Reserve capacity minutes to amp hours calculator

P V I. Multiply the reserve capacity by 60 to convert it to seconds.

No variables or coefficient.

Reserve capacity minutes to amp hours calculator. How to Convert Reserve Capacity to Amp Hours. The reserve capacity of a battery is the number of minutes for which it can run at 25 amps of current without its voltage dropping below 105 volts. It roughly describes the amount of energy the battery effectively stores and technically specifies the batterys charge.

Reserve capacity minutes RCM also referred to as reserve capacity RC is a batterys ability to sustain a minimum stated electrical load. It is defined as the time in minutes that a lead-acid battery at 80 F 27 C will continuously deliver 25 amperes before its voltage drops below 105 volts. Battery capacity formula.

As you might remember from our article on Ohms law the power P of an electrical device is equal to voltage V multiplied by current I. P V I. As energy E is power P multiplied by time T all we have to do to find the energy stored in a battery is to multiply both sides of the equation by time.

E V I T. Hopefully you remember that amp hours. It identifies how many minutes the battery can deliver a constant current of 25 amps at 80F without falling below the minimum voltage 175 volts per cell needed to keep your vehicle running.

Amp Hour and C20 Battery Capacity. Amp Hour or C20 is an indicator of how much energy is stored in a battery. 1 coulomb is equal to 0016666666666667 amp min or 000027777777777778 ampere-hour.

Note that rounding errors may occur so always check the results. Use this page to learn how to convert between ampere-minutes and ampere-hours. AmpHours Reserve Capacity 2 plus 16.

16 formula is a rough approximation of Peukerts Law that can easily be done without a calculator. It is reasonably accurate only in the range of 100-180 min reserve capacity essentially the automotive range. Conversion from RC reserve capacity to Ah 20 h minute Ah 10 8 15 11 20 15 25 18 30 22 35 25 40 28 45 31 50 35 55 38 60 41 65 44 70 47 75 49 80 52 85 55 90 58 95 61 100 63 110 68 120 74 130 78 140 83 150 88 160 93 170 97 180 102 190 106 200 110 210 115 220 119 230 123 240 127 250 131 260 135 270 139 280 143 290 146 300 150 310 154 320 157.

Recalling that we divide watts by volts to get amps supplying a 300-watt inverter load from a 12-volt battery requires 25 amps. So a battery with a reserve capacity of 120 minutes can theoretically handle this load for two hours but the practical limit is just one hour since it is never a good idea to discharge a battery more than 50. It will become 1500003600 4167.

This is the amp-hours or the reserve capacity of a battery. So Reserve Capacity Minutes RCM or just reserve capacity is the ability of a battery to sustain the fully charged state at 80-degree Fahrenheit or 27-degree centigrade delivering 25 amperes continuously before dropping below 105 volts. My point in posting this was to prevent folks from confusing Ahs at the 20 hour rate and reserve capacity ratings as I have seen done many times.

Take the DEKA WM DeepCycle 105. It has 105 AMP HOURS at the 20 hour rate of 525 amps 80f to 105 volts and 185 MINUTES at the RC load of 25 amps at 80f to 105 volts. Reserve Capacity RC is a very important battery rating.

This is the number of minutes a fully charged battery at 80F will discharge 25 amps until the battery drops below 105 volts. An amp hour AH is a rating usually found on deep cycle batteries. Ok if the current drawn is x amps the time is T hours then the capacity C in amp-hours is.

For example if your pump is drawing 120 mA and you want it to run for 24 hours. C amp hours 012 Amps 24 hours 288 amp hours keep going not done calculating yet Step 2. Battery Cycle life considerations.

Reserve Capacity is usually the number of minutes a battery can deliver at a 25-amp rate so multiply the number of minutes by 25A and divide by 60 and you have a measure of Ah 25AAmp Hours is usually the number of Ah a battery can deliver at the 20-hour rate. The reserve capacity of a battery is the number of minutes for which it can run at 25 amps of current without its voltage dropping below 105 volts. Ampere-hours is a different unit for describing the same quantity.

Multiply the reserve capacity by 60 to convert it to seconds. Battery Run Time Formula. The following equation is used to calculate the total run time of a battery.

T 10 a w. Where T is the time in hours. A is the amp hours battery capacity w is the power outputusage.

A reserve capacity rating tells you the reserve capacity of a battery. The higher it is the longer it can sustain voltage. An example measure for reserve capacity would be RC 25A 160 minutes.

This means that at 25 degrees Celcius the battery can supply 25 amps for 160 minutes before the voltage drops. I have this app application and I need it to run for X hours what size battery will I need. This calculator will tell you what battery size you need.

This calculator will tell you what battery size you need. The 140-minute reserve capacity indicates the number of minutes a battery can deliver 25 amps of current without dropping below 105 volts. 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.

The most common battery rating is the CCA or cold cranking. Using the equation at the top of the page we know that a 100 AH rated discharged at 25 amps should last 4 hours or 240 minutes. Thus its reserve capacity is 240 minutes.

However since 25 amps is quite a bit higher than the 20-hour rating of 5 amps we know that well actually get less than 4 hours. Reserve capacity is the simplest. You take a given battery at 80F and discharge it at 25 amps and count the number of minutes until it reaches 105 volts.

No variables or coefficient. It takes one test to determine the results. Amp-hours is more complicated.

The measurement is a combination of time and current. This page is a quick run-time calculator to help you estimate the run-time based on simple assumptions. Note that there are battery run-time calculators on the web that are very wrong.

Enter your capacity Amp-Hours and your discharge in Amps in the form below and press the Compute button. Ask how the companies come up with the reserve capacity in minutes. Then ask how the amp-hours at the 20 hour rate are measured.

Both are done on a fixed rate of demand. Neither one have much to do with real life use of a battery bank. They are only useful for comparing the size of the battery.

Battery Capacity Hours x Amp Run Time. Battery Capacity in mAH milli Ampere hours Battery life in Hours. Load Current Consumption of device in Amperes.

07 Battery Cycle life considerations Run Time Note. In an ideal case the battery capacity formula would be.