Solar Power Solution

How would you test the amp-hour rating of a battery?

I have a battery that will last for the 40Ah, but I do not think that the really one 40Ah battery is not because their lasting as long as it should. Is there any way that I can test the amp hour battery? What equipment would this? I would not mind spending a little money for testers, because I have a battery, the need is so small and lite as possible, which displays 40Ah. If I spend a little money and a set of test batteries would be worth it to me.

We test batteries everyday at work. For a lead-acid battery, the amp-hours Capacity of a battery is defined as the constant current that the battery will discharge in 20 hours fully charged at 20 ° C. In general, is something like 2.2 V discharged per cell and completely defined than 1.75 V per cell definition (depending on the manufacturer). If you drain your battery faster than 20 hours, your amp-hour rating is less than the 20-hour value. If you discharge the battery, the slower is greater than the 20-hour value. Batteries perform less well in terms of capacity at low temperatures. They also have less capacity over time. Note that many batteries) (eg car batteries are designed to fully discharged, and he repeatedly will reduce their lifespan. As for the equipment, there are a number of ways to measure the capacity. We have current sources of labor that a fixed power operation. We simply monitor the voltage and current while the battery is discharged. You can then multiply the current time to time, ampere-hours. If you have no power source have (they are a specialty piece of equipment), I would be a resistance load (battery voltage does not change so much) and a voltage monitor. Knowledge battery voltage versus time and resistance, you can determine the power consumption versus time. Then you can get the current course of time, Amp-hours.

Kenny Rogers & Dolly Parton – Islands In The Stream (Live)