Photovoltaic systems are divided into two types: network interconnected and isolated. The interconnected systems are connected to the power grid using your energy service provider as a backup when the generated energy is not enough, and isolated systems require batteries to store energy to use when there is no sun.
The battery bank connection will depend on your voltage and the voltage configure on the controller. In EPCOM® we offer the PL-110-D12 battery from our own epcom® POWER LINE (designed for photovoltaic systems) of 110 Ah to 12 V, it can be connected to a controller configured to 12 V. To maintain this voltage, the batteries are connected in parallel as shown below, this way the voltage will be the same as each individual battery. Afterward, connect the last terminals directly to the controller respecting the polarity.
If you require a 24 V configuration, connect two batteries in series to increase the voltage, in series we add the voltage of each battery, and afterward, we connect them in parallel to maintain 24 V and guaranteeing the required storage capacity. The battery terminals that are not connected to anything in the image below 8are the terminals we will use to connect the batteries in parallel with the other series.
For a 48 V configuration, it is the same as the previous connection, only in this case we connect four batteries in series.
On the image below you can view the different configurations that you made need:
Lastly, at the moment we connect the battery bank to the controller we must have the positive from the first battery and negative from the last battery, this is done so that the energy flows through all of them and the batteries evenly discharge.
To make the required connections we offer different cables from our epcom® POWER LINE:
- CBL-AWG2-0.2R and CBL-AWG2-0.2B: These cables have a length of 0.2 m in and 2 AWG, they are used for parallel connections when the configuration is for 12 V. They are red and black, respectively to distinguish the poles.
- CBL-AWG2-1R and CBL-AWG2-1B: These ables have a length of 1 m and 2 AWG, they are used for series connection when the distance is larger, for example in 24 V and 48 V configurations. They are in red and black respectively.
- CBL-2AWG-2.2B: This cable has a length of 2.2 m and 2 AWG. Used for larger distance connection between batteries. Blue color
- CBL-8AWG-3R and CBL-8AWG-3BLK: These cables are used to connect the bank batteries to the controller, eye terminal only on one end of the cable. 3-meter length, 8 AWG.