2nd October 2019

solar-electric

17

# What should a fully charged 12 volt deep cycle battery read?

Voltage on a

**fully charged battery**will**read**2.12 to 2.15**volts**per cell, or 12.7**volts**for a**12 volt battery**. At 50% the**reading**will be 2.03 VPC (**Volts**Per Cell), and at 0% will be 1.75 VPC or less. Specific gravity will be about 1.265 for a**fully charged**cell, and 1.13 or less for a totally discharged cell.Similarly one may ask, how many cells are there in a 12v lead acid battery?

So a 12 volt battery will be made up of 6 individual cells connected in series and fitted into a single case or container. It follows that a 6 volt battery has

**3 cells**and an 8 volt battery has 4 cells. The typical 12 volt lead-acid battery has**6 cells**connected in series.What is the voltage of a fully charged car battery?

12.6 volts

2

## Can you use a regular battery charger on a gel battery?

**Do**not use

**gel**or

**gel**/

**AGM**settings, as they

**will**not fully

**charge**an OPTIMA

**battery**and

**could**damage it over time. However, even some

**AGM**-compatible

**chargers will**not

**recharge**deeply discharged (less than 10.5 volts) OPTIMA

**batteries**. For regular

**charging**, we recommend a maximum of 10 amps, 13.8 to 15.0 volts.

3

## What voltage to charge an AGM battery?

Deep Cycle AGM:- AGM batteries should be charged using a charger with a mode switch for AGM type batteries. It is recommended to use a charger, current limited to 20% or 0.2C of the batteries capacity at a charging voltage of between 14.6 –

**14.8V**following deep cycle use, or**13.6V**–**13.8V**for standby use.4

## What voltage is low for a car battery?

The best way to check battery charge is with a digital voltmeter. A fully charged battery should read

**12.65 volts**. A reading of**12.45 volts**equals about a 75% charge and is good enough for further testing. Anything less means the battery is low and needs to be recharged.5

## How much and how long will a 100ah battery operate?

This means that a battery has a 100 A.H. capacity if it is discharged over

**20 hours**, or at about 5 Amps-per-hour (100 A.H. /**20 hours**= 5 Amps DC). However, this same battery would last only**one hour**if the discharge rate was 50 Amps-per-hour (50 Amps DC x**1 hour**= 50 A.H.) because of the high rate of discharge.6

## What is the resting voltage of a car battery?

This is called the “open cell” or “resting” voltage of the battery. Resting fully charged

**12 volt**batteries are around 12.8-**12.9 volts**, and flat dead ones are at**12.0 volts**, so**12.4 volts**on a resting battery means it's about 50% charged.7

## How many amps are in a marine battery?

This deep-cycle marine/RV battery is rated for 500 MCA (marine cranking amps) and

**80 amp**-hours. The 140-minute reserve capacity indicates the number of minutes a battery can deliver**25 amps**of current without dropping below 10.5 volts.8

## Can you charge an AGM battery?

Some have different settings for charging flooded, gel and

**AGM batteries**. It's quicker to**charge**at higher amperage, but it also**can**generate a lot of heat, which reduces the life of a**battery**, just like the heat of summer. Alternators are NOT chargers. Don't rely on your alternator to**do**the work of a charger.9

## What kind of gas is given off as a battery is charged?

The charging of

**lead**-**acid**batteries can be hazardous. However, many workers may not see it that way since it is such a common activity in many workplaces. The two primary risks are from**hydrogen gas**formed when the battery is being charged and the**sulfuric acid**in the battery fluid.10

## How many volts is a 12 volt battery fully charged?

For instance, a

**6 volt**battery will have 3 cells (3 x2.2= 6.6 volts), a 12 volt battery will have 6 cells (6 x2.2=**13.2 volts**) and so on.That**2.2 volts**is the fully charged, straight off the charger number.11

## What are the advantages of an AGM battery?

AGM is

**maintenance**free, provides good electrical**reliability**and is lighter than the flooded lead-acid type. It stands up well to**low**temperatures and has a**low self**-discharge. The leading advantages are a charge that is up to five times faster than the flooded version, and the ability to deep cycle.12

## How many amp hours are in a deep cycle battery?

An amp hour (AH) is a rating usually found on deep cycle batteries. The standard rating is an amp rating taken for

**20 hours**. What this means for a 100 AH rated battery is this: Draw from the battery for**20 hours**, and it will provide a total of**100 amp hours**. That translates to about 5 amps an hour.13

## What is deep discharge?

A

**deep**-**cycle**battery is a lead-acid battery designed to be regularly deeply**discharged**using most of its capacity. In contrast, starter batteries (e.g. most automotive batteries) are designed to deliver short, high-current bursts for cranking the engine, thus frequently**discharging**only a small part of their capacity.14

## Can you use a deep cycle battery for starting a boat?

A

**deep cycle battery**on the other hand has much thicker plates and they are solid, not sponge. The warmer it is the more Cranking Amps a**battery will**produce. You**can use**a**Deep Cycle battery**as a**starting battery**provided that you**take**into account the lower CCA of a**Deep Cycle battery**.15

## How do you calculate amp hours for a battery?

The key is to use the watts you know to

**calculate**the**amps**at the battery voltage . For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5**hours**.**Amp**-**hours**(at 12 volts) = watt-**hours**/ 12 volts = 1470 / 12 = 122.5**amp**-**hours**.16

## What is the meaning of AH in battery?

An ampere hour (abbreviated

**Ah**, or sometimes amp hour) is the amount of energy charge in a**battery**that will allow one ampere of current to flow for one hour. An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor.17

## How many volts do you need to start a car?

Fully charged automotive batteries should measure at

**12.6 volts**or above. When the engine is running, this measurement should be**13.7**to**14.7 volts**. If you don't have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights.18

## How much is a RV battery?

RV Products.

With a wide variety of RV batteries to choose from, their prices range just as wide. The cheapest RV battery on the market is the Apex Group UI RV battery that costs

With a wide variety of RV batteries to choose from, their prices range just as wide. The cheapest RV battery on the market is the Apex Group UI RV battery that costs

**$48.25**, and the most expensive battery being a Lifeline GPL-8DA deep cycle RV battery for**$699.88**.19

## What is the charge voltage of a car battery?

This minimum charging voltage is

**13.8 volts**dc across the battery terminals, or at the output of the alternator. A single lead-acid cell starts to charge at anything over**2.25 volts**. Since a**12 volt**battery has six cells, any**12 volt**lead-acid battery needs at least**13.8 volts**to start to charge.