Stirling Aggregate Experimental Edition II

Sep 16, 2023

A big step towards a powerful micro CHP plant! 

We have equipped the Gen70 unit of the Experimental Edition I with additional elements that make it easier to set up a highly available Micro CHP unit. The user only has to ensure a controlled supply of thermal energy; all other functions are taken over by the unit’s control module.

This initially includes a fully assembled cooling circuit, consisting of a high-performance cooler with a radiator fan and circulation pump. When delivered, the unit is already filled with appropriate cooling water including corrosion and frost protection. A temperature sensor activates the radiator fan as soon as a certain temperature is exceeded.

The unit also starts automatically as soon as a certain temperature at the heater head of the Stirling engine is exceeded. The machine’s synchronous generator is used as a starter motor by supplying three-phase current generated by an inverter. Immediately afterwards, the charging phase begins on the connected battery, the charging current of which can be easily read via the built-in Ampere meter.

Integrated output for two-point charging control

If the user does not already control the battery charge by drawing current, a voltage-controlled switching output is available for charging control. This can be used, for example, to temporarily connect an electric consumer in order to maintain a certain charge level of the battery. However, the switching signal can also be used to switch off the heat source. In this case, the charging current begins to decrease immediately and the charging ends after a few minutes as the machine stops.

48 Volt version in preparation

We receive many inquiries with the requirement to charge 48 Volt battery systems. We meet this need with a generator-rectifier version for this voltage. Although the charging power reaches at least the value mentioned above, the overall efficiency is slightly increased due to the lower charging current. The reason for this is the smaller voltage drop of the bridge rectifier along with the smaller power loss. We will report timely as soon as this version is available.