{"id":1988,"date":"2023-02-08T11:27:13","date_gmt":"2023-02-08T03:27:13","guid":{"rendered":"https:\/\/www.leafmotor.com\/blog\/?p=1988"},"modified":"2023-02-08T11:27:13","modified_gmt":"2023-02-08T03:27:13","slug":"motor-controller-cut-off-voltage","status":"publish","type":"post","link":"https:\/\/www.leafmotor.com\/blog\/motor-controller-cut-off-voltage\/","title":{"rendered":"motor controller cut off voltage"},"content":{"rendered":"

Each motor controller<\/a> has min cut off voltage and max working voltage.<\/p>\n

For example:
\n48v Controller’s cut off at 40v. Less than 40v, not work.
\n36v Controller’s cut off at 30v. Less than 30v, not work.<\/p>\n

For 48v electric bike motor kit<\/a> system.We recommend reach set cut off voltage to over 42v by LCD. Less than 42v,should charge battery. It’s good for battery. <\/p>\n

These days,all kinds of lithium batteries was made by 13 series connection or 14 series connection cells to be 48v, 52v.<\/p>\n

Each cell – min about 2.8v , max about 4.2v
\n13 series – 4.2v x 13 = 54.6v
\n14 series – 4.2v x 14 = 58.8v<\/p>\n

Overdischarge and overcharge both Not good for battery.
\nFor example: if set it to 40v (controller’s cut off voltage is 40v)<\/p>\n

2.8 x 14 = 39.2v (about 40v)<\/p>\n

If 14 series connection cells ‘s min voltage to be 2.8v at the same time. That’s good.<\/p>\n

But ride half a year, cut off voltage still 40v.
\nIf No. one cell ‘s min voltage is 2.7v, second is 2.9v, third cell is 2.9v….
\nTotal voltage is 40.4v ( 2.9 x 13 + 2.7v)<\/p>\n

If first cell’s voltage to be 2.7v, it’s overdischarge, battery can’t to be charged. Battery is broken.
\nSo we recommend charge battery when it reach about 42v or over.<\/p>\n

If min 42v
\nNo. one cell ‘s min voltage is 2.9v, second is 3.0v, third cell is 3.0v….
\nTotal voltage is 41.9 v ( 3.0 x 13 + 2.9v)<\/p>\n

New battery doesn’t have this issue. If ride 1-2 month, we recommend charge battery @ 42v or over.<\/p>\n

For example: cell phone, only leave 20%,need to charge. If use out all that will break cells, also very hard to charge. <\/p>\n

So we recommend set cut off voltage by LCD that over controller’s cut off voltage.<\/p>\n","protected":false},"excerpt":{"rendered":"

Each motor controller has min cut off voltage and max working voltage. For example: 48v Controller’s cut off at 40v. Less than 40v, not work. 36v Controller’s cut off at 30v. Less than 30v, not work. For 48v electric bike …<\/p>\n

Read more »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75],"tags":[48,5],"class_list":["post-1988","post","type-post","status-publish","format-standard","hentry","category-bike-motor-controller","tag-bike-motor-kit","tag-motor-controller"],"_links":{"self":[{"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/posts\/1988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/comments?post=1988"}],"version-history":[{"count":1,"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/posts\/1988\/revisions"}],"predecessor-version":[{"id":1989,"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/posts\/1988\/revisions\/1989"}],"wp:attachment":[{"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/media?parent=1988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/categories?post=1988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.leafmotor.com\/blog\/wp-json\/wp\/v2\/tags?post=1988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}