Re: REDUCING AMPERAGE for delicate electronics
It depends on the electronics... Most electronics are designed to run from a constant voltage system (like a battery or DC power supply). The only limitation in current is a fuse to protect the wiring if a short occurs.
The problem with many electronics systems is that they don't like voltages out side of a narrow range (5-10% at most). Even batteries have a much larger range of operational voltages --especially if you include the voltage required to recharge the batteries (example--a 12 volt storage battery need around 15 maximum volts, and your electronics should be able to run all the way down to about 10.5 volts for when the battery is discharged and to allow for wiring voltage drop).
The amount of energy of a lead acid battery is approximately proportional to its weight.
However, the amount of energy you can pull out of a battery also depends on its design and intended usage. Going outside of its designed usage will dramatically reduce its recharging life.
A car battery is designed to supply high current--but only for a short amount of time. It will only, reliably, support about a 20% discharge cycle. A car battery is designed to give high current at "low weight"--i.e., cheaply.
A wet lead acid storage battery will not give high starting current, but will support a 50% discharge cycle reliably. Weight is typically not an issue and the lead plates are more solid to support deeper and more discharge/charge cycles.
Some AGM lead acid batteries can support 80% depth of discharge reliably.
All lead acid batteries will fail quickly if stored in a discharged state (except some AGMs). And all Lead Acid batteries will produce extremely high amounts of current if shorted and must be treated with high respect.
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