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1200W from 12v is 100Amps without the inverter losses. Leisure batteries should not be discharge below about 50% So you'd need 200Amp hour of battery just to keep the calorifer running for 1 hour. Probably more like 3 or 4 hundreds Amp hours for reliablity.. That's several batteries required. Really I think unless you are prepared for the battery and connection costs, then it's mains hook up only..
Oh and as for inverter I'd probably go for 3 KW, because many are optimistically rated, and running one continuously near the limit, is likly to reduce it's life..
This message was edited by Sheque1 on Sep-10-19 @ 11:13 AM
Hi Jim If you only use it for heating a element then the Quasi /cheaper one will do. I wouldn't recommend heating the water from batteries but if only used when running engine it would be ok but water is normally heated from the engine via a coil in the tank/califoria with the immersion heater used only on shore power therefore no need for a inverta unless you have a micro oven or teli in which case a Pure Sine Wave one is preferable. John
Hi Jim If you/do you? have mains on your mooring you can use the immersion heater and heat the water and in winter you my find that it can flow around engine and preheat your engine making starting better. John
quote:"...... If you/do you? have mains on your mooring you can use the immersion heater and heat the water and in winter you my find that it can flow around engine and preheat your engine making starting better. ......."
how does this work? does the water naturally flow around the engine cooling loop due to the hot water rising and the cold sinking or is a small pump required?