Can an SP20 or SP20-PW solar panel be put in series to produce 40 W at peak output, similar to how the SP50-L can produce 100 W?
The SP20 or SP20-PW solar panels can be connected in parallel (not series) to get more energy out during the day, or to extend the hours of charging (one facing east and one facing west). To accomplish this using a PS100/CH100, use the full-bridge diodes inside the PS100/CH100 as blocking diodes to prevent a shaded panel from loading down a non-shaded panel. Note that the PS100 charging current is limited to 1.2 A, thus the full benefit of both panels in full sun may not be realized.
- Connect the two separate positive outputs to the two separate charge inputs.
- Connect both return wires to the PS100/CH100 ground terminals.
The diagram below illustrates how to connect two 20 W panels:
Another method, using two blocking diodes, can be used with the PS200/CH200 charge controller:
For more information, contact an application engineer at Campbell Scientific.
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