Residential Fridge - battery power
We just replaced the Norcold with a residential refrigerator. The question is - if I turn on the inverter will it run the refrigerator without harming the batteries?
Forum Discussion
I got curious so looked up the pertinent stuff.
Your fridge uses 1.1-1.6 amps at 115V. The spread in current is probably due to the icemaker and the defrost mode cycling. Assuming no icemaker running and defrost cycle shut down (best scenario), running current draw would be around 1.2 amp, depending on ambient temp. At 80f, the nfg. states a duty cycle of approx. 50%. The above translates to a daily draw of 14.4 AH at 115v. Taking into consideration the loss through the inverter and transfer to 12v, your daily draw would be 144 AH.
Your Energizer Marine batteries may have a 20H capacity of 90 AH. There are no rock-hard figures for this because it is a hybrid deep cycle/starting battery and cranking amps don't correlate directly to AH capacity. Assume it's close to 90AH capacity per battery, X3= 270 AH capacity.
The numbers say that you should be able to run the fridge for one day until reaching approx 50% of the state of charge of the battery bank, industry standard for sustaining durability of the batteries. This would be with NO other loads present. Plug in a crock pot and all of the numbers go away. Run those Energizers down to alarm trip on the inverter more than twice and you will be buying new batteries.
Your fridge uses 1.1-1.6 amps at 115V. The spread in current is probably due to the icemaker and the defrost mode cycling. Assuming no icemaker running and defrost cycle shut down (best scenario), running current draw would be around 1.2 amp, depending on ambient temp. At 80f, the nfg. states a duty cycle of approx. 50%. The above translates to a daily draw of 14.4 AH at 115v. Taking into consideration the loss through the inverter and transfer to 12v, your daily draw would be 144 AH.
Your Energizer Marine batteries may have a 20H capacity of 90 AH. There are no rock-hard figures for this because it is a hybrid deep cycle/starting battery and cranking amps don't correlate directly to AH capacity. Assume it's close to 90AH capacity per battery, X3= 270 AH capacity.
The numbers say that you should be able to run the fridge for one day until reaching approx 50% of the state of charge of the battery bank, industry standard for sustaining durability of the batteries. This would be with NO other loads present. Plug in a crock pot and all of the numbers go away. Run those Energizers down to alarm trip on the inverter more than twice and you will be buying new batteries.
