A hybrid inverter is the box that turns the DC electricity from your solar panels into AC electricity for your home, and also charges and discharges a battery. If you want a battery now, or might add one later, it’s usually the inverter installers recommend. SEAI’s homeowner guide puts it simply: if you are installing a battery, or plan to in future, you will need a hybrid inverter (SEAI). This post explains hybrid inverters for Irish homes, how they compare with string inverters and microinverters, and how inverter size fits within ESB Networks’ NC6 limit. Checked 26 October 2026.
Hybrid inverter explained: what it does in an Irish home
Every grid-connected solar system needs an inverter. A hybrid inverter adds battery management to the normal job, so one unit can:
- Convert panel output to AC for your appliances
- Send surplus solar into a battery instead of exporting it
- Discharge the battery in the evening, and in some setups charge it on a cheap night rate
- Export what’s left to the grid, which your supplier pays for under the Clean Export Guarantee
- With the right switching equipment, supply backup power in an outage
A plain string inverter does only the first and fourth jobs. You can still add a battery later with a separate AC-coupled battery inverter, but buying a hybrid at the start usually avoids that extra box. Our system options page shows how the pieces fit together.
Hybrid vs string vs microinverters
| String inverter | Hybrid inverter | Microinverters | Inverter + optimisers | |
|---|---|---|---|---|
| How it works | One central unit; panels wired in strings | One central unit that also manages a battery | A small inverter behind each panel | Central inverter plus a DC optimiser on each panel |
| Battery | Needs a separate AC-coupled battery inverter | Built in (DC-coupled) | Usually AC-coupled | Depends on model; some are battery-ready |
| Shading | One shaded panel can drag down its string | As string | Each panel works independently | Each panel optimised individually |
| SEAI minimum product warranty | 5 years | Not listed separately | 10 years | Not listed separately |
For most unshaded Irish roofs facing one direction, a hybrid inverter is the simplest option. Microinverters or optimisers can make sense for complicated roofs with several faces, dormers or partial shade from chimneys and trees.
Sizing a hybrid inverter against the NC6 limit
This is where Irish rules matter. ESB Networks’ micro-generation route, using the NC6 form, covers generators up to 25A single-phase (about 6kVA) or 16A per phase three-phase (about 11kVA) (ESB Networks). Since 31 May 2023, units with a type-tested rated current above 25A are not eligible for the single-phase NC6 route. The CRU says systems above those limits, up to 50kW, need an NC7 application instead (CRU).
The limit applies to the inverter’s AC output, not the total wattage of your panels. That means you can usually fit more panels (DC) than the inverter’s AC rating, within the manufacturer’s limits:
- Huawei’s SUN2000-6KTL-L1 hybrid has a 6kW AC output and a recommended maximum PV power of 9kWp (distributor listing).
- SolarEdge’s Home Hub inverter brochure cites up to 200% DC oversizing (SolarEdge).
- Sigenergy’s single-phase Energy Controllers accept up to twice their rated AC power in PV, so the 6kW model takes up to 12kW of panels (Sigenergy).
SEAI’s Code of Practice adds that the inverter must have a maximum DC power rating of at least the DC peak power of the panel array (SEAI). The inverter must also be type-tested to IS EN 50549-1 with current Irish settings (ESB Networks).
Illustrative sizing examples
These are illustrations, not designs. Your installer will size the system for your roof, usage and supply.
| Panels (DC) | Hybrid inverter (AC) | Within single-phase NC6? | Note |
|---|---|---|---|
| 4kWp | 3.68kW or 5kW | Yes | Matches the SEAI grant maximum of 4kWp |
| 6kWp | 5kW | Yes | Panels exceed inverter rating; small output loss on the brightest days |
| 8kWp | 6kW | Yes, if the inverter is rated at 25A or less | Check the manufacturer’s DC limit and SEAI’s DC rule |
| 10kWp+ | 8kW+ | No | Needs an NC7 application on a single-phase supply |
Remember the SEAI grant counts panels only up to 4kWp, so a bigger system doesn’t earn more grant. Our NC6 form guide covers the paperwork.
Battery-ready vs battery-installed
Some quotes describe a hybrid inverter as “battery-ready”. That’s useful, but check which batteries it works with. Hybrid inverters typically only work with specific battery brands and voltages, so adding a battery in five years could mean you’re limited to a model that’s still compatible. Ask for the compatible battery list in writing. If you’re unsure whether a battery is worth it, see solar panels with battery vs without and our battery storage advice.
How long does a hybrid inverter last?
SEAI’s homeowner guide says the inverter is the most common point of failure and may need replacing during the system’s lifetime (SEAI). An older SEAI article (2018) put that at about 10 years (SEAI blog). Panels usually outlast the inverter, so it’s worth budgeting for one replacement over a 25-year system life and checking how long the manufacturer’s warranty runs.
Questions to ask your installer
- What is the inverter’s exact model, AC rating and rated current?
- Is it type-tested to IS EN 50549-1 with Irish settings, and on the NC6 route for my supply?
- How many kWp of panels are you pairing with it, and how much clipping do you expect?
- Which batteries are compatible, now and in future?
- What is the manufacturer’s warranty, and who handles a claim?
- Can it provide backup power, and which circuits would be covered?
FAQs
Do I need a hybrid inverter in Ireland?
Only if you want a battery now or later. SEAI’s homeowner guide says a hybrid inverter is needed if you are installing a battery or plan to. Without a battery, a standard string inverter or microinverters will work.
Can I put 6kW of panels on a 5kW inverter?
Usually, yes. The NC6 limit applies to the inverter’s AC output, and most inverters accept more DC than their AC rating. Your installer must stay within the manufacturer’s DC limit and SEAI’s rule that the inverter’s DC rating covers the array.
What is the biggest inverter allowed on a single-phase NC6?
ESB Networks’ NC6 route covers up to 25A single-phase, about 6kVA. Units with a type-tested rated current above 25A are not eligible.
Is a hybrid inverter better than microinverters?
Not always. Hybrids make adding a battery easier. Microinverters handle shading and multi-direction roofs better, and SEAI sets a longer minimum product warranty for them (10 years, against 5 for string inverters).
Does the SEAI grant cover the inverter?
The grant is paid on the system as a whole: €700 per kWp up to 2kWp, €200 per extra kWp up to 4kWp (€1,800 cap for panels), plus €600 for a battery of 5kWh or more.
Get your solar quote today
Get your solar quote today. Tell us about your roof and supply, and we’ll connect you with SEAI-registered installers who can recommend an inverter that fits your NC6 limit and future battery plans. Or call 089 450 4544.
