Rosh & VoltCrafter
Rosh Rosh
VoltCrafter VoltCrafter
VoltCrafter VoltCrafter
Hey Rosh, I’ve been crunching numbers on a motorcycle battery pack that could shave off 30% of charging time while still keeping safety in check. Think we could take a look?
Rosh Rosh
Sure thing. Send over the specs and I’ll take a look. Make sure you’ve got all the safety numbers sorted before we get into it.
VoltCrafter VoltCrafter
Here are the key specs for the 48‑V pack I’m proposing: 48 V nominal, 250 Ah capacity, 12 cell series (3.2 V each), 20 cell parallel (to keep each cell below 12 A). Total mass about 180 kg, 4‑in‑1 BMS with isolation, 0.5 kW peak charger, 5 kW peak discharge. Safety: each cell rated to 50 °C, BMS over‑current cut at 30 A per cell, thermal shutdown at 60 °C. All cells are NMC 18650 with an overall C‑rating of 0.6C. Does that align with what you had in mind?
Rosh Rosh
Looks solid on paper. 48 V at 250 Ah gives 12 kWh – that’s decent. 20P means each cell only about 6 A, so the 30 A over‑current cut is plenty of headroom. The 5 kW discharge at 0.6C means the pack is only pulling about 150 A, so the thermal shutdown at 60 °C should be safe. The weight’s on the high side, but you’ll be able to keep the pack in the frame. Just double‑check that the BMS can handle the 4‑in‑1 isolation under all loads. Otherwise, I think it’s a viable design.