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Electricity storage systems

Goal:

  1. Saving on the electricity bill
  2. Backup solution in case of a power blackout
  3. prevent grid pollution as caused by intermitting electricity sources

How:

  1. Prevent injection or feed-in of electricity coming from renewable energy sources to be fed into the public grid at low prices that afterwards need to be bought at higher prices.
  2. Charge batteries at low prices during off peak periods (Time of Use).
  3. Switch loads in order to maximize the availability of battery power (Demand Side Mgt)

What:

  1. There are DC or AC connected storage systems. In a DC connected system the PV panels are directly connected to the storage system, this is the most efficient system and is mainly done for installations where there was not yet a PV system installed or there was a PV system installed but the installed inverters need to be replaced.
    An AC connected system is a system that is connected to an existing PV system. This is also called a retrofit.
    AC connected storage system DC connected storage system
  2. There are grid connected or off-grid installations. Off-grid installations are mainly used when there is no grid available or for rural electrification. For Off-grid installations, the battery sizes are usually bigger and different inverters need to be used. On-grid installations are in general the most economical and most efficient.
  3. A full system consists out of batteries, chargers, inverters, power switches, a communication module and finally our so called ‘EFM system’ (EneRa propriatery name) or ‘electricity flow management system’ which also includes the battery management system. The EFM system controls and drives: the load, the charging, de-charging and maintenance of the battery and finally the electricity production.