Quick Answer: How Low Can You Discharge A Deep Cycle Battery?

How do I know if my deep cycle battery is bad?

How to Know If a Deep Cycle Battery Is BadDo a visual inspection of the battery.

Charge the battery fully before testing.

Have a copy of the manufacturer’s specifications for the battery nearby, as you will need to refer to them as you test the battery.Take a hydrometer reading of all the cells in the battery.More items….

Can a car alternator charge a deep cycle battery?

It could take quite some time to fully charge the deep cycle battery. … Also if the deep-cycle battery is very discharged it might not have enough voltage to prime the alternator. The alternator and it’s voltage regulator need like 6 volts to even begin to perk.

How far should you discharge a deep cycle battery?

Depth of discharge, also known as DOD, shouldn’t be any more than 50% in most deep cycle batteries in order to get the best value for money. So if you have a 100 AH battery, consider the cut-off discharge depth being 50 AH.

What is the lowest voltage for a deep cycle battery?

10.5 voltsThe lowest limit is 10.5 volts (used in testing) and obviously unsatisfactory in practical use. Experienced RVers try to use no more than 20% to 50% of the energy available in a battery before recharging. That means they never let resting voltage get below 12.5.

Can you overcharge a deep cycle battery?

Both overcharging and undercharging will have serious adverse effects on the lifespan of a deep cycle battery. In particular, you can seriously shorten the lifespan of a battery if it is used in a deep cycle application that it was not designed for.

How long will a 100ah battery run a fridge?

1000 hoursTherefore a 100ah (amp hour) battery will last for 1000 hours. A slightly different example is a 60 watt fridge running on a 12 volt power source uses 60 /12 = 5 amps, but only while the motor runs.

When should I charge my deep cycle battery?

Batteries should be fully charged after each use. “Use” is defined as 30 minutes or more of runtime. Before charging, make sure the charger is set to the appropriate program for deep cycle flooded/wet, AGM, or Gel batteries. Charging time will vary depending on battery size, charger output, and depth of discharge.

How low can you discharge a AGM battery?

The leading advantages of AGM are a charge that is up to five times faster than the flooded version, and the ability to deep cycle. AGM offers a depth-of-discharge of 80 percent; the flooded, on the other hand, is specified at 50 percent DoD to attain the same cycle life.

Should you completely discharge a deep cycle battery?

Automotive batteries will generally fail after 30-150 deep cycles if deep cycled, while they may last for thousands of cycles in normal starting use (2-5% discharge). Deep cycle batteries are designed to be discharged down as much as 80% time after time and have much thicker plates.

What happens if a deep cycle battery goes flat?

If your battery shows a good voltage when it’s fully charged, but quickly drops voltage to 11V or less when using power, this usually means the battery has a faulty cell and needs replacement. … When a deep cycle battery is fully discharged (dead flat), it should reveal a reading of approximately 10.5V.

What should a 12 volt AGM battery read when fully charged?

So a 12volt battery will measure at about 12.9 volts when it’s fully charged and about 11.4 volts when it is fully discharged. That’s a total of 1.5 volts that represents the full range of charge on a 12volt battery.

Can a AGM battery explode?

The simple fact is that, given the right conditions, an AGM battery can, and will, start a self-perpetuating internal heating process (thermal runaway) that can end in catastrophic failure with the possibility of fire and explosion.

Can I use a trickle charger on a AGM battery?

Severely discharging and leaving the battery discharged can cause harm and shorten life in AGM batteries. … If you’re not going to use the battery for a week or more at a time, we highly recommend a charger maintainer (also called a trickle charger) to keep the battery from discharging.

How often should I charge my deep cycle battery?

Equalization Charges Batteries should be equalized occasionally to make sure each cell is equally charged. Apply a controlled overcharge once every 30-90 days, or whenever individual batteries are imbalanced (reading a different voltage or specific gravity). Check water level before initiating an equalize charge.