This project is a portable multi-source power system that I designed and assembled as a practical personal energy project, with assistance from my wife, who also studied electrical technology with me in Sweden.
Rather than using a ready-made power station, I built the system around separate lithium battery modules, individual voltage monitoring, selectable battery operation, DC outputs, an AC inverter, solar charging, mains charging, vehicle charging capability, cooling and electrical protection.
The system was designed so that the battery sections can be used individually or together depending on the required load. Four separate battery sections are monitored independently, allowing their voltage condition to be checked directly from the front panel.
The project combines energy storage, DC power distribution, voltage monitoring, solar charging, inverter operation and portable enclosure design in one unit.
It was primarily developed as a practical personal prototype for backup and portable power.
Battery Architecture
The system contains four individually monitored nominal 12 V lithium battery sections.
Each battery section was assembled from individual lithium cells and electrically prepared as a separate module.
The design allows one battery section or multiple sections to be selected depending on the required operating condition.
Individual front-panel voltage displays make it possible to compare the condition of B1, B2, B3 and B4 before or during use.
The photographs show example readings around 12.2–12.4 V across the four battery sections.
Multiple Charging Sources
The system was designed to accept energy from foldable solar panels, a solar charge controller, mains electricity, a vehicle electrical supply when appropriately connected and a dedicated charge input on the enclosure. This makes the prototype useful for testing how one portable storage system can combine renewable and conventional charging sources.
Multiple Power Outputs
The system provides 5 V USB, low-voltage DC, dedicated 9 V and 12 V outputs, application-specific low-voltage supply and nominal 230 V AC through the inverter. This supports compatible equipment such as phones, routers and small electronic devices.
Power Capability
The system was designed around a high-power inverter stage, with the overall portable project intended for loads up to approximately 1500 W when the battery configuration, wiring, thermal conditions and connected equipment allow it.
The installed inverter shown in the photographs is marked as a 2000 W unit; this label describes the inverter hardware and should not be presented as a verified continuous output of the complete battery system.
Monitoring & Control
The enclosure provides direct visual monitoring and physical controls: four B1–B4 battery-voltage displays, battery selection, inverter input voltage/current monitoring, inverter output display, battery-level indication, fan control, status lights, DC controls, the AC inverter section, charging connection and solar controller. The layout allows important electrical conditions to be checked directly during testing and troubleshooting.
Cooling and Protection
Thermal management was an important design consideration. I integrated active cooling with separate fan control and arranged the battery monitoring, inverter, charging and low-voltage sections for independent inspection. Protection and monitoring were incorporated, although this remains a personal experimental build.
Portability
Despite combining four battery sections, an inverter, monitoring electronics, charging hardware and cooling, the complete unit was built as a portable system weighing approximately 3 kg.
My Role
I designed the overall system architecture, assembled the battery sections from individual lithium cells, integrated the charging paths, inverter, DC outputs, voltage monitoring, switches, cooling and enclosure controls, and performed practical electrical testing throughout development.
The project required electrical and mechanical problem solving to arrange components, distribute power, monitor every battery section and combine the charging and output systems.
My wife assisted me during the project. We studied electrical technology together in Sweden, which made the build a collaborative practical electronics project.
Problem Solved
The goal was to create one portable energy unit that could store energy, accept charging from different sources and provide several different voltage outputs without depending on a single fixed power source.
Instead of separate devices for solar charging, storage, DC power and AC conversion, the project integrates these functions into one portable experimental system.
Why it is relevant to Technichus
This project brings together solar energy, lithium batteries, DC and AC electricity, voltage conversion, energy storage, electrical measurement, cooling and system protection.
For a science-center environment, the same principles could become a safe low-power educational station showing energy moving from solar panels into storage and different loads.
It also demonstrates my ability to combine many subsystems into one working physical device.
Personal experimental prototype — not a commercially certified power station. High-current lithium battery systems and 230 V AC inverter outputs require appropriate fusing, insulation, cell protection, thermal management and electrical safety precautions.