link to comment Share on other sites More sharing options...
MrRobot Posted September 15, 2020 Share Posted September 15, 2020 12 hours ago, Marty Backe said: This is a well know issue. All wheels will tilt-back and kick you off the wheel if the batteries are full and the regeneratively charge the wheels. People that live on the top of hills usually don't fully charge their wheels for that reason. It's not going to damage the batteries because the wheel is designed to protect itself. Just out of curiosity what battery level did yours come shipped? Quote Link to comment Share on other sites More sharing options...
Marty Backe Posted September 15, 2020 Share Posted September 15, 2020 3 hours ago, MrRobot said: Just out of curiosity what battery level did yours come shipped? ~95% 1 Quote Link to comment Share on other sites More sharing options...
Mango Posted September 17, 2020 Share Posted September 17, 2020 On 9/14/2020 at 1:27 PM, Marty Backe said: My demo would charge to 99.5-volts My production wheel charges to 99.8-volts. I know people where it goes a little above 100-volts. I wouldn't worry about. It's close enough Mine charges to 100.55 volts. I have one of the earlier production batches that have the really soft pedal mode and turns on when unplugged from charger — both features I actually really like. Quote Link to comment Share on other sites More sharing options...
LeGiroquoi Posted October 6, 2021 Share Posted October 6, 2021 To follow up on this topic, my Sherman charges up to 99.1V and 96% in euc world.. Normal? Quote Link to comment Share on other sites More sharing options...
RockyTop Posted October 6, 2021 Share Posted October 6, 2021 (edited) Yes, unfortunately. If you update the software in the Sherman you can adjust the voltage to 100 volts. (100.4 volts?) Edited October 6, 2021 by RockyTop 1 Quote Link to comment Share on other sites More sharing options...
Chriull Posted October 6, 2021 Share Posted October 6, 2021 3 minutes ago, Eric plam said: To follow up on this topic, my Sherman charges up to 99.1V and 96% in euc world.. Normal? Quite some time passed and some new motherboard and firmware versions happened. However - Shermann was (?is?) the only wheel without a 100% range at the "top". To avoid concerned customers most manufacturers Ccall some 4.11x - 4.2V range 100%! That's almost 10% of the cells usable range... And as written before (100.8-99.1)/100.8 is just~1.7% error shown plus maybe delivered from the charger... Quote Link to comment Share on other sites More sharing options...
RockyTop Posted October 6, 2021 Share Posted October 6, 2021 @Chriull i know we are losing a bit of range. Is this setup easier on the Batteries? Quote Link to comment Share on other sites More sharing options...
Chriull Posted October 6, 2021 Share Posted October 6, 2021 6 minutes ago, RockyTop said: @Chriull i know we are losing a bit of range. Is this setup easier on the Batteries? I don't see a specific setup - the sherman has some inaccuracy showing the voltage as the charger has with the delivered voltage. In any combination! The wheel just not showing enough just leads to a bit lower range but is otherwise irrelevant beside allowing heftier overcharges going down declines. The real lower voltage by a charger delivering a bit less should stress the cells a bit less, but in this range presumably not really noticable. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post supercurio Posted October 6, 2021 Popular Post Share Posted October 6, 2021 Usually and fortunately, chargers are pretty accurately calibrated, which gives an opportunity to calibrate the wheel's voltmeter at the end of its charge. Starting with the firmware 10.0.58, there's the option to apply a correction offset to the buit-in Voltmeter. The idea is to configure this offset so at the very end of charge, 100.8V is measured. Soon after, the wheel will finish balancing and shut itself off. After settling down disconnected from the charger, you'll typically read 100.5 to 100.2V before going to the next ride. Calibrating the volt-meter is not only for data nerds, it what defines also the wheel speed alarms and low voltage tiltback. If your wheel was reading 99.x before at the end of charge it will also mean that the maximum range will also be extended by a %. 4 Quote Link to comment Share on other sites More sharing options...
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