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Old 06-15-2015, 10:30 PM   #41
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my gen has a magnum energy ags wired directly into the me2000 inverters. It monitors batt. Voltage and is set to come on at 12.4 volts. It also monitors interior temp and starts the gen at a preset temperature. The ac is set to come on at a slightly higher temp. It has a few other bells and whistles that i dont use.
very nice!!!!!
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Old 06-15-2015, 11:15 PM   #42
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oh my!
so much to learn....I hope the lessons are relatively inexpensive.
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Old 06-16-2015, 01:48 AM   #43
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Actually my math is accurate. Terminology is of course open to interpretation.
...
Kevin,

BobH was actually quoting FF (post #19) and not you. It was his math and terminology that was off and not yours. It was a bit confusing since he didn't actually attribute the quote.

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Old 06-16-2015, 06:28 AM   #44
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Show us your genny(s) !
Back to the dual genny thing.
We have two Onans,originally a 25kv and 12kv.
The small one was replaced at about 12000 hours with a 17 kv Onan.
The 24kv unit currently has about 6600 hours on it.
We usually only run the larger genny to cover high AC loads (8 units !) it's great peace of mind knowing you have a backup.Nothing wrecks the day like no power.

I love my new genny (don't tell my wife please,she already wonders why I spend so much time on board.)It so quiet that even though it's under the galley floor you can hardly tell it's running,I keep forgetting to turn it off.
We are a galley down boat, so the engine room is aft of the galley ,on the same level.The 25kv unit us under the cover below the electrical panel.
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Old 06-16-2015, 06:33 AM   #45
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"Lets do some math regarding that. 1500 watts is 125 amps at 12v. 125/3=41 amp hours average on your battery bank."

Using a 1/3 duty cycle the discharge would be perhaps 1/3 of 9 hours or 3 hours. (ez math)

3 hours at 125A is 450 AH , so a 1000AH bank would be down at least 50%

Remember the very high discharge rate , flattens the bank faster than the 20 hour rate..

So at least 500ah would need to be returned , plus about 15% to "push it in".

How goes a typical noisemaker put almost 600AH in a battery bank during the day?

1/10 of 1000AH bank size (C-10 charge rate) would require 100 amps for at least 6 or 7 hours .

Fine if the AC is required all the time there is sunshine .
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Old 06-16-2015, 06:48 AM   #46
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A few weeks ago I was anchored out and left my water heater (1200W) turned on while I was on my inverter. I had used up about 300Ah of battery by the next morning!

Richard
Electric panel can easily be wired so that the chargers/water heater and AC cannot be operated off of the inverter. In my case with AC/DC refrigeration I have also wired the panel so the refrigeration is not run off the inverter.

Basically the inverter feeds a breaker on the panel and the desired AC appliances are fed from that breaker - using their own breakers of course.
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Old 06-16-2015, 09:23 AM   #47
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Electric panel can easily be wired so that the chargers/water heater and AC cannot be operated off of the inverter. In my case with AC/DC refrigeration I have also wired the panel so the refrigeration is not run off the inverter.

Basically the inverter feeds a breaker on the panel and the desired AC appliances are fed from that breaker - using their own breakers of course.
Yes - there are some AC loads on the boat that aren't energized by the inverter. I found it amusing that the water heater was one of the loads that is.
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Old 06-16-2015, 10:27 AM   #48
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I put in a separate breaker panel for just inverter loads. Powers the galley outlets, head outlets (hair driers), TV/entertainment outlets and outlet on the flybridge for keeping the tablet charged.


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Old 06-16-2015, 10:31 AM   #49
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I put in a separate breaker panel for just inverter loads. Powers the galley outlets, head outlets (hair driers), TV/entertainment outlets and outlet on the flybridge for keeping the tablet charged.


Bob
...bought new electrical panels this year...specified one separate 6 breaker panel just for outlets...which is all I really need or want on the inverter load....

easy to deal with...eventually if I decide to add an appliance or two..I can always add them in a circuit or double up outlets and replug-in....
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Old 06-16-2015, 11:20 AM   #50
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That's how our boat is also setup, a 120V non inverter service and a 120V Inverter service panel. Along with the 240V Ships panel, and 240V HVAC panel. Only thing not on the inverter is the water maker. But it doesn't matter as the inverter is a pas through when the gennys on or on shore power.
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Old 06-16-2015, 12:26 PM   #51
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"

How goes a typical noisemaker put almost 600AH in a battery bank during the day?

1/10 of 1000AH bank size (C-10 charge rate) would require 100 amps for at least 6 or 7 hours .

Fine if the AC is required all the time there is sunshine .

If you are going to run the main have a high amp alt putting out 75a for say 6.5 hours running (or twins with same putting out 40 or so amps each)

Most 3000watt inverters have 100amp chargers built in and already have large cables to provide the current with ease, an 8Kw gen-set should handle that with ease and still provide power for running limited system power (AC but not stove and hot water as an example).

Battery size would dictate battery heating and that would limit charge rate, I would want large Rolls L-16 deep cycles as found on electric fork lifts for a bank in this situation.

You are correct regarding the effect of high/fast rate or discharge being greater then a lower/longer depleting the battery at a greater rate then the math would suggest this is called the Peukert effect.

The scenario suggested would not be very satisfactory in the long term I would suspect.
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Old 06-21-2015, 09:56 AM   #52
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How are two gen sets electrically isolated?
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Old 06-21-2015, 10:16 AM   #53
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How are two gen sets electrically isolated?
On Stillwater I have a big rotary switch to select the AC source. It has 4 settings, Shore 120V, Shore 240V, 8kW Gen, 20kW Gen. Each source also has its own main breaker on the panel.

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