General exam question G4E11
Subelement G4, AMATEUR RADIO PRACTICES· Group G4E
What precaution should be taken when connecting a solar panel to a lithium iron phosphate battery?
- A.Ground the solar panel outer metal framework
- B.Ensure the battery is placed terminals-up
- C.A series resistor must be in place
- D.The solar panel must have a charge controller (correct answer)
WhyA solar panel charging a lithium iron phosphate battery must have a charge controller. Lithium iron phosphate cells need carefully controlled charge voltage and current to charge safely and avoid damage, so a solar panel charging one must go through a charge controller matched to that chemistry rather than being wired straight to the battery, answer D. Grounding the panel frame, terminal orientation, and an unspecified series resistor don't address the real requirement, proper charge regulation for the battery chemistry involved.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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