SylvainTrial Posted July 28, 2023 Report Share Posted July 28, 2023 (edited) Hello guys, I created a 15aH LifePo4 Battery for the OSET of my son. At equivalent capacity, 10aH, the Lifepo4 will give better autonomy than the original lead batteries because the efficiency is much higher (95% against 60%)... I chose LifePo4 cells because they are safer than Li-ion (no risk of explosion or fire). Now my son can run x3 time longer and we won 8kg on the bike ! Please find in the attached file the full procedure if you want to create your own too. I put all the link to buy the components. Then all the setting for the BMS are explained in the attached file too. I chose this ELERIX brand because it fits into the bike once assembled, but also because we have the guarantee of the quality of the cell. When you buy from China, there is a lot of chance of buying cells that are already used and with less efficiency (it should be Grade A). Hope this could help you Sylvain. Construire une batterie LifePo4 pour sa OSET 20 (english).pdf Edited July 28, 2023 by SylvainTrial mistake between no and now 1 2 Quote Link to comment Share on other sites More sharing options...
charlie chitlins Posted September 14 Report Share Posted September 14 No comments here? This is great information. Thank you!! Quote Link to comment Share on other sites More sharing options...
OSETchris Posted November 13 Report Share Posted November 13 Hi, Thanks for this informations!! So, maybe i understood somesthing wrong. The Cells have a current of 3C means 35A. But the oset wants Up to 130A? I am not sure if this is save.... Sorry for my worse English ... Greets Christian Quote Link to comment Share on other sites More sharing options...
lemur Posted November 13 Report Share Posted November 13 Oset 20 motor spec is 1200 watts at 48 volts watts = amps x volts amps = watts / volts 1200/48 = 25 your 1200 watt Oset 20 motor draws a maximum 25 amps @ 48 volts Quote Link to comment Share on other sites More sharing options...
OSETchris Posted November 13 Report Share Posted November 13 Ok, But why do we need then a 100A BMS? The Oset RB5S is rated at 60A. Im cofused. Could it be, that the Motor is nominal rated at 1200w but has a much higher Peak power? Quote Link to comment Share on other sites More sharing options...
lemur Posted November 13 Report Share Posted November 13 4 hours ago, OSETchris said: ... Could it be, that the Motor is nominal rated at 1200w but has a much higher Peak power? Motor should not draw more then the 1200 watts or there is a problem. I have one of the smaller ones and that's what made me notice the 130 amps, amperage numbers like that is the battery reserve capacity. It's a value based on the time the battery can run before voltage drops to unusable (differs for lead acid or lithium) lithium holds voltage longer and then drops faster compared to a lead acid battery Quote Link to comment Share on other sites More sharing options...
lemur Posted November 13 Report Share Posted November 13 Lithium batteries don't perform well in cold climates which is one reason why they don't rate them in CCA cold cranking amps, the battery RC spec is under optimum test conditions. Quote Link to comment Share on other sites More sharing options...
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