m36

thingiverse

I needed a cheap Portable A/C power supply similar to the dewalt power station(which isnt cheap). I have milwuakee tools so i made one using 36 volt to 12 volt golf cart regulators. Assuming you already have milwuakee m18 drills/batteries you could print this and with <50 dollars in parts have a 12volt outlet capable of running a 120v inverter. I tested the run time and with a 120volt 120 watt load running off a cheap inverter it runs for about 1 hour exactly. WARNING . . . there is no under voltage protection in the current design and the batterys will run beyond there safe discharge level if left unattended. So be sure to remove a battery when not in use or when one of the gauges shows a low level. Build Instructions Smash the end of a piece of 14 gauge solid wire(romex) with a hammer against a smooth surface(cement floor) Leave enough wire to route through the paths to the outlet plug. Push the unsmashed wire into the wire channels in the base part with a flat blade screwdriver, or something similar. I used the uninsulated piece of wire from the romex for the jumper between the 2 batteries. Smash both ends of a piece long enough to fit before inserting into the wire channel. You can trim off the excess if there is too much exposed. Route all wires and make all connections before bolting the converters on. There isnt much space for wire connections in the dc outlet area in this version so soldering and heat shrink were used to make the connections. B.O.M. 1 12volt outlet (came in a 2 pack) one with a copper main post is highly recommended 3 10amp 36volt to 12volt converters (commonly used in golf carts) 2 Foot ? approximatly of romex 14/2 some bolts/screws (exact size isnt critical) Updates in progress Clean up 3d Model Add a handle and a means of attaching inverters Make the area where the outlet is larger for easier wiring and add some higher amperage connector option as the "lighter outlet" isnt meant for high amperage Note that pictures are of V1 and that V2 is as of yet untested Update 3-18-19 printed lower portion of v2 and the battery is far easier to insert and remove.