Sorry, new to the forum and wasn't sure how to title this post.
I have completed a small frame Vespa electric conversion and built an 18S8P battery using Samsung 30Q cells with a 100A BMS that was supplied to me. I'm wondering if I should change the BMS for something that could offer me more control.
Here's the issue I'm facing. Fully charged the battery will measure at 75.6V or 4.2V per cell which is perfect. Once I discharge the battery down to ~35% charge remaining my Vespa starts to lose power. I can still maintain 50Km/h on the flats but as soon as I encounter any sort of hill it really struggles. At this 35% charged state the battery still measures ~64V or 3.55V per cell. I'm wondering if my BMS is being overly conservative with its low discharge voltage protection. I would have thought that I could safely take these cells down to 3.2V or even below? At the moment I'm getting about 32Km of range before the loss of power. If I could take the cells a bit further safely that could give me up to 40km of range that would make my commute so much less stressful.
Do you think it could be my BMS? If so, does anyone have a suggestion for a quality BMS that might allow me to configure the low voltage protection to get a bit more range from the battery pack without doing damage.
I have completed a small frame Vespa electric conversion and built an 18S8P battery using Samsung 30Q cells with a 100A BMS that was supplied to me. I'm wondering if I should change the BMS for something that could offer me more control.
Here's the issue I'm facing. Fully charged the battery will measure at 75.6V or 4.2V per cell which is perfect. Once I discharge the battery down to ~35% charge remaining my Vespa starts to lose power. I can still maintain 50Km/h on the flats but as soon as I encounter any sort of hill it really struggles. At this 35% charged state the battery still measures ~64V or 3.55V per cell. I'm wondering if my BMS is being overly conservative with its low discharge voltage protection. I would have thought that I could safely take these cells down to 3.2V or even below? At the moment I'm getting about 32Km of range before the loss of power. If I could take the cells a bit further safely that could give me up to 40km of range that would make my commute so much less stressful.
Do you think it could be my BMS? If so, does anyone have a suggestion for a quality BMS that might allow me to configure the low voltage protection to get a bit more range from the battery pack without doing damage.