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Viesti: <blockquote data-quote="upnorthandpersonal" data-source="post: 44654" data-attributes="member: 10225">By putting the MOSFETs in parallel, you lower the resistance and thus lower the losses and power dissipation in the BMS.You could do a calculation as follows (for e.g. a 200A JK BMS):Rds_on = 3.2mR typical at 25C per MOSFET. We have 10 pairs on the top and 10 pairs at the bottom for this 200A JK version. These are configured back to back, gives 6.4mR per pair at 25C. These 20 back to back pairs give a resistance of 6.4/20 = 0.32mR. Heating occurring at 200A continuous, P = R I^2 = 12.8W.So, instead of having to dissipate a huge amount of (wasted energy) heat with a large heat sink (which they technically could do), we only have to dissipate 12.8W or so at full 200A rated load. This means you typically don't need a huge heat sink, nor active cooling. In addition, it becomes very obvious with a temperature sensor when something is wrong, before it's too late.</blockquote>