Sigenergy in Ireland: Reading a SigenStor Quote

A SigenStor is not a battery. Sigenergy describes it as a five-in-one system: solar inverter, battery pack, battery PCS, energy management system and an optional EV DC charging module, stacked into one cabinet. That is why two Irish quotes for "a Sigenergy" can differ by thousands without either installer being wrong. They are quoting different stacks. It is also why the brand's most-quoted specifications, the 25 kW car charger and the 12 kW single-phase output, do not describe what a standard Irish house is allowed to connect.

What Is Actually in the Cabinet

Sigenergy is a Shanghai company founded in 2022 and listed on the Hong Kong Stock Exchange in April 2026. It does not sell to homeowners. It sells through distributors and registered installers, which is the first practical thing to know: there is nobody at Sigenergy to ring about your price, and the Irish installers who fit it are competing on the same hardware.

The SigenStor integrates five things Sigenergy lists separately elsewhere in its range. The solar inverter converts what the panels make. The battery pack stores it. The battery PCS handles charge and discharge. The energy management system decides when each of those happens. The EV DC charging module, which is optional, charges a car straight from DC.

The battery side is genuinely modular. Each pack carries its own DC-DC optimiser, which Sigenergy says allows mixed use of old and new modules with different capacities and states of health, so a stack can be extended years later without matching what is already there. The cells are LiFePO4 rated at 314 Ah, the claimed depth of discharge is 100% of usable capacity, and the enclosure is IP66 with an operating range of -25°C to 55°C. Sigenergy quotes around 30 dB of noise and a 55 kg weight for a 5 kWh module, and the unit can be floor-standing or wall-mounted.

The Number ESB Networks Cares About

This is where SigenStor marketing and Irish reality separate. ESB Networks defines a micro-generator as a source rated up to and including 25 amperes, roughly 6 kVA, at low voltage on a single-phase connection, or 16 amperes, roughly 11 kVA, on three phase. Stay inside that and connection is free under the inform-and-fit process: your installer submits the NC6 notification form with a type test certificate and the grid work costs you nothing.

Go outside it and there is no discretion available. ESB Networks states that from 31 May 2023, any unit with a Rated Current as per type test above 25 A is not eligible for connection under the NC6 micro-generation route. Above micro-generation you are into mini-generation, which ESB Networks defines as 25 amperes (6 kVA) to 72 amperes (17 kVA) on a single-phase connection. That is a different animal entirely: an NC7 application form, a non-refundable fee of €995.07 including VAT, and an average of 8 to 10 weeks from payment of that fee before the connection offer issues.

Now put Sigenergy's published figures beside that. The single-phase Sigen Energy Gateway Home is rated at 12 kW nominal AC power. The HomePro SP-F variant is rated at 22 kW and supports 100 A backup and grid port circuits. Neither of those is a number a standard Irish single-phase domestic connection will be permitted to export at. The answer is not that Sigenergy cannot be installed here, because it plainly is being installed here in volume. The answer is that the specific energy controller variant on your quote has to be one whose type-tested rated current is 25 A or less, and its type test certificate has to say so on paper, because that certificate goes to ESB Networks with the NC6 form.

The inverter also has to comply with I.S. EN 50549-1 with current Irish settings. Any SEAI-registered installer will be fitting compliant hardware, but with a brand that ships globally it is worth one direct question: which country profile is this unit shipping with, and who sets the Irish one. Our guide to solar inverters in Ireland covers why the inverter, not the panel, is the component Irish rules attach to.

What the SEAI Grant Pays For, and What It Does Not

The SEAI Solar Electricity Grant pays €700 per kWp for the first 2 kWp and €200 for every additional kWp up to 4 kWp, capped at €1,800, and SEAI has confirmed the maximum stays at €1,800 in 2026. It is paid pro rata, so a 2.5 kWp array draws €1,500. Every euro of that is calculated on installed panel capacity.

There is no battery line in the table. There is no controller line and no EV charger line. If your quote is a 4 kWp array plus a 27 kWh SigenStor, the grant is €1,800, exactly the same as it would be for the same array with no battery at all. Our page on the solar battery grant in Ireland covers what is actually available for storage, and the SEAI solar grant covers the application itself.

The eligibility rules catch people out more often than the amounts do. The home needs an MPRN and must have been built and occupied before 2021. The grant is closed to homes that have already had solar PV funding at that MPRN. Approval has to be in place before any work starts, and once you have the Letter of Offer you have eight months to finish the works and submit the documentation. A post-works BER by a registered assessor is required before the grant is paid, and SEAI asks for four to six weeks to process payment after that.

On VAT, the treatment follows the contract rather than the box. Installers generally apply the 0% solar PV rate to a battery supplied as part of the same supply-and-install solar contract, while a standalone battery retrofit may attract the standard rate. On a package the size of a SigenStor that difference is not small, so get the VAT treatment confirmed in writing before you order, not after.

Backup: The Part That Needs a Second Box

The 0 ms figure attached to Sigenergy in every comparison video is real, but it belongs to the Sigen Energy Gateway rather than to the SigenStor. Sigenergy's own description is explicit: the gateway, integrated with a SigenStor or SigenStack, detects a grid outage and transitions to backup power, and the patented control algorithm is what delivers 0 ms load-side disruption. Without the gateway you are buying storage, not whole-home backup.

The gateway range is where the real specification decisions sit. The single-phase Sigen Gateway Home supports one SigenStor, 12 kW nominal AC power and 54.24 kWh. The HomePro SP-F supports two SigenStors, 22 kW, 108.48 kWh and 100 A on both the grid and backup port circuits. The three-phase HomePro is rated at 30 kW. Sigenergy also lists a built-in bypass circuit, 100 ms reverse power flow protection, diesel generator support with two-wire start, and lab-measured noise under 25 dB on the HomePro TP.

Irish wiring rules have their own view of island mode, and it is worth reading before you buy backup. Protection behaves differently when the house is running off the battery, which is why Safe Electric requires every circuit supplied in island mode to be RCD protected and the RCDs verified in both modes. Our page on inverter and RCD tripping goes through that in detail.

SigenStor and Powerwall 3 Are Not the Same Purchase

The comparison people actually want is against the Tesla Powerwall 3, and the honest answer is that they solve the problem differently. Tesla's Irish site lists the Powerwall 3 at 13.5 kWh of energy capacity, on-grid and backup power of up to 5 kW depending on local conditions, three solar inputs with maximum power point trackers, 97.5% solar-to-grid efficiency, 130 kg, scalable to four units and a ten-year warranty. It is one fixed unit that you buy again if you want more.

Sigenergy's proposition is the opposite: start small, stack later, and fold the car charger into the same cabinet. If you already know you want 25 kWh or more, or you want DC charging for an EV without a second wall box, the modular route has an argument. If you want 13.5 kWh and nothing else, a fixed unit with a decade of Irish installations behind it has a different one.

One caution on the V2H and V2G claims. Sigenergy states plainly that V2X functionality is limited by the vehicle's capabilities and that the feature can be enabled over the air once the relevant standards are published. Buying a SigenStor today on the strength of selling power out of your car tomorrow is buying a roadmap, not a product. Charging the car from surplus solar is a different and entirely real thing, and our guide to charging an electric car with solar panels covers how that works on Irish generation.

Why There Is No Price on This Page

No Irish installer or distributor publishes a list price for a SigenStor, and the prices circulating in Facebook groups and on boards.ie are individual quotes for stacks nobody else can see. Quoting one of those as a market price would be inventing a figure.

What you can do instead is force the quotes into a comparable shape. Ask each installer for the array size in kWp, the module part number and kWh rating, how many modules, whether a gateway is included and which one, whether the EV DC module is in the price, the VAT treatment, and the warranty term in writing. Then divide the storage part of the price by usable kWh. Our battery storage guide has the general Irish price ranges for context, and vetting a solar installer is worth reading before any of this.

One more thing that is not in the hardware price at all: the export side. Whatever you cannot store or use is sold back, and the rate varies by supplier. Our Clean Export Guarantee rates page has the current figures, and microgeneration in Ireland explains how the payment works.

Six Questions for the Installer

1. What is the type-tested rated current of this energy controller? If the answer is above 25 A it cannot go through NC6 on a single-phase house.
2. Which module, and how many? Part number and kWh rating in writing. Several pack sizes are in circulation and each one changes the comparison.
3. Is a gateway included? No gateway, no whole-home backup, regardless of what the brochure says about 0 ms.
4. What exactly is the SEAI grant calculated on here? It should be the kWp of panels and nothing else.
5. Which VAT rate is applied and why? Especially if the battery is going in on its own rather than with a new array.
6. Who honours the warranty in Ireland, and for how long? A young brand sold through installers means the answer is the installer, the distributor, or both.

Frequently Asked Questions

Is Sigenergy available in Ireland?

Yes. Sigenergy sells through distributors and registered installers rather than direct to homeowners, and several Irish solar companies install the SigenStor. There is no Sigenergy sales office to buy from directly, so every Irish price comes through an installer.

Does the SEAI grant cover a Sigenergy battery?

No. The SEAI Solar Electricity Grant pays €700 per kWp for the first 2 kWp and €200 for each additional kWp up to a maximum of €1,800, calculated entirely on installed panel capacity. There is no battery, inverter or EV charger element in the grant table, so the storage part of a SigenStor quote attracts nothing.

How much does a SigenStor cost in Ireland?

No Irish installer or distributor publishes a list price, and the system is modular, so a quote depends on the energy controller, how many battery modules, whether a gateway is included and whether the EV DC charging module is fitted. Compare quotes on euro per usable kWh with the module part number written down, rather than on a headline total.

What is the maximum SigenStor size I can connect in Ireland?

Storage capacity is not what ESB Networks limits. It limits the generator rating: a micro-generator is rated up to 25 amperes, about 6 kVA, single phase, or 16 amperes, about 11 kVA, three phase, and since 31 May 2023 any unit with a type-tested rated current above 25 A is not eligible under the NC6 route. Beyond that you are into mini-generation, which runs from 25 A (6 kVA) to 72 A (17 kVA) single phase and carries an NC7 application and a non-refundable fee of €995.07 including VAT.

Is a SigenStor better than a Tesla Powerwall 3 in Ireland?

They answer different questions. The Powerwall 3 is a fixed 13.5 kWh unit with an integrated solar inverter, up to 5 kW on-grid and backup power depending on local conditions, and a ten-year warranty, scalable to four units. The SigenStor is modular, reaching 54.24 kWh on a single-phase gateway, and can include a 25 kW DC EV charger in the same cabinet. Modularity and integrated car charging favour Sigenergy; a single fixed unit with a long Irish track record favours Tesla.

Does a SigenStor give me backup power during a power cut?

Only with the Sigen Energy Gateway. Sigenergy's 0 ms load-side disruption figure describes the gateway integrated with a SigenStor, not the SigenStor alone. The single-phase Gateway Home supports one SigenStor at 12 kW nominal AC power, and the HomePro SP-F supports two at 22 kW with 100 A backup and grid port circuits.

Can the SigenStor charge my EV and send power back to the house?

It can charge a car from DC at up to 25 kW through CCS2, which Sigenergy puts at roughly 130 km of range per hour. Vehicle-to-home and vehicle-to-grid are a different matter: Sigenergy states that V2X is limited by the vehicle's capabilities and can be enabled over the air once the relevant standards are published. Treat it as a future capability rather than something to pay extra for today.

What battery module sizes does the SigenStor use?

Two sets of figures are currently in circulation. Many installer pages, and Sigenergy's own older material, describe 5 kWh and 8 kWh modules expanding to 48 kWh per stack. Sigenergy's current gateway page instead rates one SigenStor at a maximum of 54.24 kWh and two at 108.48 kWh, and neither figure divides evenly into 5 kWh or 8 kWh packs. Ask for the exact part number and kWh rating on your quote rather than relying on either set.

Can I mix old and new battery modules later?

Sigenergy says yes. Each battery pack contains its own DC-DC optimiser, which the company says allows parallel connection of packs and mixed use of old and new batteries with different capacities and states of health. That is the core argument for the modular approach: you can start smaller and add later without replacing what you have.

Do I still need an NC6 form for a battery-only Sigenergy install?

If the inverter is capable of exporting to the network, yes. The test is whether the equipment can energise the network, not whether panels are attached. Our page on a home battery without solar covers the notification, the type test certificate and the zero-export question in full.