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Old 10-01-2019, 11:10 AM   #81
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City: Seattle
Country: USA
Vessel Name: Paradigm Shift
Vessel Model: Bayliner 3587
Join Date: Sep 2019
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Originally Posted by rslifkin View Post
How much power does your diesel furnace draw? My house bank is only 400ah (2x L16) and if I added some solar, it would be plenty big enough. Between just fridge and other small loads, I typically draw around 40 ah overnight. Daytime consumption is a bit higher (fridge works harder with higher temps, usually have the stereo on, etc.). So figure anywhere from 100 - 150 ah in a 24 hour period.

Do you have similar draw numbers for your current boat? And maybe a sense of how similar your draws will be on the new boat?

In my case, I end up running the generator 1 - 2 hours per day while away from shore power whether the batteries need charging or not. My galley is all electric, so the generator gets run in the morning to make coffee and use the stove or microwave. And often in the evening for galley power as well. Plus, one of those runs usually serves to warm up the hot water tank for showers. So that generator runtime (most of which can't be replaced with an inverter) plus probably 600-ish watts of solar (which I don't currently have) would make me power independent basically indefinitely even if my loads grow a bit.
the furnace draws about 6A when it's running. We tend to spend more time on the dock plugged in when it's cold anyway, so it hasn't been a major contributor to draw. I did a full spreadsheet for draw based on real numbers puled from my battery monitor on the current boat. We also have hundreds of hours aboard, so we have solid intuitions about power use.

For the new boat, we're using estimates and assumptions. The fridge is a small domestic model, which runs on AC only, so the inverter will be on all the time. There are a number of items that will be more power intensive. But, with a quieter generator (running our current generator is a bit loud) and the solar panels, I suspect our usage patterns will be different.

From the input on this thread, it sounds like 300 Ah useable should be fine if we plan to run the generator or cruise somewhere every day. If we wind up falling a bit short, we can always add another 200Ah battery.
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Old 10-01-2019, 07:13 PM   #82
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City: Gig Harbor
Country: United States
Vessel Name: Kinship
Vessel Model: North Pacific 43
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Originally Posted by Shifty View Post
the furnace draws about 6A when it's running. We tend to spend more time on the dock plugged in when it's cold anyway, so it hasn't been a major contributor to draw. I did a full spreadsheet for draw based on real numbers puled from my battery monitor on the current boat. We also have hundreds of hours aboard, so we have solid intuitions about power use.

For the new boat, we're using estimates and assumptions. The fridge is a small domestic model, which runs on AC only, so the inverter will be on all the time. There are a number of items that will be more power intensive. But, with a quieter generator (running our current generator is a bit loud) and the solar panels, I suspect our usage patterns will be different.

From the input on this thread, it sounds like 300 Ah useable should be fine if we plan to run the generator or cruise somewhere every day. If we wind up falling a bit short, we can always add another 200Ah battery.

If you are concerned about it, you can always ask Trevor about adding another battery. Likely it would be cheaper and easier to have them do it at the factory than waiting until after delivery.

Another thing I have thought of repeatedly is the possibility of combining the house and thruster banks. Iím not sure how the NP45 is configured, but that would give you an 800Ah bank to use for both. It might be worth considering and asking Trevor and a qualified marine electrician.
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