Shop for solar in Jamaica and you will hear three terms thrown around: grid-tie, hybrid and off-grid. They sound technical, but the difference really comes down to one question: what happens when the power goes out. Get that straight and the rest falls into place. Here is the plain version.
Grid-tie: the simplest, and the one that surprises people
A grid-tie system is just panels and an inverter, no battery. The panels make power, the inverter turns it into the kind your house uses, you run on it during the day, and any surplus goes to the grid for a net billing credit. It is the cheapest and simplest setup, and it cuts your bill.
Here is the part that catches people out. When JPS goes down, a grid-tie system shuts off too, even in bright sunshine. That is not a fault, it is a required safety feature called anti-islanding: the system must stop feeding power so it cannot electrocute a lineman working to restore the supply. The result is that a plain grid-tie system gives you no backup at all. If the only thing you want is a smaller bill and your supply is fairly steady, grid-tie is fine. If you went solar partly to ride out the outages, it will disappoint you.
Hybrid: solar plus a battery, and the sweet spot here
A hybrid system is a grid-tie system with a battery added and a smarter inverter running the show. Through the day the panels power the house and charge the battery. When the grid drops, the system switches over to the battery almost instantly and keeps your essentials running, while the grid-tie part still earns you credits when you have surplus. You get the bill savings and the backup.
It costs more than plain grid-tie and the install is more involved, but in Jamaica, where the power goes as often as it does, hybrid is what most homes actually want. It is the honest answer for anyone who says they want solar “so the lights stay on.” How big a battery you need comes down to what you want to keep running, which is the heart of battery backup sizing.
Off-grid: no utility at all
An off-grid system has no connection to JPS. The panels and a battery bank carry the whole property, often with a generator as a backstop for long cloudy stretches. Because nothing comes from the grid, the system has to be sized for your full load with margin, which makes it the biggest and most expensive of the three.
Off-grid makes sense in one main situation: when the grid does not reach you, or reaching it would cost a fortune, like a remote property up a mountain or deep in the country. For most homes with a perfectly good JPS connection at the road, off-grid is overkill, and hybrid gives you the independence you actually want for less.
Which one is right for you
It comes down to what you are trying to get. If you only want to cut the bill and your supply is steady enough, grid-tie does it cheapest. If you want savings and you want to stay on through the outages, which is most people here, hybrid is the one. If you are somewhere the grid does not properly reach, off-grid is the answer. The money question, across all three, is worked through in is solar worth it in Jamaica right now?, and how the credits work is covered in how JPS net billing actually works.
One safety note that matters here: never try to rig a generator or solar to back-feed your house without a proper transfer switch or interlock. Back-feeding the grid is dangerous to line workers and against the rules. You can read about the safety principle behind it under islanding.
Doing it to standard
Whichever type you choose, grid-tied and hybrid solar must be done to standard and pass a Government Electrical Inspectorate inspection before the supply is connected. The wiring, the inverter setup and the protection all have to be right, both to pass that check and to keep your home and the people on the line safe.
What we do here
We design and install all three, grid-tie, hybrid and off-grid, and more often than not we steer Jamaican homes toward hybrid, because backup is usually the real goal. The first step is always a look at the property and a real quote, built around your usage and what you want to keep running when the grid goes.
Related reading
- Is solar worth it in Jamaica right now? for whether the numbers work for you.
- How JPS net billing actually works for what you earn on the power you send back.
- Battery backup sizing: keeping the essentials on through an outage for sizing the battery in a hybrid or off-grid system.
- Solar installation for designing the right system for your home.
What is the difference between grid-tie, hybrid and off-grid solar?
It comes down to what happens in an outage. Grid-tie has no battery and shuts off when the grid goes down, so it only cuts your bill. Hybrid adds a battery and keeps your essentials running through a cut while still saving on the bill. Off-grid has no grid connection at all and runs the whole property on solar and batteries.
Why does my grid-tie solar shut off during a power cut?
Because of a required safety feature called anti-islanding. When JPS goes down, a grid-tie system must stop feeding power so it cannot electrocute a lineman working to restore the supply. That is why a plain grid-tie system gives no backup, even in bright sun. To stay on through an outage you need a battery, which means a hybrid or off-grid setup.
Which solar system is best for Jamaica?
For most homes, hybrid. Because the power goes often here, people usually want both a smaller bill and backup through outages, and only a battery-backed system delivers that. Grid-tie suits those who only want bill savings with a steady supply, and off-grid suits remote properties the grid does not properly reach.
Is off-grid solar a good idea if I already have JPS?
Usually not. Off-grid means sizing for your entire load with batteries and often a generator, which makes it the most expensive option. If you have a good JPS connection at the road, a hybrid system gives you the independence and backup you actually want for less. Off-grid makes sense mainly where the grid does not reach.
Does a hybrid system still earn net billing credits?
Yes. A hybrid system is grid-connected, so when your panels produce more than the house and battery need, the surplus goes to the grid for a net billing credit, just like grid-tie. The battery simply lets you store your own power for the evening and ride through outages, instead of losing power the moment the grid drops.
Does solar need inspection in Jamaica?
Yes. Grid-tied and hybrid solar must be done to standard and pass a Government Electrical Inspectorate inspection before the supply is connected. The wiring, inverter setup and protection all have to be correct, both to pass that check and to keep your home and the workers on the line safe.
The next step
Grid-tie, hybrid or off-grid, the right choice depends on whether you want bill savings, backup, or full independence, and on your property. Get a free quote or message us with a recent bill and what you want from solar, and we will design the system that fits.