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CONTROLLERS AND MONITORING SYSTEMS 867<br />

3<br />

OP 1<br />

OP 2<br />

OP 3<br />

I m /A<br />

2<br />

E = 1000 W/m 2<br />

T mod = 50°C<br />

P 1<br />

P 2<br />

P 3<br />

1<br />

0<br />

0 5 10 15 20<br />

V m /V<br />

Figure 19.3 I –V curve of a 36-cell PV module and characteristic curve of a 12-V lead acid<br />

battery with 3-m input lead (1.5 mm 2 cross-section) for three different charging currents. The<br />

shaded areas show the power dissipated in the control element<br />

S1<br />

m1<br />

Controller<br />

(a)<br />

D1<br />

m1<br />

S1<br />

Controller<br />

(b)<br />

Figure 19.4<br />

Principle of (a) series and (b) shunt controllers<br />

no problems with electromagnetic compatibility (EMC), and the battery will be charged<br />

with a life-extending CC without micro-cycles.<br />

19.1.1.3 Switching controllers<br />

The above-mentioned disadvantage of intensive heat dissipation in linear charge controllers<br />

can be overcome with switching controllers. In these controllers, the control<br />

element is either fully closed (conducting) or fully open (blocking). Under ideal conditions,

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