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CONTROLLERS AND MONITORING SYSTEMS 869<br />

mx<br />

m2<br />

m1<br />

S<br />

Controller<br />

Figure 19.5<br />

Partial-shunting controller for high-voltage systems<br />

D1<br />

D2<br />

D3<br />

m1 m2 m3<br />

S1<br />

S2<br />

Controller<br />

S3<br />

Figure 19.6<br />

Sub-array switching controller for high-power systems<br />

In consequence, the remaining generator voltage is too low to further charge the battery.<br />

The advantage of partial shunting is the reduced voltage stress for the switch in highvoltage<br />

systems. On the other hand, a tap and additional wiring are needed.<br />

In high-power systems, sub-array switching according to Figure 19.6 is used for<br />

charge control. The PV generator is set up as a number of sub-arrays (strings), and each<br />

of these strings is connected to the battery via its own control element (e.g. blocking<br />

diode and switch).

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