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SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.

SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.

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SMA Solar Technology AG Electrical Connection<br />

6.2.1 Safety Precautions/Conditions<br />

Connect a suitable battery to the DC side (see section 22 ”<strong>Technical</strong> Data” (page 217)). DC must be<br />

connected observing all local valid guidelines and regulations.<br />

DANGER!<br />

Death hazard due to inappropriate handling of the battery. Death or serious<br />

chemical burns.<br />

• All safety and maintenance instructions provided by the battery manufacturer must<br />

be observed.<br />

• Use special (insulated) tools to mount and install the battery.<br />

6.2.2 Cable Sizing<br />

Be sure to observe all standards applicable to the installation site for sizing the cable.<br />

DIN VDE 0298-4 applies in Germany.<br />

Size the battery cables as short as possible. Long cables and insufficient cable diameters reduce<br />

system efficiency and overload capabilities.<br />

Example for Cable Sizing<br />

At an AC output of 5000 W and a battery voltage of 48 V, a current of up to 140 A flows through<br />

the battery cable.<br />

The current flowing through the battery cable causes a power loss and a drop in voltage with every<br />

meter of plain battery cable. You can use the following table to find the power loss and voltage drop<br />

associated with different cable cross-sections.<br />

Cable cross-section Power loss Voltage drop<br />

35 mm 2 12 W/m 90 mV<br />

50 mm 2 8.5 W/m 60 mV<br />

70 mm 2 6 W/m 45 mV<br />

This means that:<br />

For a 10-meter distance between the <strong>Sun</strong>ny Island and the battery, at least 20 m of cable are needed.<br />

Using a cross section of 50 mm², 140 A (current flowing through the battery cable) cause a power<br />

loss of 170 W in total and an effective voltage drop of 1.2 V.<br />

<strong>Technical</strong> <strong>Description</strong> SI<strong>5048</strong>-TB-TEN110340 33

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