Load Shifting with a Home Battery in Ireland: Charge Cheap, Use Smart This Winter
Load shifting is the simplest way to make a home battery pay in an Irish winter: charge it on cheap night-rate electricity, then use that stored power in the expensive day and evening peak instead of buying from the grid. This guide explains how load shifting works with a battery, what it can save, and how to set it up.
Every November we get the same question from customers: if my solar panels barely produce anything in December, is my battery just sitting there doing nothing? The short answer is no. A well-set-up home battery can work just as hard in winter as it does in summer. It simply does a different job.
In this guide we explain how winter changes the way your battery should run, how cheaper night-time electricity fits in, and what the new €600 battery grant means if you are thinking of adding storage this year.
Quick facts: winter batteries in Ireland
- December is Ireland’s dullest month. Met Éireann figures put northern counties at roughly one hour of sunshine a day on average.
- Solar panels still generate on bright, cold days, but output from November to January is a small fraction of summer output.
- A battery can be charged from the grid on a cheaper night or off-peak rate and used during the expensive evening peak.
- Since 6 October 2026, households installing solar can get up to €600 extra for a battery, on top of the solar PV grant of up to €1,800.
- Several suppliers raised electricity prices in October 2026, which widens the gap between cheap and expensive hours.
Storm season tip: most home batteries switch off in a power cut unless backup was wired in. Check whether your solar battery will work in a power cut.
We supply and fit batteries and inverters across Ireland, with the €600 SEAI battery grant (5kWh or more) handled for you.Battery storage & the €600 grant
Why winter changes the job your battery does
In summer, a battery mostly stores your own surplus solar power during the day and releases it in the evening. In winter there is very little surplus to store. On many days your panels will cover part of your daytime use and nothing more.
That does not make the battery useless. It switches from being a solar store to being a tariff tool. Instead of filling up with free sunshine, it fills up with cheaper grid electricity overnight and empties during the evening, when unit rates are usually at their highest and when cooking, lights, washing and heating all pile on at once.
We cover what to expect from your panels month by month in our guide Do Solar Panels Work in Winter in Ireland?
How night-rate charging works
Most Irish homes now have a smart meter. That opens up time-of-use plans, where electricity costs less at night and more at the evening peak. The exact rates and hours differ from supplier to supplier and change regularly, so always check your own bill or your supplier’s current price list.
The basic winter routine
- Overnight: the battery charges from the grid during your cheapest hours.
- Morning: the battery covers breakfast-time use, so you avoid day rates.
- Daytime: any solar your panels produce goes to the house first, with any extra topping up the battery.
- Evening peak: the battery covers as much of the peak as it can.
The saving comes from the difference between what you pay to charge the battery and what you would otherwise pay at the time you use that energy. The bigger the gap between your cheap and expensive rates, the more each charge is worth. Our guide to dynamic tariffs in Ireland goes through how these plans work in more detail.
Set it up properly
Batteries do not do this automatically out of the box. The charging schedule has to match your tariff, and it should be reviewed when you switch supplier or when your supplier changes its hours. Modern systems such as the Sigenergy SigenStor let you set charge windows in the app, and some can respond to price signals automatically. If your battery was set up for summer self-consumption only, it may be leaving money on the table right now.
Why this winter matters
Electricity prices have gone up again this autumn. Bord Gáis Energy put its electricity prices up by 8.8% from 9 October 2026, and Energia raised electricity prices by 4.73% from 12 October, according to reporting in The Irish Times. Other suppliers announced increases too.
When prices rise, every kilowatt-hour you shift from the peak to a cheaper period is worth a little more. A battery will not stop price rises, but it gives you more control over when you buy your power.
Storm season backup: EcoFlow portable power stations
Not every home battery is set up for backup during a power cut. For storm outages, a portable EcoFlow power station can keep the router, phones, lights or a fridge going, and it can be topped up from a plug-in solar panel. We have hand-picked options with Irish plugs.
Load shifting with a home battery: a worked example
Load shifting means charging your battery when electricity is cheap (overnight, on a night or smart tariff) and using that stored power in the expensive day and evening peak instead of buying from the grid. In winter, when solar is weak, it’s how a battery keeps earning its keep.
Here’s a simple reference example. Use your own tariff rates for a real figure:
| Example figure | |
|---|---|
| Usable battery capacity | 10kWh |
| Night rate (illustrative) | 18c per kWh |
| Day/peak rate (illustrative) | 38c per kWh |
| Saving per kWh shifted | 20c, less roughly 10% round-trip losses |
| Saving per full cycle | About €1.60 to €1.80 |
| Over a winter month (about 30 cycles) | Roughly €50 |
To load shift you need a smart meter, a time-of-use tariff with a cheap night or off-peak rate, and an inverter you can schedule (most hybrids, including Sigenergy, GoodWe, Solis and SAJ, can). The bigger the gap between your night and peak rates, the more you save. See our dynamic tariffs guide for how smart tariffs work.
The €600 battery grant
From 6 October 2026, households installing solar panels can get up to €600 for battery storage, paid on top of the SEAI solar PV grant of up to €1,800. Eligibility for the solar grant was also extended to newer homes built and occupied before 2025. As with all SEAI home grants, the work has to be done by a registered installer and you must have grant approval before work starts.
For the full detail on what changed, see our post on the €600 battery grant and wider eligibility, and always check the latest terms on the SEAI website.
Which battery do we recommend?
Irish Wind & Solar has installed over 2,000 systems in six years, and we fit Sigenergy, Tesla, Solis, GoodWe and SAJ equipment. For most homes we recommend Sigenergy’s SigenStor. It is modular, so you can start with the capacity you need and add more later, and its app makes it straightforward to set charging windows around a night-rate tariff.
Whatever brand you choose, the things that matter most in winter are:
- Usable capacity that matches your evening use, not just the size on the box.
- Flexible scheduling so the battery can follow your tariff.
- Backup capability if keeping the lights on in a storm matters to you.
- A solid warranty from a manufacturer with a real presence in Ireland.
Is winter grid charging worth it for you?
It depends mainly on three things:
- Your tariff. No time-of-use plan, no meaningful saving from grid charging.
- Your evening use. Homes that use a lot between roughly 5pm and 11pm benefit most.
- Battery efficiency. A small amount of energy is lost in every charge and discharge cycle, so the price gap has to be big enough to cover it.
If you already have a battery, ask your installer to check your settings before the coldest months. If you are adding one, size it around your winter evening use as well as your summer solar surplus.
Frequently asked questions
What is load shifting?
Load shifting means moving when you buy electricity: charging a battery (or running appliances) during cheap off-peak hours and using that energy in the expensive peak, so you buy less at peak rates.
Is load shifting with a battery worth it in Ireland?
It can be, if your tariff has a big gap between the night and peak rates. As a rough example, shifting 9kWh a day with a 20c gap saves around €50 a month in winter. You need a smart meter, a time-of-use tariff and a battery you can schedule.
Will charging my battery from the grid affect my solar export payments?
Grid-charged energy is meant for your own use. Clean Export Guarantee payments relate to the electricity you export. Talk to your installer about how your system is configured so it does not export grid-charged power.
Do I need a smart meter?
To benefit from cheaper night or off-peak rates, yes. Most homes in Ireland already have one. Your supplier can confirm which plans are available to you.
Can I get the €600 battery grant if I already have solar panels?
The grant was announced for households installing solar panels with a battery. If you already have panels, check SEAI’s current terms or ask us and we will tell you where you stand.
Will my battery keep the house running during a power cut?
Only if it is installed with a backup or EPS function. Many batteries are not set up this way by default. Ask before you buy.
How long does a home battery last?
Lithium iron phosphate batteries, which most modern home batteries use, typically carry warranties of around ten years. Check the specific manufacturer’s warranty terms.
Get your battery working for you this winter
Whether you want a battery added to your existing panels, a new solar and battery system, or just a check that your current settings are right for winter, our team can help. We are SEAI-approved installers and we will give you honest advice on what suits your home and your tariff.
Contact us today for a free, no-obligation quote.
Related: for backup without a fixed battery, see BLUETTI power stations; for fixed batteries, our GoodWe ESA and Solis battery guides.
Related: get ready for winter blackouts in Ireland: what EirGrid alerts mean and how to prepare.
Some links in this post are affiliate links. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
