On-Grid, Hybrid, or Off-Grid: Choosing the Right Solar System Type
Solar installers will often default to whichever system type they sell most of, which isn't always the type that fits your actual problem. The three options solve genuinely different needs.
On-grid (grid-tied, no battery)
An on-grid system generates power during daylight, uses it for your load in real time, and exports any surplus to the grid — earning net billing credit (see our net billing explainer) for that surplus rather than storing it. It's the cheapest system type per installed kW, since there's no battery cost, but it gives you zero backup during a grid outage — when the grid goes down, an on-grid inverter shuts off too, for safety reasons (it can't be exporting power into a line utility workers might be repairing).
This makes sense if your priority is purely reducing your electricity bill and you either don't experience load-shedding or already have a separate backup solution (a generator, or an existing UPS).
Hybrid (grid-tied with battery)
A hybrid system adds a battery bank, so it can store daytime surplus generation and discharge it during an outage or after dark. It costs more upfront than on-grid (see the added cost per watt in our solar payback calculator) but solves the loadshedding problem that on-grid can't, while still staying connected to the grid and net-billing any true surplus.
This is the right choice for most households in areas with meaningful loadshedding who want both lower bills and backup power, without going fully off the grid.
Off-grid (no grid connection)
An off-grid system has no connection to the DISCO at all — every watt you use has to come from your panels or battery bank. It requires significantly more battery capacity (sized for your worst-case cloudy stretch, not just overnight) and typically a backup generator for extended low-generation periods. This only makes sense for genuinely remote sites with no practical grid connection, or for someone specifically choosing to disconnect entirely — for almost everyone else, it's more expensive and less resilient than a well-sized hybrid system.
Sizing whichever type you choose
Regardless of system type, the sizing math is the same starting point: your consumption, your city's peak sun hours, and your roof area. Our solar system size calculator handles all three system types, including battery sizing for hybrid and off-grid based on your desired backup duration and essential load.
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