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Old 12-20-2013, 06:07 AM   #8
Bay Pelican
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City: Chicago, IL
Country: USA
Vessel Name: Bay Pelican
Vessel Model: Krogen 42
Join Date: Oct 2007
Posts: 2,808
[QUOTE=av8r;200042]You will lose efficiency at some undefined level when you take shore-power 120 VAC, turn it into 12VDC with a charger, then turn that back into 120 VAC with the inverter so it would be more efficient to power the refrig from shore power. That efficiency loss may or may not be a practical consideration depending on your total shore-power use and your rates.

I am sure you can calculate the efficiency loss and what the added cost will be, but given the low cost of the transfer switch the recommendation is a good one. The transfer switch will also provide flexibility in the event the inverter fails as you can then go on shore or generator power at the flip of a switch.

As to the size of the charger, it is unfortunate you have a cheapo inverter. The marine inverter / charger for 1500 watts would usually provide a 100 amp charger which would cut your generator time by 66% and would also allow for a pass through of shore power or generator power when connected. The pass through of the generator power would reduce your generator run time because it would eliminate the draw on the batteries when the generator is running.

Marty
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