Take control of your energy usage and costs with Heliostorage’s integrated battery systems. Our ESS70 and ESS70P models offer reliable storage capacity, seamless integration with solar or the grid, and robust backup capabilities when you need them most. Whether you’re running a small business or a large industrial facility, these all-in-one solutions provide the flexibility, resilience, and savings to elevate your energy strategy.
Whether you’re planning a solar setup or already have one, our battery system simplifies your configuration and amplifies your gains. Planning solar? Skip the inverters—our built-in design cuts hardware costs while capitalizing on today’s lower panel prices. Already invested in PV? We’ll help you boost returns through spot market trading and intelligent usage management. And if you’re simply seeking additional revenue, ancillary market integration lets you profit from unused capacity. It’s a truly adaptable solution that evolves with your energy needs.
Store electricity when it’s cheapest and use it during peak hours, cutting monthly costs.
Transform surplus capacity into revenue by selling power on the open market.
Capture surplus solar when demand has been met for later use or trading.
Easily add more BESS units in parallel to meet your increased energy demands.
Built-in backup capabilities keep critical operations running when the grid goes down.
Even when panels are snow-covered, charge at off-peak rates and discharge when prices spike.
Solar panel prices have dropped significantly in recent years. For a new solar PV system, our battery’s built-in inverters let you skip the extra hardware—so you only pay for panels while enjoying the full benefits of storage. Already have solar? Just add our battery to gain immediate control over your energy. And if you have room to expand, there’s no need to upgrade your grid connection—the battery effortlessly manages any additional capacity.
Choosing the right battery system depends primarily on your property’s allowable kVA, which is usually determined by your fuse size. If you have a 3×25 fuse, you’ll likely need the single-inverter ESS70, supporting up to 15.6 kW of peak solar input. Properties with a 3×35 or larger fuse can opt for the dual-inverter ESS70P, offering double the solar capacity. Both models can run with or without solar, and if your kVA allowance permits, multiple units can be installed for even greater storage. If you’re unsure which setup is best, we’re here to help—just get in touch.
The ESS70 has 70 kWh capacity using LiFePO₄ battery cells each having a 10,000-cycle lifespan. It operates in ambient temperatures from 5 °C to 35 °C with humidity levels up to 70 %. It measures 720 × 720 × 1870 mm (similar to a fridge freezer) and weighs 550 kg. It carries an IP 20 enclosure rating, meaning it is suitable for indoor use. It operates at a nominal 400 V mains voltage, and requires a minimum property fuse size of 3 × 25 A. For scalability, up to 10 units can be installed in parallel, and Heliostorage remains responsible for recycling at end-of-life.
Below are the technical specifications for our ESS70 model, designed with a single inverter for streamlined installation and reliable performance.
| Specification | ESS70 |
|---|---|
| Rated Power | 12 kW |
| Maximum AC Input/Output (Apparent Power) | 13.2 kVA |
| PV Input Power | 15.6 kW |
| MPPT Inputs | 2 |
| Strings per MPPT Input | 2 + 1 |
The ESS70P has 70 kWh LiFePO₄ battery pack with a 10,000-cycle lifespan. It delivers over 98 % efficiency in ambient temperatures of 5 °C to 35 °C and humidity up to 70 %. Measuring 720 × 720 × 1870 mm (similar to a fridge freezer) and weighing 600 kg, it carries an IP 20 rating for indoor use and operates at a nominal 400 V. You can install the ESS70P on a property with a 3 × 25 A fuse by limiting its kVA output; with a 3 × 35 A or larger fuse, it can run at full power without restriction. For scalability, up to 10 units can be installed in parallel, and Heliostorage remains responsible for recycling at end-of-life.
Below are the technical specifications for our ESS70P model, a dual inverters for increased power and higher PV input.
| Specification | ESS70P |
|---|---|
| Rated Power | 24 kW |
| Maximum AC Input/Output (Apparent Power) | 26.4 kVA |
| PV Input Power | 2 × 15.6 kW |
| MPPT Inputs | 4 |
| Strings per MPPT Input | 2 × (2 + 1) |
With our ESS70 or ESS70P, you’re not just reducing costs—you’re tapping into new revenue streams. Thanks to lightning-fast, AI-driven transactions from our partner Capalo AI, your battery can act as an “insurance mechanism” in the ancillary market, earning money even without a necessarily charging or discharging. Meanwhile, direct spot market trading with our smart controller lets you buy low, sell high, to capitalize on real-time price swings. It’s a seamless, intelligent approach that turns your battery from a simple backup into a powerful profit center.
We’ve modeled two scenarios to illustrate how a battery system can boost your bottom line. In the first, solar panels pair with spot market trading to offset costs and capitalize on peak prices. In the second, the battery earns revenue through ancillary market participation—no solar required. Both approaches show how our storage solutions create tangible financial benefits, giving you more control over your energy strategy.
Below is a typical business load profile, with energy consumption peaking Monday through Friday (9 a.m. – 5 p.m.) and dropping on weekends. The total annual usage stands at 48.9 MWh, calculated at a flat rate of €0.08/kWh. After factoring in transfer fees and 25.5 % VAT, the total yearly bill comes to €7,085. The cases below illustrate the potential earnings for these cases.
PAYBACK TIME < 5 years.
| Annual Demand (MWh) | 48.9 MWh |
|---|---|
| Cost for Previous Year (EUR) | 7085 EUR |
| Est. Annual Savings (EUR) | 4,486 EUR |
| Annual Demand (MWh) | 48.9 MWh |
|---|---|
| Cost for Previous Year (EUR) | 7085 EUR |
| Est. Annual Profit (EUR) | 5,500 EUR |
Our battery cabinet is designed for maximum ease of setup. If you’re installing solar, simply run the panel wiring back to the cabinet, wheel it into place, and lock it down. From there, connect the AC, CT meter, and internet—then switch on the battery. That’s it! You’re now ready to generate, store, and manage your energy without any complicated procedures.
Our battery offers multiple operating modes tailored to your energy goals. Whether you want to maximize on-site consumption, trade power on the spot market, or blend both approaches, you have full control. The system can even be set to manual mode, letting you decide when to charge or discharge. This flexibility ensures that, whatever your priorities—cost savings, revenue generation, or backup—you can configure the battery to meet your exact needs.
With solar and wind production varying throughout the day, the grid can face instability and extreme price fluctuations. We can help to balance these fluctuations through the different trading modes offered. We also give you the added benefit of having a backup should there be a blackout, ensuring your business can continue to run smoothly.
Trading Mode optimizes energy buying and selling by leveraging available spot prices one day ahead. The system uses Max-Min value pairs to determine the best times to charge and discharge the battery based on future energy prices and the system’s capacity.
In summary, Trading Mode uses day-ahead spot prices and trend analysis to optimize when to buy energy at low prices and sell at high prices, using the battery solely for profit-making trading.
Balance Mode combines the Trading Mode strategy, where energy is bought and sold based on day-ahead spot prices, with the additional need to manage the load (energy demand). This mode ensures that the energy system remains balanced while also optimizing energy trading to make a profit.
In summary, Balance Mode optimizes the energy system by combining Trading Mode with effective load management. It ensures that the battery is used for profit-making trading while still meeting energy demands, maintaining a balanced and efficient system.
Without storage, any surplus solar production is fed back to the grid. This often happens when electricity prices are lower, and you end up buying power at peak times when rates are highest. With a battery, however, you can capture excess solar during midday—when prices are cheap—and discharge that stored energy during the morning and evening peaks, when electricity is most expensive. Even in winter, when solar output can drop due to snow coverage, the battery continues to optimize costs by charging with off-peak electricity and discharging at peak demand, guaranteeing year-round affordability.
You can explore some of our customer references showcasing both the electrical and thermal solutions. From commercial buildings to industrial facilities, these case studies highlight some of the possibilities with our systems. Book a call to find out how we can help you lower your energy costs.
Whether you’re looking for electrical or thermal solutions, or a way to further optimize your energy strategy, our full range of products is designed to meet your evolving needs. Explore what else we offer to discover how we can help you achieve even greater savings and resilience.
Complete our short questionnaire, and we’ll craft a detailed proposal tailored to your specific requirements. From emission reductions, to cost savings, to payback timelines and installation details, our team will provide a comprehensive breakdown—ensuring you have all the information you need to make a confident decision.
Heliostorage Oy
Sokojantie 879
67500 Kokkola
Finland
+358 44 972 8921
sales@heliostorage.com
