The average energy consumption of a refrigerator is 350 kilowatt-hours/year. Other questions asked about 100Ah batteries: How long will a fridge run on a 100AH battery?Ī 100Ah 12 volt deep-cycle lead-acid battery can run a 400W rated AC fridge for 15 hours at a rate of 40 watts per hour. A 200Ah 12 volt deep-cycle lead-acid battery will power a 400W AC fridge for 30 hours, drawing power at a rate of 40 watts per hour. Swipe for More Renogy Batteries Innovation Meets Quality – Shop Now! How long will a 200ah battery run an appliance that requires 400W?Ī 200Ah 12 volt lead-acid deep-cycle battery will run a 400W DC load for 3 hours at 50% Depth of Discharge. Table – 12V Lead Acid Battery Capacity Vs Terminal Volts How do you know how much capacity is left in your 100Ah battery? There is a rough relationship between lead-acid terminal voltage, at least, good enough for an estimate of how much power you have left. Once discharge approaches 40% to 50% the compressor surge current may pull the voltage down too much and trigger the inverter low-volts alarm.īecause of the above, I would revise the comfortable running time down to 10 hours. Running time in hours for 400W fridge fed from 100Ah battery = 600Wh / 40W = 15 hoursĪ word of warning: Look at the chart below and you’ll see that the battery volts goes down as it discharges. I’ll ignore the inverter losses to keep it simple: How long will a deep cycle battery run a fridge? Really, we only have 50Ah available, or 600Wh. Check the latest RENOGY Pricesįor an appliance such as a 400W refrigerator, we can equate the hourly watts used to battery capacity by converting amp-hours (Ah) into watt-hours (Wh):īattery watt-hours = amp-hours x voltage How many kWh in 100Ah battery?įor a 100Ah battery we have 1200Wh, but remember we can only discharge a deep-cycle battery 50%. Based in the US, where the products are manufactured, they are widely known and respected for innovation and quality. RENOGY are fast becoming the preferred source for solar panels, kits, batteries and solar control accessories. How does this relate to battery amp-hours? Let’s go with the average of 40 watts per hour. So now we know that our 100Ah battery has to deliver 40 watts every hour on average, but the energy used isn’t the same day and night – more energy is used in day-time when the door is opened regularly.
Hourly fridge power consumption = 958 / 24 = 40 watts.Daily fridge energy consumption = 350kWh / 365 = 958 watt/hrs.
The first step if to work out how much energy it takes per hour: Let’s say the average amount is 350kWh/yr.
Each fridge label carries an estimate of the energy it will consume on average over the year in kilowatt-hours (kWh). The best way to assess the energy consumption of a fridge is to use the manufacturer’s data. In these cases, another method of calculating battery drain is needed. To make things worse, for some appliances, like fridges, freezers and air conditioning, the relationship between voltage and current isn’t constant. The battery DC voltage needs converting to AC and stepping up to either 120 volts or 220 volts, depending on location. Hours left in battery = battery capacity in Ah / current draw in amps
In this case how long a battery will last in hours can be found by a simple formula: This is really convenient when you have a DC load and you know what the current draw is in amps. How do you calculate how long a battery will last?Īll batteries have a rated capacity in ampere-hours (Ah). Video – Factors affecting 100Ah battery run-time A 100Ah 12 volt deep-cycle lead-acid battery can run a 400W rated AC fridge for 15 hours at a rate of 40 watts per hour. Let’s assume for this post that the 100Ah battery is 12 volt lead-acid deep-cycle type ( this one).Īn answer to the question would need to contain details of what kind of appliance load we are talking about, if it’s going to have any meaning and be useful.Ī 100Ah 12 volt deep-cycle lead-acid battery can run a 400W continuous DC load for 1.5 hours with the recommended 50% Depth of Discharge. What if it’s for an RV or boat? Then the 400W would be a direct DC load and could be 12, 24 or even 48 volt. In this case an inverter is required, which also takes a little power. The word ‘appliance’ indicates something we would use in the home, so it would be AC and 120 volts (US) or 220 volts (EU). When I first saw this question my first reaction was to create a 100 Ah battery discharge calculator for appliances that require 100W to 1000W, but there’s a problem.
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