The number of watts a deep cell battery can supply depends on its voltage and amp-hour (Ah) rating. It's more accurate to talk about watt-hours (Wh) since watts represent instantaneous power, while watt-hours represent the total energy the battery can deliver over time.
A battery's watt-hour capacity is calculated by multiplying its voltage by its amp-hour capacity.
For example, according to our reference: A 12-volt, 105 Ah deep cell battery can supply 12 volts * 105 Ah = 1260 watt-hours (1.26 kWh) under ideal conditions and discharged to 100%.
Therefore, a single answer for how many watts a deep cell battery "is" is not possible. Instead, you determine the watt-hour capacity based on voltage and amp-hours.
