Ryobi Dual Battery DC to AC inverter

thingiverse

Wanted to create a portable Inverter for camping trips using my existing Ryobi One Plus devices. I already use these devices extensively when camping, so I decided to remix this dual battery mount design. Leaf spring contacts work perfectly as described in the source build. The battery contacts are set up in parallel to increase amperage output. I cannibalized a 150-watt auto inverter and soldered on a 24V to 12V DC step-down transformer. Two fans were added for heat dissipation. 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 individual battery channels to the top battery mounts. Soldered leaf spring battery contacts to 14-gauge 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 or wasted. Disassembled the 12V inverter to find the existing 5V rail to power fans (the USB was the easiest option). Added a rocker switch for the additional fans; I think I'll replace it with a thermistor in the future to automate fan operation when necessary. Soldered the 12V constant output from the step-down transformer to the 12V inverter input contacts. You can attach pictures if necessary to assist. In the future, I'm thinking about adding a dedicated high-output USB 3/USBC charger to maximize quick charging capabilities and checking out what Ryobi's new 9Ah batteries can handle.