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Cedar Rapids, Iowa | You are correct. If you have a constant load, a battery isn't going to be of much value. The benefit is when you have a high amperage load that doesn't run very much. In that case, it will pull electricity from the near battery. As the voltage of that battery drops, it will also start pulling electricity from the main battery. The size and length of the feeder wire (and thus its resistance) will limit how much current can flow to that battery to keep it recharged.
If you hook up a system like this, make sure you put a fuse in the wire going between the batteries. Possibly even a diode so the main battery can't drain the auxiliary battery.
The car audio guys have been doing this kind of stuff for years. Due to the high amperage draw of an amplifier, they want good clean power close to the amp. Sometimes a battery is used, but a capacitor also works very well for what they are doing. In the case of ag related stuff, the high amperage loads usually run for more than a split second, so a battery would be a better choice than a capacitor. | |
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Battery to prevent voltage drop
