Auxiliary Battery

I bought a PowerSonic deep cycle (28ah) motorcycle battery for my auxillary battery. The battery will be wired in series between the dc-dc converter and the car fuse box to power the 12 volt system. The dc-dc converter will also keep the battery charged from the main battery pack. The battery will mount in the front battery rack. There's just enough space to slide it in.

Laying out the Components on the Electronics Board

I started laying out the components on the board. Initially I wanted to have the controller oriented with the terminals facing outwards so they hung out over the edge on the driver side. I thought it would be better for connecting the cables having not go through the plastic board. However the controller adjustment screws are on the other side and I wanted that to face outward. So the terminals will face inward as shown in the picture below.

I think the dc-dc converter will go on the right, closest to the auxiliary battery.