1Komma5° launches battery system for households without solar

The Hamburg-based start-up 1Komma5° has introduced a new battery storage product designed to help households, particularly renters and those without rooftop solar, benefit from fluctuating electricity prices on the power exchange. Prices for the system start at €8,900, with an additional monthly software fee.

The product, named PowerHarvester, is a lithium-iron-phosphate (LFP) battery available in six performance classes, offering storage capacities ranging from 7.7 kWh to 27.2 kWh.

As the company explained to pv magazine Germany, the system is designed to function independently of a photovoltaic installation.

According to the start-up, the recommended retail price of €8,900 includes installation, the Heartbeat AI energy management system, and the installation of a smart meter, which is required to take advantage of dynamic electricity pricing. Customers must also subscribe to 1Komma5°’s “Dynamic Pulse” tariff and pay a monthly fee of €9.90 for the Energy Trader software feature.

“The PowerHarvester, managed by Heartbeat AI, automatically buys electricity when market prices are especially low and later supplies it to the customer, or sells it back to the grid, when prices are high,” said Philipp Schröder, CEO and co-founder of 1Komma5°. Based on data from nearly 50,000 energy systems, the company claims that electricity costs could be reduced by up to 50%.

For households with high electricity consumption—over 10,000 kWh per year, which is beyond the average for typical private households—the company estimates that the investment could pay off in as little as six years. Such consumption levels would typically involve large loads like heat pumps, electric vehicles, or other major appliances. According to 1Komma5°, additional savings could be achieved through planned reforms to network tariffs that support greater flexibility.

The new storage solution also aims to resolve existing technical limitations. The digital energy management system is now compatible out of the box with all inverters, charging solutions, and heat pumps already in operation, the company said. Previously, compatibility with Heartbeat AI had only been possible with selected manufacturers.

“The real problem with the energy transition is not the low-cost electricity produced from wind and solar, but a rigid grid without smart meters and insufficient storage capacity,” said Jannik Schall, co-founder and Chief Product Officer at 1Komma5°.

“Instead of subsidizing the old, rigid energy system with billions, politicians should continue working to promote complete flexibility and the rollout of smart meters, and also exempt small electricity storage systems from grid fees, which would further improve economic efficiency,” he added.

From pv magazine Germany.