Dyness Knowledge | The Solution of Storage Ready
Introduction
Storage Ready, also called “Battery Ready”, is for inverters.
Because a pure photovoltaic inverter cannot be connected to a battery, once there is a need for energy storage in the future, an energy storage inverter will need to be installed, which will increase the user's cost. In response to this pain point, "Storage Ready" came into being. Inverters with this function have reserved battery interfaces, which can reduce customers’ costs when upgrading energy storage.
There are two common Storage Ready solutions
There are generally two transformation methods:
Method 1: Transform the MPPT module into a bidirectional DC/DC module
This transformation method is more suitable for photovoltaic inverters with multiple MPPT modules. Convert one of the MPPT modules into a bidirectional DC/DC module. In the early stage when energy storage is not needed, the bidirectional DC/DC module is connected to the photovoltaic string. When there is a subsequent need for energy storage, the DC/DC module is connected to the battery.
Method 2: Lead the battery interface through the DC bus
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This modification method can adapt to the equipment modification of a single MPPT module. However, because this inverter does not have a built-in bidirectional DC/DC module, it generally requires a built-in DC/DC module in the battery system. The battery systems on the market generally do not have DC/DC modules, so most suppliers that generally use this method provide supporting batteries.
Because photovoltaic inverters generally do not have built-in off-grid functions, when performing "storage ready" transformation, it is often necessary to purchase additional off-grid power supply external equipment and other supporting equipment.
The hybrid inverter itself has an off-grid port, the overall changes are small, and it is generally implemented using software restrictions. When the energy storage system is subsequently installed, the battery function will be activated through software upgrades and other methods.
This system is suitable for users with clear subsequent energy storage needs. Because the cost is basically the same as that of hybrid inverters, it will be difficult to promote it in cost-sensitive areas.
The above two Storage Ready solutions, to a certain extent, avoid the cost of purchasing additional energy storage inverters when adding battery systems later. Such needs are common in countries and regions in the early stages of photovoltaic development.
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