INSTALLATION | Cabling and fusing
Doc #OI0003 Part #004122 Rev19 2014
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Battery Cabling Requirements
Minimum Recommended Copper Battery Cable Sizes per SP PRO inverter.
Total distance per conductor
from the SP PRO to the
battery terminals
Minimum Size Copper Battery Cables per inverter.
Based on cable loss < 2%
( V90 OR V-90HT INSULATION )
SPMC240
SPMC241
SPMC481
SPMC482
SPMC1201 SPLC1200,
SPLC1202
< 2 m
50 mm
2
70 mm
2
50 mm
2
50 mm
2
35 mm
2
50 mm
2
2 - 5 m
70 mm
2
50 mm
2
x 2 50 mm
2
70 mm
2
35 mm
2
50 mm
2
5 - 10 m
N/A
N/A
70 mm
2
70 mm
2
x 2 50 mm
2
70 mm
2
> 10 m
N/A - NOT RECOMMENDED
Battery Sense/Pre-charge
1.0mm
2
or greater, double insulated (see note)
V90 or V-90HT insulated cables are required to be spaced apart by at least the diameter of the
cable. For cables with higher grade insulation, no spacing is required.
The maximum temperature rating of the cabling within the unit needs to be considered.
Maximum temperature with cabling space is a30 degrees C.
In a multi phase installation, the total battery cable rating is multiplied by the number of
inverters in the system. For example in a three phase installation using three SPMC482
inverters, the minimum battery cable size with a length of 2m - 5m is 3 x 70 mm
2
or equivalent
Failure to follow cable size recommendations will reduce inverter performance to the published
specifications due to excessive voltage drops
Battery Sense / Pre-charge cable MUST be robust with solid insulation. DO NOT USE CAT5 or
equivalent cable.
Battery Fusing / Circuit Breakers
Recommended Battery Fuse or Circuit Breaker Sizes per SP PRO inverter.
The following recommendations MUST be adhered to for correct system operation. Failure to
follow the fuse / circuit breaker recommendations WILL lead to loss of power.
Product
SPMC240
SPMC241
SPMC481
SPMC482
SPMC1201
SPLC1200,
SPLC1202
Battery fuse / Circuit
breaker Rating per
inverter (A)
250
250
160
250
160
250
Battery Sense/Pre-charge
2A or greater (sized to protect wiring)
The DC Breaking Capacity (normally specified in kA at a maximum DC voltage) of the fuse
or circuit breaker must be greater than the maximum DC Short Circuit current for the sites
connect battery system.
In a multi phase installation, the total battery fuse / circuit breaker rating is multiplied by
the number of inverters in the system. For example in a three phase installation using three
SPMC482 inverters, the battery fuse size is 3 x 250A = 750A.
