Lithium-ion batteries typically have an energy density of 150 to 250 watt-hours per kilogram, while lithium iron phosphate (LiFePO4) batteries are around 90-160 watt-hours per kilogram. How to check lithium battery capacity? Capacity can be tested using a multimeter or a battery analyzer that measures the discharge rate over time.
Lithium battery capacity is typically measured in ampere-hours (Ah) or watt-hours (Wh), indicating the amount of charge it can hold. Common capacities vary based on application but range from small batteries at a few Ah to large storage batteries of several hundred Ah. What is the usable capacity of a lithium battery?
Typical voltages vary by battery type, e.g., lithium-ion (3.6V or 3.7V per cell) and LiFePO4 (3.2V per cell). Energy per unit weight or volume, reflecting the battery's storage efficiency. Lithium-ion has high energy density compared to other chemistries, allowing more energy in a smaller, lighter package.
If you want enough power for 3 days, you'd need 30 x 3 = 90 kWh. As discussed in the post above, the power in batteries are rated at a standard temperature, the colder it is the less power they have. So, with batteries expected to be at 40 to supply 10 kWh, with this data you'd multiply by 1.3 to see you would need 13 kWh of batteries.
Let's say you look at your monthly power bill and it says you consume on average 892 kWh in 31 days. So, 892/31/24 = 1.2 kWh/hr Discharging from a battery has inefficiencies, lead around .88 and lithium .96 to .98. So, if you're using Lithium it's 1.2/.96=1.25 kW/hr With that number we can see the power consumed per day is 24 x 1.25 = 30 kWh.
A 100Ah lithium battery has 100 ampere-hours of capacity, which translates to 1,200 watt-hours at 12 volts (or 1.2 kWh). What is the standard lithium-ion battery capacity? For consumer electronics, common capacities are around 2,000 to 4,000mAh.