Grid-Tied vs Off-Grid vs Hybrid Solar: Which System Type Fits?
Grid-tied solar is the cheapest per kWh because the utility acts as your battery. Hybrid is a grid-tied system plus battery backup — you keep the economics and add blackout protection. Off-grid means total independence, but you pay for it in batteries and an oversized array. Most homes with utility service want grid-tied or hybrid; off-grid is for properties where the grid isn't an option.
We sell the equipment for all three architectures every week, so we have no horse in this race — just the cost math and the failure modes. Here's how the three compare, with live pricing from our catalog on the actual hardware each one needs.
The Three Architectures at a Glance
| Grid-Tied | Hybrid | Off-Grid | |
|---|---|---|---|
| Relative cost | Lowest — no batteries | Middle — inverter + 10–30 kWh storage | Highest — big bank, oversized array, usually a generator |
| In a blackout | Shuts down (anti-islanding) | Islands the home; backup circuits stay on | Nothing changes — there is no grid |
| Batteries required | None | Yes — sized for essential loads | Yes — 2–3 days of autonomy |
| Grid connection | Required; exports via net metering | Required; can export or zero-export | None |
| Best for | Reliable grid + decent net metering | Outage-prone areas, weak export credits, TOU rates | Remote land where a utility line costs more than the system |
Prices are pulled live from the Pyra Solar catalog and refreshed hourly. Click any part to see current stock.
Grid-Tied: The Cheapest Solar You Can Own
A grid-tied system converts DC from your panels to AC and pushes it into your home's panel; anything you don't use flows out to the utility. Net metering in one line: your utility credits exported kWh against what you draw back at night — that credit is what makes battery-less solar pencil out, and its value varies a lot by state, so check your tariff before you buy anything. The catch is anti-islanding: under UL 1741 / IEEE 1547, a grid-tied inverter must shut down when the grid fails, so a plain grid-tied home goes dark in a blackout along with the neighborhood.
The equipment list is short — panels, racking, wire, disconnects, and one inverter decision: microinverters like the Enphase IQ8AC ($227.29 per panel, with per-panel monitoring and built-in rapid shutdown), or a string inverter like the Fronius Primo 10.0-1 ($2,699.25) that runs the whole array through one box for less money on simple, unshaded roofs. We break down the module-level-electronics question in Enphase vs SolarEdge.
Who it's for: homes with a reliable grid and reasonable export credits. If your power rarely blinks and your utility pays fairly for exports, batteries are a luxury, not a need — spend the savings on more panels.
Hybrid: Grid-Tied With a Backup Plan
A hybrid system is grid-tied economics plus a battery and the hardware to use it. When the grid drops, the hybrid inverter disconnects your home (islanding), then keeps your backed-up circuits running from solar and storage — the lights stay on while the grid-tied houses around you go dark. On time-of-use rates, the same battery earns its keep daily by shifting solar into expensive evening hours, and in states with weak export credits, storing your surplus beats selling it cheap.
Two ways to build it. DC-coupled: one 48V hybrid inverter like the EG4 FlexBOSS21 18k ($3,629.90) runs the panels and the battery bank together — Sol-Ark's 15K is the other big name in this class, and we compare them head-to-head in Sol-Ark vs EG4. AC-coupled: keep (or build) a standard grid-tied system and add a self-contained battery like the FranklinWH aPower 2 ($10,851.95, 13.6 kWh usable, 10 kW continuous) — or, on Enphase systems, IQ Batteries like the IQ Battery 5P ($3,615.94, 5 kWh). Browse the full battery storage collection for the bank options.
Who it's for: anyone in outage country (hurricanes, wildfire PSPS shutoffs, ice storms), anyone on time-of-use billing, and anyone whose utility pays poorly for exports. For most buyers weighing backup power, this is the answer.
Off-Grid: Independence at a Price
Off-grid means the array and battery bank are the whole power company. The inverter hardware is largely the same 48V hybrid class — a FlexBOSS21 or Sol-Ark runs off-grid happily — but the sizing philosophy flips. A hybrid bank covers an evening; an off-grid bank has to carry the house through 2–3 sunless days, and the array has to be sized for your worst month of winter sun, not your annual average. Most serious off-grid builds also keep a generator for the week of storms that beats any reasonable battery budget.
That's why the bank dominates the bill of materials. A home using 20 kWh/day wanting two days of autonomy needs roughly 40 kWh usable — about three units (~43 kWh nominal) of the EG4 280Ah Indoor LFP battery ($3,440.70 each, 280Ah at 51.2V nominal ≈ 14.3 kWh per unit) before you've bought a single panel. The full four-step math — daily load, autonomy, inverter surge, worst-month array — is in our off-grid sizing guide.
Who it's for: remote cabins, ranches, and new builds where the utility quotes five figures to run a line. If a $30,000 line extension is the alternative, off-grid wins. If the grid already touches your house, it almost never does — hybrid gives you the independence feeling at a fraction of the cost.
Which One Fits? The Short Decision List
- Reliable grid, decent net metering, tight budget: grid-tied. Lowest cost per kWh, simplest permit, fastest payback.
- Outages more than once or twice a year, or weak export credits: hybrid. Start with 10–15 kWh of storage for essentials; the bank can grow later.
- Medical equipment, well pump, or work-from-home that can't lose power: hybrid, sized around those specific circuits.
- No utility service, or a line extension quote that made you laugh: off-grid, with a generator in the plan from day one.
- Grid-tied today, nervous about tomorrow: build grid-tied with a hybrid-ready or AC-coupled path so batteries bolt on later without redoing the system.
One permitting note: all three architectures still go through your local building department, and grid-connected systems also need utility interconnection approval. Requirements like rapid shutdown apply to rooftop arrays under the 2020 NEC regardless of architecture — verify specifics with your AHJ before ordering.
Frequently Asked Questions
Is off-grid solar cheaper than grid-tied?›
No — it is usually the most expensive option per kWh delivered. Grid-tied uses the utility as free storage, so you buy no batteries. Off-grid must carry the house through nights and cloudy stretches, which typically means 2–3 days of battery autonomy plus an oversized array and often a backup generator. The battery bank alone frequently costs more than an entire grid-tied system.
Do grid-tied solar panels work during a power outage?›
No. Standard grid-tied inverters are required to shut down when the grid goes down (anti-islanding, per UL 1741 / IEEE 1547) so they can't back-feed lines that utility crews are working on. If you want power during an outage, you need a hybrid inverter or AC-coupled battery system with islanding hardware that disconnects your home from the grid before energizing it.
Can I convert a grid-tied system to hybrid later?›
Yes, and it's a common upgrade path. The cleanest route is AC-coupled storage — an all-in-one unit like the FranklinWH aPower 2, or Enphase IQ Batteries on an Enphase microinverter system — added alongside your existing inverter. The alternative is replacing your string inverter with a hybrid model like the EG4 FlexBOSS21 or a Sol-Ark and DC-coupling batteries to it.
What is the difference between a hybrid inverter and an off-grid inverter?›
Mostly software and certification, not hardware. Modern 48V hybrid inverters (Sol-Ark, EG4 FlexBOSS21, and similar) can run grid-tied with export, grid-tied zero-export, or fully off-grid. A true off-grid installation simply never uses the grid input — the same inverter class does both jobs, which is why off-grid builds today usually spec a hybrid inverter.
How many batteries do I need for hybrid vs off-grid?›
A hybrid system backing up essential circuits typically runs 10–30 kWh — one or two wall units. An off-grid home needs enough usable capacity to cover roughly 2–3 days of consumption with no sun; for a home using 20 kWh/day that's 40–60 kWh of storage, which is three to four times the typical hybrid bank.
Which system type do most homes actually choose?›
Grid-tied and hybrid cover the overwhelming majority of homes with utility service. Straight grid-tied wins where the grid is reliable and net metering pays well; hybrid wins where outages are common or export credits are weak. Off-grid is chosen when running a utility line is impossible or costs more than the system itself.
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