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CP duty cycle calibration/offset #64

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demerstraat opened this issue May 2, 2024 · 2 comments
Closed

CP duty cycle calibration/offset #64

demerstraat opened this issue May 2, 2024 · 2 comments

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@demerstraat
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Describe the bug

noticing consistent 5-6% offset between "CP current setpoint" as sent by EVSE via CP vs. actual current drawn by EV OBC.
e.g. setpoint to charge = 16A, actual current drawn = 15.3A.

the same offset is present whether in SOLAR / SMART / NORMAL mode

also noticed that "MAINS L1" seems to be within 0.1A of "SET CURRENT".
is it possible that PWM correction is evaluated against "MAINS L1" instead of against "EV L1" ?

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raw.json

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To Reproduce
see above: always present

Expected behavior
actual current drawn by EV ~ EVSE current setpoint

Screenshots
image
@dingo35
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dingo35 commented May 2, 2024

Most EV's draw only 95% of the allowed current.

https://gathering.tweakers.net/forum/list_message/77537224#77537224

@dingo35 dingo35 closed this as completed May 2, 2024
demerstraat added a commit to demerstraat/SmartEVSE-3.5 that referenced this issue May 20, 2024
@demerstraat
Update evse.cpp
31341bb 
was able to get accurate current draw with this offset

please see :
dingo35#64
@demerstraat
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demerstraat commented May 20, 2024 •
edited
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image
offset of "10" in PMW duty did the trick to get 100% of "set value"
made commit

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2 participants
@dingo35 @demerstraat