The product


The product is an energy production and storing unit that generates electric current using exclusively clean, “green” energy. The generated power can either be used directly or delayed. It uses the power above direct consumption to split water producing hydrogen in which relatively big amount of energy can be stored in a concentrated way. By a fuel cell (FC), power can be reproduced from the hydrogen.

The product idea


E. ON. Hungária Ltd, requested us to develop a product that is able to generate, supply and store electric power from solar energy according to predetermined parameters.
 

Operation


The PV system installed on the top of the container generates electrical power that can either be consumed directly or stored in the primary battery storage. If there were no direct consumption, and the batteries were filled, hydrolysis would start, the produced hydrogen would be stored in tanks or cylinders placed outside the container. In the night or on cloudy days when the PV system doesn’t work, consumption requirements can be met from the batteries and/or hydrogen generating power by the fuel cell even for up to 15 consecutive days.
The product has got a comprehensive monitoring and remote control system through which the autonomous operation is provided. The capacity of the container meets the average household requirement: 4,000 kWh/a, 3 x 16A/230V. In that case, the security of supply was determined at 99%.

Architecture


The frame and shell of the product is a 20-foot container that is covered with a 20 cm thick insulation and a metal coating on it. The insulation protects the batteries from overheating in summer, and the hydrogen section from cooling down in winter. Inside the product is divided by an explosion proof metal wall that separates the electrical and hydrogen sections without break through.
The electrical section includes the battery system, inverters, chargers and the distribution cabinet including the controlling and fuses. The gas section contains the electrolyser, water tank for distilled water, fuel cell, heating devise to heat room, sensors to provide gas security and the ventilator. The supporting structure is fastened on the top of the container so that the modules are oriented to south tilted in 45⁰. The container is surrounded by an electric and mechanic fence.

Details


• The forecasted capacity of the system, calculated with a 10% safety factor, is 13 400 kWh/a
• Planned direct consumption is 3 650 kWh/a
• Reserve: 2 400 kWh/a
• Loss on batteries: 2 350 kWh/a
• Estimated loss on the hydrogen generation and conversion is 2 560 kWh/a
• Operation of the system (cooling, heating, ventilation, property and fire protection, communication) requires 2 440 kWh/a
• The aim of calculating the reserve is twofold:
1. To cover estimation errors when calculating the energy needs of operation and losses
2. It provides possibilities to occasionally use more current above the average daily consumption in summer.

Monitoring


The operation of the system can be monitored through Internet, and, where necessary, interfere in the operation. This possibility is provided by a built-in remote monitoring system and a PLC. The operation data of the system can be displayed on a pc and/or smart phone.