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Reserve capacity to amp hours calculator

Battery Sizing There are a number of different standards for rating battery energy storage capacity. Automotive starting batteries are normally rated by cranking amps. This is not a relevant rating, for continuous use. Deep-cycle batteries are rated either by reserve capacity in minutes or by ampere-hour capacity. Battery reserve capacity is a measure of how long a battery can deliver a certain amount of current - usually 25 amperes.


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WATCH RELATED VIDEO: Off-grid battery bank capacity: amp-hours vs watt-hours

Reserve Capacity


Remember Me? Private First Class. Appreciate 0. Multiply the reserve capacity minutes by 25 then divide by Originally Posted by tke Both relate to battery capacity, however they each answer a different question about the battery. Originally Posted by PDXi. Battery ratings are not too complicated but it's more of a curve than linear relationship.

Lead acid batteries will act differently with varying loads. A battery rated at amp-hours over 6 hours might be rated at AH at the hour rate, and AH at the hour rate. Because of something called the Peukert Effect. The Peukert value is directly related to the internal resistance of the battery. The higher the internal resistance, the higher the losses while charging and discharging, especially at higher currents. Conversely, if it is drained slower, the AH capacity is higher.

This is important because some manufacturers and vendors have chosen to rate their batteries at the hour rate - which makes them look a lot better than they really are. A little research indicates the most common standard to be the hour rate. Lieutenant Colonel. FYI - Walmart actually has some of the best batteries you can buy at the best prices.

Their store brand is made by Johnson Controls, who is one of only three battery manufactures in the country. Not sure what that's all about. The computer has the type AGM or wet-cell and also the Ah of the installed battery recorded. Any change on these would require update of these parameters on the computer, supposedly. Don't know how critical it is though. I think the Ah or RC if in the ball park should be fine.

A change from AGM to wet-cell or vice versa maybe more important to require update to the computer. From what I remember charging of AGM and wet-cell is somewhat different.

I expect an AGM battery to be marked, because it would be a selling point. They are considered superior to wet-cells.

There seems to be lots of confusion to determine aftermarket battery battery AH value from RC conversion. Using the equation, it works out to be The registered AH value should never exceed the rated AH value of the battery, otherwise it will overcharge and prematurely damaging and shortening the battery life. If you car is originally coded with 80AH and the replacement battery is AH, you car will only charge the battery to 80AH and pretty soon you will see the battery warning light on the dash even though the battery is still good.

Typically this happens if the registered AH value is smaller than 20AH from the actual battery. Hope this helps. Last edited by hawkoj; at AM.. All times are GMT The time now is PM. User Name. Mark Forums Read. Thread Tools. Napa Battery - What's the AH? Appreciate 0 Tweet. Find More Posts by Zack Find More Posts by tke Quote: Originally Posted by tke Multiply the reserve capacity minutes by 25 then divide by Find More Posts by rlee Find More Posts by Aashenfox.

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Battery Reserve Capacity

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Deep-cycle batteries are rated either by reserve capacity in minutes or by ampere-hour capacity. Battery reserve capacity is a measure of how long a battery.

Glossary of Battery Terms


Almost our every electronic appliance is dependent on these batteries today because everything is converting from traditional wire plug appliances to chargeable ones. This conversion is due to our daily routines that have become more hectic than ever. Unlike every invention, the battery was also a need converted into an invention. From the invention of the very first battery in the s by Volta, this technology has evolved continuously and changed according to the new technological changes. Today from our mobile phone to our car everything needs a battery to operate and now with the invention of electric cars our vehicles soon will be utterly dependent on batteries. Being a green source of energy, it reduces air pollution, which is the main reason everything today is converting its power generation methods to batteries. Also, it provides more energy efficiency compared to other options available. The energy stored inside them can be from different sources, for example. You can charge a battery just by plugging it in a socket and from natural sources like wind or solar.

How to Convert CCA to AH/Amp Hours

reserve capacity to amp hours calculator

Not driving the vehicle for too long or having a parasitic draining element in your car can leave your battery dead. Although you can jump start your car with a jump box and start driving instantly, it is good to charge the battery fully with an external charger to keep the battery healthy. This article includes topics from how you can charge a lead-acid car battery, how long to charge it at 50 amps, 40 amps, 30, 20, 10, and even 6, 4, and 2 amps, and determining factors of charging time, charge time calculation method, and many more! Charging a car battery is easy and almost effortless. Take the battery charger, turn its switch off to be safe from sparks.

For ex amp le, if your pump is drawing mA and you want it to run for 24 hours. Battery Cycle life considerations.

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In a recent article on boats. We need to learn a bit about amp-hour ratings for things like alternators and battery chargers, and about how to size a battery bank to keep all your gear running at its peak performance for as long as you need it to. The minute reserve capacity indicates the number of minutes a battery can deliver 25 amps of current without dropping below An interesting rule of thumb is that typically if you divide a given reserve capacity by two, you will derive the approximate amp hour capacity. A clamp-on meter set to measure amperes will help you determine the electrical demands of your system.

Understanding the specifications

If you have done any research on how batteries work or what you should look for when selecting the best high performance battery , you're probably buried in information, some of which is conflicting. At BatteryStuff, we aim to clear that up a bit. I'm going to attempt to explain how lead acid batteries work and what they need, without burying you with a bunch of needless technical data. I have found that battery data will vary somewhat from manufacturer to manufacturer, so I will do my best to boil that data down. This means I may generalize a bit, while staying true to purpose.

For example, an average automotive battery might have a capacity of about 70 amp-hours, specified at a current of amps. This means that the amount of time.

Calculating Amp Hours For Batteries

DC Battery Specialists is your stocking distributor for wholesale domestic and export batteries. DC Battery Specialists N. Fast Quotes! How are batteries rated and what do the ratings mean in battery selection?

Frequently Asked


Often we get asked how to calculate a how many amp hours the customer needs to run a device or multiple devices. Step 1. Take your time and this will make sense. The following information was copied from PowerStream. So you have an appliance or device like a pump for example and your want to know what size battery you need? Ok, if the current drawn is x amps, the time is T hours then the capacity C in amp-hours is.

If you ask someone what to look for when shopping for a car battery, you'll probably get a lot of different suggestions. Price is an obvious consideration, but other advice may include the looking for the longest warranty, a specific brand, a specific type of battery or the battery with the most cold cranking amps available.

Conversion Tables

When an electrical circuit is created, these materials react with sulphuric acid during charging and discharging according to the following chemical reaction. The unit of measure of the electron flow rate, or current, through a circuit. Chemical formula Sb, atomic number Chemical formula Cd, atomic number The capacity of a battery depends on a number of factors such as: active material weight, density of the active material, adhesion of the active material to the grid, number, design and dimensions of the plates, plate spacing, design of separators, specific gravity and quantity of available electrolyte, grid alloys, final limiting voltage, discharge rate, temperature, internal and external resistance, age, and life history of the battery. CELL The basic electrochemical current-producing unit in a battery, consisting of a set of positive plates, negative plates, electrolyte, separators and casing.

How Long To Charge A Car Battery? Learn to Calculate!

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  1. Shaktisida

    Yes indeed. So it happens. We will examine this question.

  2. Maelisa

    Useful idea