After the success of printing the sledge for my DIY ROV in the last post, It is now time to try and wire it up, I am using two of these Youmile 3S Battery Protection Board Modules, they claim to be capable of managing 10A, which I feel is pushing the truth somewhat, however as a BMS (Battery Management System) they should be ok, at protecting my cells from being overcharged, over-discharge and excess current being requested.
I am using two banks of 21700s in a 2P3S configuration, each of the banks has its own BMS. 21700s are slightly larger than the more common 18650s and are available in capacities between 4-5 Ah (4000-5000 mAh), 18650s generally are between 2.3 to 3.6 Ah (2300-3600 mAh), the cells I am using are about 4 Ah, so my 2x 2P3S packs will be about 16 Ah, with a nominal voltage of 11.1 V, (Fully Charged Voltage 12.6 and 25% SoC at 11.24 V). The Wh of the pack is about 180 Wh
So starting with the sledge that I printed recently from Filamentive grey filament, it was time to bend up the battery terminals and glue the with a dab of CA onto the battery caps, solder them together with some 1mm^2 CSA brass rod and then put the four tails on them:
Once that was all wired up it was time to mount the two packs on the sledge, I have wired it up temporarily using Wago style connectors.
I will get the packs charged, then see what I can do next.
