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What Wattage is too expensive?
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<blockquote data-quote="mat3833" data-source="post: 8823923" data-attributes="member: 587645"><p>Yes, you are correct. Power is volts times amps. But 12v X 300a for 5 seconds is less than 12v X 100a for 30 minutes. My point was simply a simple 5 second jump isn't the same power as 30m of my system at decent volume. Yes, starting is alot of current, but part of that is due to battery resistance and wire loses causing voltage drop. Lower voltage means more amps for the same power output.</p><p></p><p>I'd love to get some kind of meter and find out how much power my jetta takes to turn over, I highly doubt it's anywhere close to the "950cca) the factory battery was rated for. When starting my car now, my voltage doesn't even drop from the resting 14.3 or so.</p><p></p><p>Matt</p><p></p><p>Edit: also, lithium batteries are MUCH better suited to heavy load situations. Most AGM or lead-acid batteries only support 50 percent depth of discharge. That means your 40ah battery is only good for 20ah in real world use. Lithium are generally good for upwards of 80 percent, and they maintain their voltage in a much flatter discharge curve. Lithium is all aroind just better.</p></blockquote><p></p>
[QUOTE="mat3833, post: 8823923, member: 587645"] Yes, you are correct. Power is volts times amps. But 12v X 300a for 5 seconds is less than 12v X 100a for 30 minutes. My point was simply a simple 5 second jump isn't the same power as 30m of my system at decent volume. Yes, starting is alot of current, but part of that is due to battery resistance and wire loses causing voltage drop. Lower voltage means more amps for the same power output. I'd love to get some kind of meter and find out how much power my jetta takes to turn over, I highly doubt it's anywhere close to the "950cca) the factory battery was rated for. When starting my car now, my voltage doesn't even drop from the resting 14.3 or so. Matt Edit: also, lithium batteries are MUCH better suited to heavy load situations. Most AGM or lead-acid batteries only support 50 percent depth of discharge. That means your 40ah battery is only good for 20ah in real world use. Lithium are generally good for upwards of 80 percent, and they maintain their voltage in a much flatter discharge curve. Lithium is all aroind just better. [/QUOTE]
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