Yes, you can use an SSR. One of its advantages, when compared to a mechanical relay, is that it requires much lower current to hold in the ON state, typically around 20mA, whereas mechanical relays may require up to 1A or higher. This lower current requirement is especially beneficial in boats and RVs where power resources are limited. Additionally, SSRs have the advantage of not wearing out their contacts, producing no sparking, and operating quietly. The TL-SSR12100DCU SSR was specifically designed by Thornwave Labs for use in RVs, boats, and other vehicles equipped with a 12V electrical system. We also have SSRs for higher voltages.