Bay Marine Supply is a San Diego specialty electronics distributor in Grantville, stocking inverters, lithium batteries, battery chargers, and solar-panel kits for boats, RVs, and off-grid installations from a warehouse on Fairmount Avenue. The company launched in 2011 and holds national distribution agreements with Victron Energy and Sterling Power, plus authorized dealer status for Blue Sea Systems, FTZ Industries, and Battle Born Batteries — a vendor roster that covers 12-volt and 24-volt DC power systems from panel to battery bank. Aquatic electrical components including bilge pumps, marine-grade wiring harnesses, and waterproof bus bars overlap with the filtration and pump hardware stocked at LLLReptile & Supply Mission Valley down the corridor, though Bay Marine's catalog is built around shore-power inverters, MPPT charge controllers, and lithium iron phosphate battery banks rated for marine duty cycles. The 92120 warehouse ships same-day on in-stock orders and offers freight-free delivery on purchases over eighty-five dollars to addresses in the lower forty-eight states, serving wholesale accounts and individual boat owners nationwide. RV and service-vehicle owners use the same Victron MultiPlus inverter/charger units and Sterling Power battery-to-battery chargers that the marine side of the catalog carries, making the Fairmount Avenue location a crossover parts source for overlanders, mobile-service fleets, and van-conversion builders. The detailing and exterior-care circuit along the Grantville corridor, including Gleam Auto Spa, serves the same RV and vehicle clientele that installs Bay Marine's electrical upgrades under the hood and on the roof rack. Technical staff sizes each system to the load profile — calculating amp-hour capacity, charge-rate limits, and inverter surge ratings before specifying components — and supports all hardware purchased through the shop with post-install troubleshooting over the phone.