Toimiiko tavallinen akku sähkökatkossa?

Ei välttämättä. Verkkoon kytketty invertteri voi turvallisuussyistä sammua katkon aikana. Varavoima vaatii saarekeajoon tarkoitetun toteutuksen ja verkon turvallisen erotuksen.

Mitä eroa on UPS:llä ja akkuvarastolla?

UPS on suunniteltu erityisesti keskeytyksettömään syöttöön herkillä kuormilla. Akkuvarasto voi palvella myös energian optimointia, mutta sen vaihtotapa ja soveltuvuus varmistetaan erikseen.

Kuinka pitkäksi aikaa akku riittää?

Käyttöaika riippuu käytettävästä kapasiteetista ja kriittisten kuormien tehosta. Esimerkiksi kaksinkertainen kuorma lyhentää samalla kapasiteetilla käyttöajan likimain puoleen.

Korvaako akku dieselgeneraattorin?

Joissakin lyhyen varakäynnin kohteissa kyllä. Pitkiin katkoihin voidaan tarvita generaattori tai hybridijärjestelmä, koska akun energia on rajallinen.

Backup power and security of supply

A power cut won't stop operations.

Power cuts and voltage fluctuations can halt production, disrupt the cold chain, or shut down services. Emaldo's commercial solution keeps production lines, refrigeration, tills, and servers running when the grid is down.

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Three reasons

Why energy storage pays off

Rapid support during disruptions

Battery storage supplies power to critical loads during power cuts and voltage disturbances.

Critical operations secured

On farms, milking, feeding, ventilation, and cooling continue; in industry, critical production lines stay running.

Also for areas with a weak grid

At the end of long power lines, power cuts are common – a battery and solar panels bring self-sufficiency to holiday homes and island properties.

Typical applications

Farms and livestock production
Cold chains and storage facilities
Critical industrial processes
Holiday homes and archipelago locations

Solutions for this need

Emaldo PL-EL-100/209

A 100 kW / 209 kWh all-in-one solution for critical load continuity in commercial properties and enterprises.
Emaldo PL-EL-125/261-G-PS100

Integrated battery, solar PV and backup power solution for farms and heavy electricity consumers.

The basics

Can an energy storage system provide backup power?

An energy storage system can serve as backup power for a business when designed for island mode (islanding) and critical loads during a power cut are clearly defined. A standard grid-tied battery does not automatically continue supplying power during an outage; this setup requires proper switchgear, protection, and control.

UPS, battery storage, or generator?

UPS for very short outages and uninterruptible power supply to sensitive equipment
Battery storage for fast response and pre-dimensioned backup runtimes without local emissions
Generator for extended backup runtimes when fuel logistics can be arranged
Hybrid setup when both rapid response and long runtime are required
Load prioritisation when backing up all consumption is not cost-effective

Sizing

Sizing backup power

Power rating is sized according to critical loads running simultaneously. Capacity is determined by the desired runtime and the energy demand of these loads. Inrush currents and motor loads are assessed separately.

1Continuous and surge power of critical equipment
2Allowable switchover time and transfer switch requirements
3Target backup runtime
4Automated load prioritisation and shedding
5Recharging capabilities during prolonged outages

Operational reliability must be verified

Backup power is designed with safe grid disconnection, protection, testing, and maintenance in mind. In extended outages, battery capacity is finite, meaning a generator or other on-site generation may be necessary. The setup must always be confirmed by a qualified electrical engineer.

Frequently asked questions

Questions about energy storage

Does a standard battery work during a power cut?

Not necessarily. For safety reasons, grid-tied inverters automatically shut down during an outage. Backup power requires dedicated islanding capability and safe automatic grid disconnection.

What is the difference between a UPS and battery storage?

A UPS is designed specifically for uninterruptible power delivery to sensitive loads. Battery storage can also be used for energy optimisation, but its switchover time and suitability must be verified separately.

How long will the battery last?

Runtime depends on usable capacity and the power demand of critical loads. For example, doubling the load will roughly halve the runtime on the same capacity.

Does a battery replace a diesel generator?

For applications with short backup runtime requirements, yes. For extended outages, a generator or a hybrid system may be needed, as battery storage capacity is limited.

Sources and updates

Content reviewed 8.10.2026. Market terms, tariffs and technical suitability are always checked for each site.

Knowledge hub

Size your energy storage system to suit your site

Estimated demand charge savings, price arbitrage and payback period. Prices VAT 0 %.

1.Sector

Opening hours Mon–Sat, quiet at night

06121823

Peak-day load · battery shaves peaks during highlighted hours

2.Distribution network operator

Distribution network operatorNetwork tariff

Source: Caruna Oy hinnasto, voimassa 01.09.2024.

3.Site

Annual consumption

MWh

Peak demand

Default from profileElectricity tax category

4.Spot prices

Reserve markets

Fixed lease income: capacity is leased to the grid operator at a fixed rate.

Estimated annual benefit · VAT 0 %

10 148 €/v

We recommend: Emaldo PL-EL-100/209 · 100 kW / 209 kWh

Huipunleikkaus (tehomaksu)−14,5 kW620 €
Price arbitrage (energy)2 403 €
Transmission + tax, including efficiency losses−375 €
Reservimarkkinat (Floor/Market/Tolling)7 500 €

Assumption: 250 cycles/year, discharge period 2 h, peak 121 kW, data: Esimerkkidata: FI-aluehinnat 10/2025–9/2026.

Request precise sizing

Sources: Caruna Oy price list 1.9.2024; Caruna Espoo 1.1.2026; Elenia large customer price list 1.4.2026 (product names inferred from the PDF, check the source); electricity tax from Elenia's 1.4.2026 price list. Helen Sähköverkko's business price list has not been verified: use 'Custom tariff'. Spot data: Nord Pool FI area prices (Elering, valitsesahko.fi), monthly average prices 10/2025–9/2026 and hourly profiles for January, April and July 2026 and October 2025, excluding VAT. Profiles for other months are derived from the nearest seasonal profile, so day-to-day variation is missing and the arbitrage estimate is a conservative lower bound. Prices are historical, not forecasts. Industry profiles are approximations, not measured data; actual peaks are often sharper. Reserve market revenues: Floor 55 000 €/MW/year and Tolling 75 000 €/MW/year (Watti, 8.10.2026), Market estimate varies (benchmark Clean Horizon Battery Index 2h). The model excludes load control, electricity storage tariffs offered by distribution network operators and financing costs. All prices VAT 0 %.