Join Date: Jan 2003
Location: Maine Coast
Thanked 229 Times in 176 Posts
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Re: Inverter for hot water tank
As Bill stated above unless you have an alt that can support the load or 85-90% of it you will be running a big deficit on your bank even with the engine running.
Even if we figure you have the 60A Yanmar alt, likely not, and we also "assume" it could actually run at 60A, which it won't, you are still losing 90A.
Bill likes to use 1.1 as an efficiency factor for a heater element/inverter and with some inverters this is true but I fudge on the side of caution and use a 1.2 efficiency multiplier...
1500W / 12V = 125A X 1.2 Eff Loss = 150A load - 60A Alt = 90A draw even with the engine running.. (this is a best case scenario)
In all likelihood a 60A Hitachi will be putting out under 30A when driven hard due to its internal regulator temp compensating and reducing the voltage to cool itself....
-Maine Sail / CS-36T
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