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Solar Battery Storage Expansion: 10 to 30 kWh Case Study

30 kWh-s akkumulátoros napelemes energiatároló bővítés kivitelezése - Smart Deployment Kft.

During one of our recent installation projects in Hungary (Pest County area), our client decided to expand their existing system based on real-world operational data. In this article, we showcase how a solar battery storage expansion from 10 kWh to 30 kWh was carried out and present the concrete performance results after one year of operation.

When planning a solar battery storage expansion, one of the most common questions is choosing the right battery capacity. While consumption profiles can be estimated in advance, the most accurate answers are provided by the first year of actual operating data.

We commissioned a hybrid solar system equipped with a 10 kWh battery storage unit for our client nearly a year ago. After analyzing the system statistics and consumption habits of the past period, a clear conclusion emerged: adding an extra 20 kWh of storage capacity was the optimal step to make better use of locally generated surplus energy.

Why Was the Solar Battery Storage Expansion Necessary?

The 10 kWh battery performed exceptionally well in smoothing out daily peak demand and covering early evening hours. However, during the high-production summer periods, the storage filled up quickly, sending surplus energy back to the grid. Meanwhile, during late night or early morning hours—especially with high-energy appliances like AC units or heat pumps running—grid import was still occasionally required.

napelemes energiatároló bővítés előtt: 10 kWh akkumulátor mérései 15.54 kWh hálózati vételezéssel

With the 10 kWh battery, 15.54 kWh of grid import was still needed in summer, while 19.12 kWh of surplus energy was exported to the grid.

According to the measurement data, the 10 kWh storage setup still required 15.54 kWh of grid import on a single peak summer day, while 19.12 kWh of excess energy was exported.

Upgrading to a 30 kWh total capacity elevated the system’s performance to a whole new level.

Real-World Results of the Battery Storage Upgrade

napelemes energiatároló bővítés után: 30 kWh akkumulátor mérései 0 kWh hálózati vételezéssel

After the 30 kWh expansion, daily grid import dropped to 0 kWh, with 98% of generated solar energy consumed locally.

Following the 30 kWh upgrade, daily grid import dropped to practically 0 kWh. Grid export was reduced to just 2.36 kWh, meaning 98% of the generated energy is now utilized locally.

  • Summer Grid Independence: Thanks to the increased battery capacity, the property completely eliminated grid power consumption during summer months.

  • 100% Local Consumption: Day-time surplus energy is stored in the batteries, fully covering the household’s power demand through the night and during consecutive cloudy days.

  • Virtual Off-Grid Operation: The system capacity now enables the house to operate completely independently from the main grid during the summer.

Why Choose a Scalable Energy Storage Architecture?

This case study demonstrates that energy storage is not a rigid, one-time decision. Modern hybrid inverters and modular battery technologies allow for flexible capacity expansion.

Systems can easily be adapted as energy habits evolve, making a modular solar battery storage expansion a future-proof investment.

Planning to Expand Your Existing Solar System?

Looking to maximize your solar energy utilization and minimize grid dependency? The Smart Deployment team provides end-to-end engineering and installation services across Hungary.

Contact our expert team on our Contact page to analyze your consumption data together, or visit our Napelem22 platform for residential solutions!

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Commissioning a Growatt MOD 10KTL3-X Inverter in a Family Home

Growatt energiatároló rendszer bemutatása szakértői tanácsadással

We recently installed a Growatt MOD 10KTL3-X three-phase inverter for a family of four. The inverter manages the energy generated by a 10 kWp solar panel system.

The customer’s primary goal was to reduce electricity costs while ensuring that the system could be expanded with battery storage in the future. Reliability, good value for money and an advanced online monitoring system were key considerations when selecting the Growatt inverter.

During the installation, the inverter was mounted on the wall, the DC and AC connections were completed, and the online monitoring system was configured. The customer can check the system’s current output and energy generation data from a mobile phone within seconds, and monitor its operation at any time.

Based on the first few weeks of operation, the system is working reliably. The online platform also provides detailed information about daily, monthly and annual energy generation.

Growatt inverters can be an ideal choice for family homes and smaller businesses where reliable operation and the option of future expansion are important.

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Shelly Pro 3EM: When You Want to Know Exactly Where Your Energy Goes

Shelly Pro okos energiafelügyeleti rendszer mobilalkalmazással

Many households and businesses face the same question: which appliances account for the largest share of their energy consumption? In one of our recent projects, we addressed this issue by installing a Shelly Pro 3EM energy monitoring system.

The Shelly Pro 3EM measures energy consumption across three phases and transmits the data to the user in real time. With the system’s help, it is possible to identify which appliances, electrical circuits or areas of the property have the highest energy demand.

The installation took only a few hours. Afterwards, the customer was able to view detailed consumption data on both a mobile phone and a computer.

Based on the first month’s data, several consumption patterns were identified. Optimising these patterns can result in significant energy savings. The system is particularly useful for customers who already have a solar panel system and want to maximise their use of self-generated energy.

Shelly solutions provide an excellent foundation for intelligent energy monitoring and the development of smart home systems.

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Hybrid Inverter and Energy Storage Combined – A Modern Home Energy System

Inverter és otthoni energiatároló rendszer családi háznál

For a newly built family home, we designed and commissioned an energy system that already meets the energy requirements of the future. At the heart of the project was a hybrid inverter combined with a 10 kWh battery storage system.

The system is designed so that the solar energy generated during the day is not automatically fed into the grid. Instead, it is first used to charge the battery. The stored energy can then be used by the property during the evening hours.

During installation, we paid particular attention to configuring intelligent energy distribution. The inverter continuously monitors energy generation, consumption and the battery’s state of charge, then automatically optimises the system’s operation based on this data.

An additional benefit for the customer is that, in the event of a power outage, the most important electrical appliances can continue to operate. This provides not only greater convenience but also enhanced security for the property.

Systems like this are becoming increasingly popular among those who want to reduce their dependence on the electricity grid and make the most of their investment in solar energy over the long term.