Ninebot max huge voltage drop and error 21 while accelerating

Olivierftw
Posts: 10
Joined: Wed Jul 15, 2020 4:34 pm

Ninebot max huge voltage drop and error 21 while accelerating

Postby Olivierftw Tue May 18, 2021 10:40 pm

hello,

i have a g30 max,

when i accelerate with full throttle error 21 pops up when i release throttle the error dissapears and
my battery percentage drops from take 60-70% to 10-15%.
before i ran a 48V setup with an external 12V battery.
i bypassed my stock battery bms and ran a cfw for 48v.
a while ago ive removed the external battery and flashed a regular 36V cfw.
at first i didnt have any issues.
now since a couple of weeks ive been getting this huge voltage drops.
i tought maybe the 36v cfw was to aggresive and flashed stock firmware but without any result.
the voltage keeps dropping.
did i kill my stock bms? when i read battery stats on ninebot iap everything seems fine.
i still have the series wiring to add the 12v external but with a jumper plug connected.

anyone have an idea what could be wrong?

grtz
Benito64
Posts: 1
Joined: Wed May 19, 2021 4:13 pm

Re: Ninebot max huge voltage drop and error 21 while accelerating

Postby Benito64 Wed May 19, 2021 6:17 pm

J'ai eu le même problème avec ma batterie 3s7p,en série. Je pensais avoir cramé mon esc ou bms de la batterie (fil marron fondu quand même) . Au final, j'ai réussi sans rien changer à relancer la machine. D'une tu ne dois jamais juste débrancher ton batterie 12v niveau du Y, tu dois bien rebrancher en direct, de 2 avec le y le b+ doit être brancher avec le plus du esc.. Donc d'abord la batterie 36v en série avec la 12v,le- qui repart à l'esc.
Puis surtout dans le cfw tu dois choisir level 3 '' do not raise error''

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