There's a few ways to look at it, total energy storage, amperage output, and recharge speed. They kind of go in am inverse relationship, based on an equal dollar amount spent.
For example, a loose approximation of equal units for either a bank of 6 supercaps, a 20 ah LiFePO4 cell bank, or a 120ah AGM cell bank.
.5*C*V*V gives 250kJ for a cap bank, 936kJ for a bank of 3000F caps, and 5,616 kJ for the AGM. All assuming 13V.
Then we have big differences in the speed at which the cells release energy, and at what voltage they deliver the current at based on a known curve of current vs voltage. Where one bank of caps can deliver 1200 amps with pretty linear voltage sag, a LiFePO4 has a higher voltage under load than a standard battery, but dollar for dollar can provide less current than a supercap. Last an AGM "loses its float charge" quickly, but provides good current for the price.
Last is recharging, in which case the supercaps will accept more energy the fastest, LiFePO4 cycles next fastest, and the AGM charges the slowest relative to the others, sometimes more so in a battery with thick internal plates or higher internal resistance.
So what does this all mean for amplifiers? Most important thing for an amplifier is to receive current on demand, in its rated voltage range. Since music is dynamic current demands vary over time, burst charging cycles are inherently build in. Some modified music, however, has long current draw demands and exceeds even the most capable charging systems for certain periods.
With these factors in consideration, caps have the best current capacity, but require large numbers of banks to provide enough reserve or higher charging rates from bigger/multiple alternators to keep up with total energy demand. Supercapacitors have a very good overall lifespan, and sometimes very good deals come up on un abused banks. LiFePO4 has slightly less current on demand, but a favorable discharge curve with higher average voltage through all its energy output. Charging is very efficient but for the money, it's still expensive to get a decent reserve for the times when demand exceeds charging. AGM, is a heavy but we'll tested energy source, with decent current capability to voltage, and by far the most energy stored. The charging speeds leave something to be desired, but once you hit a duty cycle voltage on an AGM, you can stay there for a long time.
All three options have voltage options, 12V, 14V, and 16V. And they all work well together. So unless you have specific concerns like weight, or budget, I would say we should use all of them together as their best attributes are complimentary and do not take away from the performance of each other.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.