Has anyone run short of power? If not, keep it stock. FWIW, my 100 alternator was 80 amps and never had a problem with it keeping a high demand dual battery system fed.
Regarding the 5A charging rate... There's (up to) 180A going to the battery. The 5A is the battery voltage sensing line that controls alternator output. Electrical systems are battery fed but alternator charged. We have a (roughly) 14V electrical system with a (roughly) 12V battery. The system operates at 14V when the truck is running which is sufficient to both provide for electrical demands and charge the battery. The system drops back down to a 12V (technically 12.6-12.8V) resting voltage when the engine is off.
All that said, the system will supply as much power as required to charge the battery (or more specifically, to attain the system cutoff voltage). 5A would be a horrible charge rate.
Regarding the 5A charging rate... There's (up to) 180A going to the battery. The 5A is the battery voltage sensing line that controls alternator output. Electrical systems are battery fed but alternator charged. We have a (roughly) 14V electrical system with a (roughly) 12V battery. The system operates at 14V when the truck is running which is sufficient to both provide for electrical demands and charge the battery. The system drops back down to a 12V (technically 12.6-12.8V) resting voltage when the engine is off.
All that said, the system will supply as much power as required to charge the battery (or more specifically, to attain the system cutoff voltage). 5A would be a horrible charge rate.
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