Swedish Household PV-BESS Studies (Rinio 2025, Ollas et al 2026)

Two Swedish studies of what a household battery earns, one read in full (Rinio, Karlstad University, Energies 18(21):5658, funded by Energimyndigheten’s SOLVE project) and one known from its abstract only (Ollas et al., RISE and Energimyndigheten, CIGRE session material C6-11414, 2026; the full paper is not free). Their published date is the MDPI date.

Rinio (Karlstad)

• One modern single-family house with a 12.8 kWp PV system, real consumption and generation data for 2019–2024 (5,345 kWh imported a year), spot prices plus taxes and fees; a virtual AC-coupled battery charged to maximise self-consumption. PV cost SEK 160,000 less a 30 % subsidy (SEK 8.75/Wp).
• PV alone: a little over SEK 10,000 a year, payback about 12–14 years at 2–4 % interest. Only a small part of the PV benefit comes from lower capacity charges.
• Battery: used only for self-consumption it does not pay off; a 16 kWh battery at about SEK 75,000 after a 50 % subsidy returns SEK 1,000–2,000 a year. The SEK 0.60 per exported kWh tax reduction made the battery’s benefit fall with larger capacity, and the paper suggests this may be the reason the government removed it from 2026.
• Tariff mechanism (the DSO in the study introduced a capacity charge in February 2025): the hourly average of imported power is taken; hours between 22:00 and 06:00 count ×0.5; the three highest values in the month are averaged and multiplied by the charge per kW. The paper says Swedish tariffs can have over 20 parameters (23 listed) and that the house’s 16 A fuses set the lowest base tariff.
• Not tested: peak shaving to cut capacity charges, arbitrage and an aggregator selling on the frequency markets; the paper says these could improve the result but need forecasting.
• It describes Fiedler et al. (four holiday houses in Sälen, three tariffs) as finding batteries “highly profitable” where DSOs charge capacity on the monthly peaks, using a simulated advanced strategy that forecasts peaks and prices, which today’s controllers might not have, and with subsidies. Fiedler’s own paper is on Source - Fiedler Holiday Homes PV Battery Demand Charges (2022): against PV alone the battery gain is nil to slight, and clear only with high charges and peaks all year.

Ollas et al. (abstract only)

• Four Swedish single-family archetypes (varying heating, load and EV), twelve PV and battery configurations, tested in the laboratory with a condensed 4-day series and then modelled over a full year with hourly spot prices and a peak power tariff; the energy management combines self-consumption and peak shaving.
• Results: PV cuts annual operating costs by 47 % on average; a battery adds a further 11 percentage points, mainly through self-consumption and fewer grid imports, but its effect on peak power tariffs was limited. PV alone pays back better than PV plus battery without incentives; bigger batteries give marginal gains and longer payback.
• Conclusion: battery economics with self-consumption and peak shaving are modest under current tariff structures; adaptive control and revenue stacking (arbitrage, ancillary services) seem essential.

Relevance

Public evidence that a household battery’s tariff savings are small without peak-targeted control, plus a worked example of a Swedish capacity-charge formula. See Elnätsavgift — What Determines Your Bill and Energy Storage. Neither study treats connection-point control (fuse or subscription limits, DSO or aggregator control).

Limits of this summary

Rinio: figures, tables and formulas were not in the extracted page text. Ollas et al.: abstract and metadata only.