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4.4.7 Parallel Connection of >1 eFlex battery
For a maximum battery bank size of 81KWH, up to 15 eFlex batteries can be connected in parallel.
All wires should be an appropriate gauge and constructed to handle the loads that will be placed upon
them. Heavy gauge, fine strand copper wire is the industry standard due to its stability, flexibility,
efficiency and overall quality. A qualified installer should understand this and must adhere to the
industry standard and published electrical guidelines.
The storage capacity and total permissible charging and discharging amperage are increased by the
parallel arrangement. The illustration below shows how to connect multiple batteries in parallel.
Please note the overall voltage is not changed. The available amperage from the system is increased
with each additional parallel battery. In a parallel system with two batteries, the available charging
and discharging amperage is doubled compared to a single battery.
Prior to installation: check all battery voltages independently.
Make sure the
voltage difference between the highest voltage and lowest voltage battery is
less than
1V to ensure trouble-free start-up of the whole system.
The schematic below illustrates the proper paralleling of eFlex batteries. The best way to ensure
proper cell balancing and longevity is by using common positive and negative bus bars and connect
each battery to the bus bar individually. In addition, it is good practice to install a 150A Overcurrent
Protection Device on the positive terminal of the battery as a precaution.
