Knowledge Base : Tools : Calculator | DC to AC amperage conversion run through an Inverter So, you’ve got an electrical appliance to run, but no place to plug it in. When you need to run a regular household electrical type device in an area where no regular grid power is available, this calculator will help you figure out what size batteries and inverter you need! Welcome to our DC/AC conversion tool (with inverter). This calculator is designed to assist you with power usage amounts, when converting from one power form to another using a DC to AC inverter. Just enter power numbers in the fields below, and we will do the calculations for you, including typical inefficiencies and all that other techie type stuff you may not care to calculate. If you are not sure of your numbers, have a look at the walkthrough illustrations below when entering numbers. Enter AC Device Ratings Amps AC (enter mAh as .xyz) 12 V     24 V     36 V     48 V Many applications will have a range of Input AC voltage.

In the US, it can be anywhere from 100-125 VAC. In Europe, it's usually 200-240. For this example, we'll use the US standard of 120 Volts AC. Input Amperage is how much current the application draws from the AC power. This number is usually rated in Amps. If the current is rated in milliamps (mAh) you can convert it to Amps by diving the number by 1000. For instance, our example application draws 300 milliamps, which is the same as 0.3 Amps. Wattage is the total amount of power the application uses. It's calculated by multiplying voltage by amperage. Therefore the 120 VAC x 0.3 Amps equals 36 Watts. Output Voltage is rating of your battery system, usually a single 12 volt battery. We use 12.5 volts for 12 volt battery systems. Now we know that our application uses 36 watts of total power. If you take this power from a 12.5 VDC source, then the total amperage required increases to 3.31 Amps, or 3,310 milliamps. Since batteries have a limited capacity, or amp hours, it's important to size a battery large enough to handle the amperage demand for your application.

Share what you learned with your friends Was this information helpful? 38 Responses,   4.9 Rating BatteriesBattery ChargersPower InvertersSolar ChargersBattery RestorationBattery AccessoriesCables and ConnectorsFuel TreatmentsMADE in USAEmergencyPower SuppliesAll Products by Brandhow much electricity does my ac unit use charging laptop with a diffrent manufacture chargernew ac unit costs How can I tell if an AC adapter is compatible with my laptop? central ac unit removalFor example, does the voltage output have to bee the same, or just close? What power measurements matter? marked as duplicate by ChrisF, BinaryMisfit This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Any AC adapter is considered compatible with any device if it has all the following traits: The voltage of the adapter has to be identical. It's possible that a voltage can be "close enough" because many devices are built to work within a certain voltage range. But there's no way to know reliably how your device will handle a different voltage. The amperage (amps) of the adapter has to be equal or greater than the device. A device draws amperage from an adapter so there has to be at least as much amperage available as the device needs. The polarity of the adapter has to be identical. The polarity of your adapter (and device) is usually indicated by a diagram with two circles showing a plus (+) and a minus (-) pointing to the outer plug and the inner plug. Of course, the shape of the plug in your device has to match the shape of your adapter so you can plug it in. If you can match all four criteria, you should be okay. This has been covered before, but you need to ensure:

the voltage is the same the polarity of the tip (of the laptop plug) is the same the size and shape of the tip is the same (shape isn't usually an issue as they all tend to be round, but the size might be different). the current is greater than or equal to the requirements of the laptopBrowse other questions tagged power-supply .The size of your Lennox Air Conditioner can be determined from the model number of the unit.  The model number (M/N) can be located outside on the panel along with the serial number. A unit with a model number of 10ACB42-1P lists the unit's capacity that it provides to the living space. 42/12 = 3.5 Tons of cooling. A unit with a model number of HS10-261-1P lists the unit's capacity that it is capable of producing. 26,000 BTUs: 26/12 = 2.17 Tons in which .17 tons or 2000 BTUs are needed to overcome motor heat and other factors and 2 tons or 24,000 BTUs are available for the living space. There are 12,000 BTUs (British Thermal Units) per ton of AC cooling.