Common misconceptions when designing energy storage systems

1. Focus on battery capacity only
2. standardization of kw/kwh ratio in all application scenarios (no fixed ratio for all scenarios)

In order to achieve the goal of reducing the average cost of electricity (LCOE) and improving system utilization, when designing PV energy storage systems based on different application scenarios, two core components need to be taken into account: the PV system and the battery system. OSM introduces removable and stackable batteries of 8.4kwh per module, which can be stacked according to customer requirements to reach 16.8kwh, 25.2kwh 33. kWh, 42kwh, can meet most of the market demand for household electricity, assembly is also very convenient, does not take up space in the garage, the basement is a good choice.

The precise selection of a PV system versus a battery system requires consideration of the following.

Solar radiation level

The intensity of local sunlight has a great influence on the choice of PV system. And from the point of view of electricity consumption, it is desirable for the PV system to have a generating capacity sufficient to cover the daily household energy consumption. Regional data on sunlight intensity and other relevant data are available on the web.

 

System efficiency

In general, there is a power loss of about 12% for a complete PV energy storage system, consisting mainly of the following.

  • DC/DC conversion efficiency loss
  • Battery charge/discharge cycle efficiency loss
  • DC/AC conversion efficiency loss
  • AC charging efficiency loss

There are also a variety of unavoidable losses during system operation, such as transmission losses, line losses, control losses, etc. Therefore, when designing a PV energy storage system, you should ensure that the designed battery capacity can meet the actual demand as much as possible. Energy storage battery OSM battery company currently provides 5KWH, 10KWH, wall-mounted style and stacked style energy wall. These products can meet the needs of household energy storage.
Taking into account the overall system power loss, the actual required battery capacity should be
Actual demanded battery capacity = designed battery capacity / system service

Parameter Matching

When designing an energy storage system, it is very important that the same parameters of the inverter and battery are matched. If the parameters do not match, the system will follow a smaller value to operate. Especially in standby power mode, the designer should calculate the battery charge/discharge rate and power supply capacity based on the lower values.

Available Battery Capacity

The “battery capacity” and “available capacity” in the battery parameter table are important references for designing energy storage systems. If the available capacity is not indicated in the battery parameters, it can be calculated by the product of the battery depth of discharge (DOD) and the battery capacity. When using a battery with an energy storage inverter, it is important to pay attention to the depth of discharge in addition to the available capacity, because when used with a specific energy storage inverter, the preset depth of discharge may not be the same as the depth of discharge of the battery itself.