Hello Steve,
A few questions;
- When you say 'the BMS flickering On-off' what do you mean? Does the
BMS complete turns off, and that shuts your power train off as well?
- What kind of drive train system are you using and what voltage?
By putting capacitors between the your pack + or - to 'Chassis' you are
just increasing the capacitance for the internal BMS isolation circuit,
Most internal isolation fault circuitries from BMS's use to connect, for
fractions of a second;a very high value resitor with the (+) side and
performs a leak test. Then disconnects and then connects to the (-) side to
perform same leak test as well. The process continues all the time.
Puting those capacitors and increasing the uF rate will only delay that
fault test, maybe up to a point that your BMS no longer will be able to
check for islolation faults.
Regards...
Marco Gaxiola
On Wed, Aug 1, 2018 at 4:38 PM Steve Clunn via EV <[email protected]> wrote:
> I'm having some problems with a conversion with 7 Tesla modules 42 cells.
> When giving the car a little go pedal the BMS starts to flicker off and on
> even though the cell voltage is not dipping. I put some .47 UF capacitors
> between the frame and the battery packs at different points. Some seem to
> help but I'm still got one BMS that is triggering on its own. Done the wire
> moving around so they're not near the cables but that didn't seem to help
> much. I'm wondering if I'm using two larger capacitor what is the rule of
> thumb for the size of capacitors to get rid of noise on these lines. Any
> help would be appreciated. Steve clunn
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