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An RV owner's best tool. A multimeter.

A multimeter is a very valuable tool. Usable meters start at about $50. The better the meter, the higher the cost. A multimeter will offer many answers
for anything electrical. A multimeter will indicate battery condition, if all the fuses are good and if the AC power is sufficient to use. When a battery indicates 12.0volts, the battery is discharged 75%. A full ready to work battery will show 12.6volts on a multimeter. To keep an RV battery always ready to work, get a small battery charger with a 20-50 amp output, get a 24 hour time clock. Hook up the charger to the battery, plug into the timer, set the timer to go on for a couple hours and off for about 3 hours. This method works on any battery. Some folks connect the converter, also known as a battery charger, and allow the timer to control the charging. A 12volt test lite is a handy tool for an RV too. Frank
 

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FRANK-ID: I feel 20 amps max are sufficient, even ten might do. Why would you choose such a short "off" time when you don't know if the battery is in fact supplying power to a considerable load?
 

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I'm not sure of your words.

Adjusting a time clock to charge a battery is a time vs rate calculation. A long slow charge is usually for the battery as little charge is lost as heat.
Remember the mulitmeter is a great tool. Frank
 
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