Ryobi Dual Battery DC to AC inverter

thingiverse

Wanted to make a portable Inverter for camping trips, and already use a ton of Ryobi One Plus devices (lights, radio etc.) when camping. So i remixed this existing dual battery mount. Leaf spring contacts work perfectly as described in the source build. The battery contacts are set up in parallel for the added amperage. cannibalized a 150watt auto inverter, and soldered on a 24v to 12v dc step down transformer. For some added heat dissipation 2 fans were added. Leaf Spring Battery contacts https://www.amazon.com/gp/product/B06VTPWM6M/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1 Step down transformer https://www.amazon.com/gp/product/B00BWKXTUU/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1 5v DC fans https://www.amazon.com/gp/product/B01M16KDEG/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1 Cheap 12v inverter https://www.amazon.com/gp/product/B01H2XD2DY/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1 First, I epoxied the the individual battery channels to the top battery mounts soldered leaf spring battery contacts to 14gauge wire in a parallel setup (since I wanted to double the amperage of the individual batteries) added a rocker on/off switch to prevent parasitic draw when not in use. connected the parallel wiring to the input of the step-down transformer (the transformer is fairly efficient, so not much is lost/waste) Disassembled the 12v inverter to find existing 5v rail to power fans (usb was the easiest find) added a rocker switch for the addition fans (i think ill replace with a thermister in the future to automate the fans when necessary) Soldered 12v constant output from the step down transformer to the 12v inverter input contacts can attach pictures if necessary to assist In the future, i'm thinking about adding a dedicated high output USB3/USBC charger to maximize quick charging capabilities, and maybe check and see what Ryobi's new 9ah batteries can handle