Accessories for solar batteries

Battery accessories are the components that ensure a battery bank operates safely: interconnections between modules, monitoring, mechanical support and protection. In a lithium-ion installation, a large proportion of commissioning problems stem not from the battery itself but from the way it is connected.

What accessories do I need to set up a battery bank?

• Interconnect cables: of a suitable cross-section and of equal length between modules, so that they all operate at the same resistance and share the current equally.
• Quick-connect power connectors: such as the 25 mm² terminals in the ZYC and SIMPO series, which prevent poorly crimped terminals.
• Stands and bases: The bench must be secured. A 50 kg lithium battery pack left loose in a van is a projectile.
• Communication and monitoring modules: such as the Wi-Fi on the ZYC and SIMPO, to check the status without having to connect a cable.
• Specific fasteners: the M10 kits for the Lynx systems, with the correct tightening torque.

Why do all the cables on the bench have to be the same length?

Because current follows the path of least resistance. If one module is connected by a shorter cable than the others, it carries more current in each cycle, wears out sooner and eventually throws the whole system out of balance.

The standard solution is the diagonal connection: the positive terminal of the system at one end of the bank and the negative terminal at the other, so that the total length is the same for all modules.

Do the terminals need to be tightened with a torque wrench?

Yes, and it’s one of the most overlooked issues. A loose terminal creates contact resistance, and that resistance generates heat in proportion to the square of the current. It is the number one cause of blown terminals in 12 V systems.

Tightening it too much isn’t good either: it can warp the terminal or damage the post. Each manufacturer specifies the correct torque in the manual, and it’s advisable to retighten after a few months after installation, as the materials settle.

See also the battery monitors and the fuses the bank’s protection.