Sure, but keep the scope tight. Grab a 12‑volt sealed lead‑acid battery or a Li‑Po pack with a built‑in BMS. Use a 12‑volt, 10‑amp fuse at the positive rail. Wire a 10‑amp relay between the charger and the battery; that way you can shut off the charger when the battery’s full. For the solar, a 20‑W panel is enough—connect its positive to a DC‑DC buck converter set to 12V, feed that into the same relay circuit. Make sure all grounds share a single bus; twisted pair cable reduces noise. Label each wire—black for ground, red for positive. Strip and tin the ends, use heat‑shrink for protection. If you skip any step, the pack will be a mess. Got a cable diagram? That’ll save me from having to redraw the whole thing.