Are portable generators safe? - Page 4 - SailNet Community
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post #31 of Old 02-11-2013
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Re: Are portable generators safe?

Yeah Doug, that's a tad out of the range of a portable generator

I don't have a daily draw on my Irwin yet (too new to me). On my Gemini we managed to just barely fall short with a single 80w and 210ah of AGM's, making 35-40 and using 45-50 a day.
My goal was three days of hang time, then motoring out of the anchorage, into the next caught me up to 100%. It worked.

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post #32 of Old 02-11-2013
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Re: Are portable generators safe?

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Originally Posted by chucklesR View Post
Yeah Doug, that's a tad out of the range of a portable generator

I don't have a daily draw on my Irwin yet (too new to me). On my Gemini we managed to just barely fall short with a single 80w and 210ah of AGM's, making 35-40 and using 45-50 a day.
My goal was three days of hang time, then motoring out of the anchorage, into the next caught me up to 100%. It worked.
Well, on that boat, I also had a 2000 watt Honda. Which was good to charge the Perkins engine battery if all else failed.
We also had a high output alternator - 165 amps, (I think), besides the regular 90 amp engine battery alternator.

But, until I added the second battery bank, (I raised the floor of the crews quarters cabin ) we were dying in the 3rd day.

After that second bank, we were never running low.... well, when we were, I just switched the banks!
I loved that!
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post #33 of Old 02-11-2013
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Re: Are portable generators safe?

I'd suggest you seriously study up on the chart MS posted and consider it while you are building out your next boat.
I hear ya on the simultaneous charge and drain, but the P effect is real.
The Honda on the Irwin is for running the cruisair, topping off the windlass battery (normally echo charged), emergency charging and (like I said) anything over 1kw that I need to run short term.

I suspect most cruisers are in the same range I'm in, 500-800ah on a single bank, maybe with a starter and windlass battery separate.

I can see a watermaker in my future, but it will be a 8 amp 6 gallon a hour type - and I'll run it at the top of the day when I have 'excess' power to bleed from my solar.

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post #34 of Old 02-11-2013
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Re: Are portable generators safe?

Quote:
Originally Posted by DougSabbag View Post
We had, (and have again), a fully electric boat.

B&G auto helm (used 12 amps whenever she flexed her muscle)
FrigoBoat refrig
FrigoBoat freezer
Marine Labs Water Maker (SERIOUS POWER DRAINER)
Splendide Washer / dryer powered through a 5000 watt inverter
Numerous pumps
Hot water tank
computers
(2) 18,000 BTU A/C systems
radar
lights
(2) TVs
etc.....
Doug,

You are a prime candidate for LiFePO4 batteries.. Head over to Cambridge and investigate Genasun...

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post #35 of Old 02-12-2013 Thread Starter
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Re: Are portable generators safe?

The Blue Sky MPPT website says that you need a minimum of 3.5 amps of panel output per 100 AH of battery capacity to avoid sulfation. The Noco Genius Chargers minimum output for recharging a 100 ah battery is essentially the same. So it seems to be a reasonable number. Given that then you can easily figure out what size battery bank your panels can support. More output would shorten your charging time but at least you have a floor on panel size re your battery bank size. Thanks. Steve S.
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post #36 of Old 02-12-2013
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Re: Are portable generators safe?

Quote:
Originally Posted by DougSabbag View Post
We had, (and have again), a fully electric boat.

B&G auto helm (used 12 amps whenever she flexed her muscle)
FrigoBoat refrig
FrigoBoat freezer
Marine Labs Water Maker (SERIOUS POWER DRAINER)
Splendide Washer / dryer powered through a 5000 watt inverter
Numerous pumps
Hot water tank
computers
(2) 18,000 BTU A/C systems
radar
lights
(2) TVs
etc.....
Geez I thought I had the comforts of home aboard - by this standard my boat is bordering on primitive. Although I also have fridge, freezer, watermaker, and all the other fundamentals on the boat but I get away with 6 T105's in the main bank and just one start battery with a separate windlass battery. My daily consumption living on the hook is about 220Ah per 24 hours

I charge with 280w of solar array, a small windgen and a 180A big frame alt and the standard 90A alt on the donk.

But 2400Ah capacity? Wow. I'd have to lift my waterline.

Surely the new boat (if I understand correctly you're busy kitting out a new boat?) will have more electrically efficient gear on board. Watermakers and autopilots of today use just a fraction of the gear described above.


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post #37 of Old 02-17-2013 Thread Starter
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Re: Are portable generators safe?

An interesting article about gen sets and AGM's can be found on the Electric Boats site in Yahoo Groups (message #23054) where the owner of a Hylas 44 went with the genset - AGM combination. I gave the message number because the link may not work on Sailnet but it works on Electric Boats. Thanks. Steve S.

http://www.c-e-marineamericas.com/re...%20to%20Elect\
ric%20Propulsion.pdf

Last edited by sstuller; 02-20-2013 at 05:20 AM. Reason: link correction
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