We show all the details on how to install it, along with all the parts needed for a stateoftheart dual battery system that's affordable and easy to install. By doing the install on your own and saving money where you can, you can have a super reliable power source for your automotive fridge, camping lights, whatever makes your overlanding experience pleasurable.
In the video we show the cost of the materials, (as of 3/13/2021), as well as provide links to them below. The overland power system we show costs less than a typical dual battery kit.
The DCDC charger we use is a CTEK D250SE. In the video we show how to make all the wire connections and how we mounted it. We also explain why a dcdc charger is best for charging an AGM battery like our Optima DH6 Yellow Top.
We installed ours in a Toyota FJ Cruiser, but this DIY auxiliary battery system can be adapted to fit just about any SUV, Jeep, Subaru, or pickup truck.

Here are the battery terminals: https://sdhqoffroad.com/products/sdhq...

Here are the Amazon Affiliate links to the vast majority of the parts we used in the install:
CTEK D250SE, Dual Input, 20A, DCDC Charger: https://amzn.to/2NdVJvu
Optima DH6 YellowTop Dual Purpose Sealed AGM Battery: https://amzn.to/3qO5w9k
Inexpensive, Universal Battery Tray: https://amzn.to/3voTbfd
Inline Fuses, 10awg, Three Pack: https://amzn.to/2OOgsXd
10awg Wire, Black & Red, 10' Long: https://amzn.to/3tlNQnj
Thermal Circuit Breaker, 30 amp: https://amzn.to/2Os8F1v
Thermal Circuit Breaker, 40 amp: https://amzn.to/2Q4ucxT
Braided Wire Sleeving, 3/8" x 25': https://amzn.to/3voF7Co
Plugin & wire for solar panel connection, 10awg, SAE: https://amzn.to/3bISx4w