Group 27 deep cycle battery + 2000W inverter
How long can a group 27 deep cycle battery and 2000W inverter power a full-size refrigerator? Assume that the batter is fully charged. Thanks
Forum Discussion
For a rough idea, look at the energy star guide for the fridge and see what it says the energy usage per day is. Many are somewhere around 1 kWh per day, very roughly speaking. (I think they give it per year, but it's easy enough to divide by 365 to get the usage per day.)
1 kWh is equivalent to about 83 Ah at 12V. To the fridge's usage, the conversion inefficiency of the inverter needs to be added. Overnight should generally be doable absent any other significant 12V loads, but probably not much more. Deeply discharging a lead-acid battery is pretty rough on it and doesn't lead to its having a long lifespan. Leaving it discharged is doubly harsh.
1 kWh is equivalent to about 83 Ah at 12V. To the fridge's usage, the conversion inefficiency of the inverter needs to be added. Overnight should generally be doable absent any other significant 12V loads, but probably not much more. Deeply discharging a lead-acid battery is pretty rough on it and doesn't lead to its having a long lifespan. Leaving it discharged is doubly harsh.
