With higher current flowing through the system, you have more I²R losses, which translates to heat and inefficiency. Conversely, raising the voltage can cut down these losses considerably. Consider the likes of Tesla or SolarCity; their commercial installations often shoot for.
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Yes, a battery can have voltage and no amps. This occurs when there is no closed circuit or load connected, meaning no current (amps) is flowing despite the battery holding a potential difference (voltage).
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The DC cabinet is mainly to aggregate and share the current distribution of each battery rack to. Download scientific diagram | Typical discharge curves of: (a) LFP cell; (b) NMC cell. from publication: Battery Models for Battery Powered Applications: A.
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The answer is yes, it is possible for a car battery to have voltage but no amps, indicating a lack of current flow. Use a battery load tester to apply a load to the battery and measure the voltage drop.
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