Battery Ah Rating Calculator

C rate is used to describe how fast a battery charges and discharges.

Battery ah rating calculator. The rule of thumb for converting cca to ah is dividing it by a 7 25 constant. Now go back to steps 2 4 above to refine your calculation. The amp hour also has sub units like the milliampere hour. A 2c charge loads a battery that is rated at say 1000 ah at 2000 a so it takes theoretically 30 minutes to charge the battery at the rating capacity of 1000 ah.

Connect a basic resistor across the battery s terminals then monitor the discharge over time until the voltage decreases to 12 volts. The battery rating of a lead acid batteries is proportional to the discharge rate. This is the current i used for either charging or discharging your. However when the 2 105 20 hrs batteries in parallel are used and then put on charge after use the batteries typically register 50 charged.

C rate of the battery. They are typically rated for a discharge rate over 20 hours. Last example a lead acid battery with a c10 or c 10 rated capacity of 3000 ah should be charge or discharge in 10 hours with a. If you are using a different voltage battery the amp hours will change by dividing it by the battery voltage you are using.

You can then use a measurement of the battery s current to calculate the ah rating. A 2c battery would need just half an hour to load 100 ah while a 0 5c battery requires two hours. Suite h el cajon ca. For instance if your battery is marked with a 1450 cca it represents 200 ah.

This 740 cca or 102 ah battery will run 12 75 hours when running at 8 amps of voltage or 10 2 hours at 10 amps of voltage. A lithium ion battery showing watt hour wh rating on the case. If not you can calculate it as volts x amp hours ah. An amp hour ah is the amount of current a certain battery can supply for a certain period of time.

Ah value indicates how long the battery will run. Mon fri 9am to 5 00pm. For example a 1c battery needs one hour at 100 a to load 100 ah. Address 1985 friendship dr.

The higher the cca rating the more the amp value of a battery. A battery of this rating should last for 25 hours while producing power of 8 amps. To determine the ah rating of a 12 volt battery use a multi meter. Using the inverter calculator indicates 14 35 amps dc load and then running the sizing calculator suggests that i need battery capacity of 306 ah 20 hrs.

This is usually stated on the battery itself see image 1. An 11 1 volt 4 400 mah battery first divide the mah rating by 1 000 to get the ah rating 4 400 1 000 4 4ah. For example a 20 ah battery can deliver 1 a for 20 hours which amounts to 20 ah. Call or text us.