Solar Accessories

Off Grid Solar Accessories — Charge Controllers, Transfer Switches & More
The best off grid solar accessories connect your panels, batteries, and loads into a reliable power system. This category covers MPPT charge controllers, auto transfer switches, system monitors, and balance-of-system components from EcoFlow, Victron Energy, Tigo, and EG4 — the brands serious off-grid installers specify.
The EcoFlow Smart Home Panel 3 ($2,632) is the flagship solar accessories purchase for residential off-grid retrofits: 32-circuit control, automatic transfer from grid to solar within 30ms, and native EcoFlow app integration for load monitoring. The Tigo 200A MCB Auto Transfer Switch ($2,299) handles the same grid/off-grid switching function in commercial installations where Tigo modular architecture is already deployed. For MPPT charge controllers: the Victron Energy SmartSolar MPPT RS 450 100/200 ($973) handles high-voltage string arrays up to 450V — the right spec for systems beyond 3kW of panel capacity.
Off grid solar accessories buying guide — what you need by system size: Under 1kW → basic MPPT controller + manual bypass. 1–5kW → SmartSolar MPPT + transfer switch + system monitor. 5kW+ → RS 450 MPPT + smart transfer panel + battery management. The EG4 Chargeverter Plus ($568) solves a specific off-grid bottleneck — AC-to-DC charging from a generator at up to 3,600W when solar yield drops during cloudy seasons. All components ship with full manufacturer warranty and US-based tech support.