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Time for a beefier alt, or do I need another battery?
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<blockquote data-quote="Lasherž" data-source="post: 8705368" data-attributes="member: 679555"><p>I don't know who argued that it wouldn't, but even that is a bit misleading. The voltage determines the source(s) utilized. If they're not matched the higher voltage source will be the primary until the voltage drop of the system is sufficient to utilize the other source, at which point they'll both be the source. Until that happens the battery is a load, not a source.</p><p></p><p>You're correct, some old alternators had their own voltage regulators but since some ECUs do complicated things with the charging system for efficiency/EPA standards they've taken over the duty of regulating the current from the alternator. The battery is being monitored primarily for the current to and from the battery, but some modern cars also measure temperature, voltage, as well as current. They use this to check the health of the battery and to shed loads or make decisions about whether to disable start-stop and other features reliant on the battery or when to charge it for maximum efficiency. Cold batteries charge faster and so the ECU often prioritizes early charging, but will let the voltage sag a little when the engine compartment is hot.</p><p></p><p>I don't think anyone argued that it was the only source of power in any situation so long as the engine on, the battery isn't a source though until the current rating of the alternator is exceeded which is quite rare in most cars. That doesn't mean it's not important during that time though since it stabilizes the voltage of the car.</p><p></p><p>Again, batteries both stabilize and provide power when the alternator ratings are exceeded. With audio systems that's common, but with regular cars it's not.</p><p></p><p>Who argued they were?</p><p></p><p>The motherboard already bypasses the battery for powering the CMOS for date/time and when the computer's got ATX power, just never unplug it and pray to the power company gods to keep the juice flowing.</p><p></p><p>What you're describing is a generator with a battery charger plugged into it.</p></blockquote><p></p>
[QUOTE="Lasherž, post: 8705368, member: 679555"] I don't know who argued that it wouldn't, but even that is a bit misleading. The voltage determines the source(s) utilized. If they're not matched the higher voltage source will be the primary until the voltage drop of the system is sufficient to utilize the other source, at which point they'll both be the source. Until that happens the battery is a load, not a source. You're correct, some old alternators had their own voltage regulators but since some ECUs do complicated things with the charging system for efficiency/EPA standards they've taken over the duty of regulating the current from the alternator. The battery is being monitored primarily for the current to and from the battery, but some modern cars also measure temperature, voltage, as well as current. They use this to check the health of the battery and to shed loads or make decisions about whether to disable start-stop and other features reliant on the battery or when to charge it for maximum efficiency. Cold batteries charge faster and so the ECU often prioritizes early charging, but will let the voltage sag a little when the engine compartment is hot. I don't think anyone argued that it was the only source of power in any situation so long as the engine on, the battery isn't a source though until the current rating of the alternator is exceeded which is quite rare in most cars. That doesn't mean it's not important during that time though since it stabilizes the voltage of the car. Again, batteries both stabilize and provide power when the alternator ratings are exceeded. With audio systems that's common, but with regular cars it's not. Who argued they were? The motherboard already bypasses the battery for powering the CMOS for date/time and when the computer's got ATX power, just never unplug it and pray to the power company gods to keep the juice flowing. What you're describing is a generator with a battery charger plugged into it. [/QUOTE]
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Time for a beefier alt, or do I need another battery?
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