voltage

Voltage, also known as electric pressure, electric tension, or (electric) potential difference, is the difference in electric potential between two points. In a static electric field, it corresponds to the work needed per unit of charge to move a test charge between the two points. In the International System of Units, the derived unit for voltage is named volt.: 166 The voltage between points can be caused by the build-up of electric charge (e.g., a capacitor), and from an electromotive force (e.g., electromagnetic induction in generator, inductors, and transformers). On a macroscopic scale, a potential difference can be caused by electrochemical processes (e.g., cells and batteries), the pressure-induced piezoelectric effect, and the thermoelectric effect.
A voltmeter can be used to measure the voltage between two points in a system. Often a common reference potential such as the ground of the system is used as one of the points. A voltage can represent either a source of energy or the loss, dissipation, or storage of energy.

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  1. Katherine Holland

    High voltage battery disconnected

    Apologies for another potentially silly question..... I had 3 young children asleep in the car today so I decided to sit with them on my drive for a few minutes to let them sleep. I left the air conditioning running as it was soooo hot outside. After only 4 or 5 minutes a yellow warning sign...
  2. J

    Loss of range and warning light 'please slow charge high voltage battery' coming on 4-5 times per day

    I have owned my MG EV since December 2020. Had no problems until this month. I am using at least 2k of battery to every 1 km travelled with no air con, heating on etc. I have had a total breakdown where every warning light was on and unable to move car after starting. Had to be towed to...
  3. M

    Voltage reading

    Hi could someone advise how to see the voltage reading after charging, so I can see if I need the latest BMS update? Thanks
  4. E

    Voltage

    Another one about battery voltage. Just watched the podcast re voltage. When fully charged and balanced mine reads 456 volts. I also noticed that the Chorley dealer stated that it should be 449 volts and that the latest software was introduced on January 18th. I collected my car on January 4th...
  5. Peter WA

    12V Battery - Charge Voltage

    Since I've got my OVMS up and running I get an overview of the voltage of the 12V battery over time. When the car is parked the voltage slowly drops, perhaps a little faster due to the OVMS itself and even faster since I've got a SIM installed and 3G is active. The 12V battery appears to get...
  6. johnnyallan

    Voltage

    I charged my car last night, it showed 176 miles, this morning I went to grimsby and back total 74 miles, I was left with Voltage 399 and 51miles, plus in eco mode 4mies per kilow, after it warmed up it went to 69miles, do I need a update, I have no way of checking the car, thankyou in advance.
  7. Johnny Trett

    New Car Voltage

    Have just picked up an MG5 Excite (10 days ago) and have noticed my HV battery voltage is only 405V , I believe should be around 450V, I leave it on charge over night but it is not changing (despite being 100%) what do I have to do to make it Balance (7kwh wall charger)???
  8. Stuart Wright

    Everything you need to know about BMS & voltage balancing

    Later today, @MilesperkWh and I are making a video to explain what BMS is and to address the concerns of ZS EV owners regarding potentially unbalanced batteries. I will ask Miles a series of questions to answer, the purpose being to create a definitive video on the subject which addresses all...
  9. Coady

    MG5 voltage reading

    What voltage reading should I expect after a full charge for MG 5? Mine shows highest 4.1, down to 3.7/3.8.
  10. Fishettibean

    Poll: Dec19->Jan21 BMS Voltage

    Please only vote on this poll if you had the old BMS which did not allow charging when unlocked (aka December19 BMS) and have recently has the new bms (from 18th January 2021, not before this date!). If you had an BMS update between August 2020 and 17 January 2021, you had an old version of BMS...
  11. E

    MG fully charged voltage

    My AS when fully charged reads 450 volts does this number suggest my MY needs the latest BMS upgrade? I got the car in November.
  12. M

    My Battery voltage

    I'm seeing comments that battery need to be 450V after full charge. my car 1 month old showing only 439V. Is it a concern . I also learned that there is an upcoming update to fix the range misleading issue that I have. Is it going to fix the voltage reading as well?
  13. V

    Low voltage battery low on charge.

    Hi, Had the comfort pack software update yesterday. Since the time I picked up the car, there is a warning for the 12V battery being low, to start the car. I thought if the car runs it will be ok (like with other cars). The car had done about 50 miles motorway now, but still the warning is...
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