3.2.1. Battery connection
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.
There is no safety fuse inside the inverter. A safety fuse should be installed externally.
See below table for the recommended battery cable cross section, safety fuse rating and battery capacity for each inverter model.
Inverter
model
Cable cross section
0-5m
Cable cross section
5-10m
Fuse rating
Battery capacity
12/1600
1 x 70mm²
Not recommended
250A
300 - 800Ah
24/1600
1 x 35mm²
1 x 70mm²
125A
150 - 400Ah
48/1600
1 x 16mm²
1 x 25mm²
60A
75 - 200Ah
12/2000
1 x 70mm²
Not recommended
300A
350 - 1000Ah
24/2000
1 x 50mm²
1 x 95mm²
150A
200 - 500Ah
48/2000
1 x 25mm²
1 x 50mm²
80A
100 - 250Ah
12/3000
2 x 95mm² (*)
Not recommended
400A
400 - 1200Ah
24/3000
1 x 50mm²
2 x 50mm² (*)
250A
200 - 700Ah
48/3000
1 x 35mm²
2 x 35mm² (*)
125A
100 - 400Ah
24/5000
2 x 95mm² (*)
2 x 95mm² (*)
400A
300 - 1500Ah
48/5000
1 x 70mm²
2 x 70mm² (*)
200A
150 - 700Ah
(*) One cable must be sized to carry the rated fuse current without overheating. Do not locate battery cables in a closed conduit.
Please follow local installation rules.
Sufficient cable thickness and appropriate sized batteries are an important factor. Please consult your supplier or see the relevant
sections of our books:
, both downloadable from our website.
Battery connection procedure
Use an insulated box spanner in order to avoid shorting the battery.
The maximum torque is 11Nm.
Avoid shorting the battery cables.
Proceed as follows to connect the battery cables:
• Be aware that reverse polarity connection (+ 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 tightly, while not exceeding the maximum 11Nm torque. A tight connection will reduce the
contact resistance as much as possible.
3.2.2. Solar connection
• Be aware that reverse polarity connection of the solar panel wires can cause damage to the inverter.
• Connect the solar panel cables to the positive (red) and the negative (black) PV terminals.
• Secure the PV connections tightly. A tight connection will reduce the contact resistance as much as possible.
3.2.3. Chassis to ground connection
Wire size for connecting the inverter chassis to ground:
The earth conductor from the earth lug on the chassis to ground should have at least half the cross-section of the conductors
used for the battery connection.
The earth lug on the chassis is a M6 bolt.
The AC output is not isolated from the DC input. The AC output Neutral is connected to chassis/ground. If the installation requires
a floating neutral, the neutral to ground link needs to be removed. See appendix
Installation information floating ground 1600VA
Installation information floating ground 3000VA and 5000VA models [21]
this.
Phoenix Inverter Smart Manual
Page 5
Installation
