Cruising Sailors Forum Archive

Each burner on the 1500 watt cooktop is likely 750 watts...

750 watts is an approximately 60 amp draw from your batteries assuming your batteries are fully charged and the inverter is 100% efficient. Most inverters are actually about 90% eficient so the 750 watt burner will draw about 67 amps from the battery. A typical GRP 31 battery has an amp-hour capacity of about 115-120. Assuming a 120 amp-hr capacity and only drawing the battery down by 50%, you could run the 750 watt burner element on high for about 55 minutes. At half power, you could run for about two hours. Of course, amp-hour ratings are done for a 20 hour discharge, which means a 6 amp draw for a 120 amp-hour battery. If you draw more than that the available amp-hours from the battery drops significantly. I would expect that you could run that 750 watt burner on high for no more than 30 minutes or at half for about a bit more than an hour before your battery would need recharging.

If you really want to use an electric cooktop, then you need to buy a generator or have several hundred amp-hours of battery capacity

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