Connection to the battery
In order to fully utilize the full capacity of the inverter, it is important to use batteries with sufficient capacity and battery cables with sufficient cross section.
The inverter is fitted with an internal DC fuse. If the battery cable length is more than 1.5m, an additional fuse or DC circuit breaker must be added to the battery cable, located close to the battery.
See below table for the recommended battery cable cross section, internal fuse information and the minimum recommended battery capacity for each inverter model.
Inverter model | Cable cross section 0-1.5m | Cable cross section 1.5-3m | Internal fuse (Littelfuse) | Fuse replaceable? | Minimum battery capacity |
|---|---|---|---|---|---|
12/250 | 4mm² | 6mm² | 2 x 30A, 32V, ATOF | No | 30Ah |
24/250 | 2.5mm² | 4mm² | 30A, 32V ATOF | No | 20Ah |
48/250 | 1.5mm² | 2.5mm² | 25A, 80V, FKS | No | 10Ah |
12/375 | 6mm² | 10mm² | 2 x 40A, 32V ATOF | No | 40Ah |
48/375 | 2.5mm² | 4mm² | 25A, 80V, FKS | No | 15Ah |
12/500 | 6mm² | 10mm² | 3 x 35A, 32V, ATOF | No | 60Ah |
24/500 | 6mm² | 10mm² | 2 x 30A, 32V, ATOF | No | 40Ah |
48/500 | 4mm² | 6mm² | 30A, 80V, FKS | No | 20Ah |
12/800 | 16mm² | 25mm² | 150A, 32V, BF1 | Yes | 100Ah |
24/800 | 6mm² | 10mm² | 80A, 32V, BF1 | Yes | 50Ah |
48/800 | 4mm² | 6mm² | 40A, 58V, BF1 | Yes | 30Ah |
12/1200 | 25mm² | 35mm² | 200A, 32V MIDI | Yes | 150Ah |
24/1200 | 10mm² | 16mm² | 100A, 32V MIDI | Yes | 60Ah |
48/1200 | 6mm² | 10mm² | 50A, 58V, MIDI | Yes | 30Ah |
12/1600 | 35mm² | 50mm² | 250A, 32V, MEGA | Yes | 200Ah |
24/1600 | 16mm² | 25mm² | 150A, 32V, MIDI | Yes | 100Ah |
48/1600 | 10mm² | 16mm² | 80A, 58V, MIDI | Yes | 60Ah |
Sufficient cable thickness and appropriately sized batteries are important factors. Please consult your supplier or see the relevant sections of our books: Energy Unlimited and Wiring Unlimited, both downloadable from our website.
Battery connection procedure
Warning
Use insulated tools in order to avoid shorting the battery terminals.
Avoid shorting the battery cables.
Proceed as follows to connect the battery cables:
Be aware that reverse polarity connection of the battery cables (+ to – and – to +) will cause damage to the inverter.
Connect the battery cables to the + (red) and the - (black) battery terminals.
Secure the battery connections firmly to minimise contact resistance. Refer to the recommended torque values in the table below:
Inverter model | Maximum cable cross section (m²) | Maximum cable cross section (AWG) | Recommended torque (Nm) | Torque (Lb.in) |
|---|---|---|---|---|
12/250 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
24/250 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
48/250 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
12/375 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
24/375 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
48/375 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
12/500 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
24/500 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
48/500 | 10mm² | 8 AWG | 1.2Nm | 11 Lb.in |
12/800 | 25 m² | 4 AWG | 2Nm | 18 Lb.in |
24/800 | 16m² | 6 AWG | 2Nm | 18 Lb.in |
48/500 | 16m² | 6 AWG | 2Nm | 18 Lb.in |
12/1200 | 35mm² | 2 AWG | 4.3Nm | 38 Lb.in |
24/1200 | 25mm² | 4 AWG | 2Nm | 18 Lb.in |
48/1200 | 25mm² | 4 AWG | 2Nm | 18 Lb.in |
12/1600 | 50 mm² | 1/0 AWG | 4.3Nm | 38 Lb.in |
24/1600 | 25mm² | 4 AWG | 2Nm | 18 Lb.in |
48/1600 | 25mm² | 4 AWG | 2Nm | 18 Lb.in |