Every week someone asks us for "an off-grid system" when what they want is a lower bill, and someone else asks for "just panels" in a neighbourhood where the lights go out twice a week. The three architectures — on-grid, hybrid, off-grid — solve different problems at very different prices. Here is the honest sorting guide.
The Three Architectures in One Minute
On-grid (grid-tied): panels and an inverter, no battery. Solar serves your loads while the sun shines; the grid covers everything else. Cheapest per kWp, fastest payback — and it shuts down during a blackout, by design.
Hybrid: panels, a hybrid inverter and a battery, with the grid still connected. Solar covers the day, the battery covers the evening and outages, the grid is backup of last resort. Costs more; does more.
Off-grid: no PLN at all. Panels sized for the worst month, a large battery bank, almost always a small generator as insurance. The most expensive way to make a kilowatt-hour — and the only way where the grid does not exist.
The Comparison That Matters
| On-Grid | Hybrid | Off-Grid | |
|---|---|---|---|
| Typical villa cost | IDR 65M (5 kWp) | IDR 95M (5 kWp + 10 kWh) | IDR 220M+ (10 kWp + 20 kWh + genset) |
| Works during blackout | No — shuts down | Yes — switches in <20 ms | There is no blackout |
| Payback focus | 4–6 years on bill savings | 5–7 years + outage immunity | Not payback — independence |
| Complexity / maintenance | Lowest | Moderate | Highest — you are the utility now |
Why On-Grid Systems Go Dark in a Blackout
The question we hear most. A grid-tied inverter must disconnect when the grid fails — a safety rule called anti-islanding that protects the PLN line crew working on the fault. Your panels can be bathed in sunshine while your fridge sits warm. This is not a defect; it is the architecture. If outage immunity matters to you, the battery is not optional — it is the product.
Who Should Choose What
On-grid: the bill killer
Right for stable-grid areas — Sanur, Denpasar, Nusa Dua — and for anyone whose only goal is cutting the PLN bill. It is the best pure investment of the three: every rupiah goes into production, none into storage. Our installation service and the maths in our payback article cover this case.
Hybrid: the Bali sweet spot
Right for the blackout belt — Canggu, Berawa, upper Jimbaran, and especially Uluwatu — and for anyone running a home office, medical equipment or a rental villa whose guests review their stay. You keep on-grid economics for the day and add a LiFePO4 bank that carries essentials through the evening and every outage. Two-thirds of what we install now is hybrid; details under off-grid & hybrid systems.
Off-grid: the last resort that became a lifestyle
Right in exactly two situations: PLN does not reach your land (jungle plots beyond Ubud, remote Bukit edges), or the available connection is so weak that building on it is pointless. Then off-grid is liberating — we design for the wettest month, two days of battery autonomy and a genset that runs twenty hours a year. But choosing off-grid while a healthy grid passes your gate means paying double for redundancy you will rarely use. We will tell you so.
The Upgrade Path Nobody Mentions
You do not have to decide everything today. A grid-tied system built on a hybrid-ready inverter (most Deye and recent Growatt models) accepts a battery later with no rewiring — start with the bill savings now, add outage immunity when the budget allows. The one decision that is hard to reverse is buying a non-expandable inverter to save two million rupiah. This is exactly the kind of trap a proper design and load calculation exists to prevent.
Our Honest Default Advice
Stable grid and tight budget: on-grid, sized from your bill. Blackout-prone area or anything critical at home: hybrid with 10 kWh of storage. No PLN on the land: off-grid, designed conservatively. And whichever you pick — the system should be sized from measured consumption, because the architecture only decides how the energy moves; the load decides how much of it you need.