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Old 01-08-2016, 11:16 AM   #101
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That's the other thing - I'm actually unsure of the hours on these units, don't think any have exceeded 1K yet - but other than oil changes and cleaning the air filter, we start them up and run them. Period.
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Old 01-08-2016, 08:21 PM   #102
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We are using a Honda EU1000i on deck for battery charging, vacuuming, and heating when necessary. It's main use is topping up the batteries in the evening and morning while at anchor and/or on docks with no power. We have a home made pad to set the Honda on to absorb the vibration, or I pull the inflatable alongside and put it in there. It uses little gas, starts on the first pull, and does not take up much space.

For those inboard installations - is it possible or common to run a coolant loop (fresh side) from the generator through the hot water heater, like many of our main engines are plumbed?

My thoughts are that you could run a bit smaller generator capacity that way, and use that engine heat instead of AC for the domestic hot water.
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Old 01-08-2016, 10:29 PM   #103
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back to FF and Art (# 70 & 71) - I use several Honda eu6500 gensets in my business. These work in industrial environments and are mostly running at max output. It is sometimes necessary to locate/operate them in more or less confined spaces (no, NOT OSHA confined spaces) that I think are very comparable if not more challenging environs than my engine room - close proximity to very hot vessels and piping, outdoors, lots of steam, etc. We have again and again cooled them with judicious use of a Kmart box fan or two , flex duct, and duct tape.

If my Kohler ever goes south, I will be replacing it with a Honda. 275#, 6.5 kw, $3500 NIB. I envision placing it in a box (the current Kohler is freestanding in the ER - not enough noise to warrant soundproofing - the Honda is amazingly quiet) with push/pull fans interlocked with the ON/OFF. Not sure I see the need to "marinize" anything.
I agree that the efficient Kohler 7.5 is quite quiet; I also do not have sound box. Thanks for tip on the "what if" replacement gen set. Wow... you put 6.5 kw Honda in a box... don't forget to turn it off when leaving the boat!
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Old 01-10-2016, 01:03 AM   #104
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Enclosure would be a better word. Want the ability to supply sufficient and controllable cooling air flow to the unit. Noise just isn't a concern with the 6.5 Hondas.
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Old 01-10-2016, 01:19 AM   #105
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Enclosure would be a better word. Want the ability to supply sufficient and controllable cooling air flow to the unit. Noise just isn't a concern with the 6.5 Hondas.
'
"Enclosure" Just so damn PC! - LOL
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Old 01-10-2016, 07:37 AM   #106
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"For those inboard installations - is it possible or common to run a coolant loop (fresh side) from the generator through the hot water heater, like many of our main engines are plumbed?"

Yes ,some folks only plumb in the noisemaker and not the main engine,as it may be on longer.

BUT if the noisemaker is small it can heat domestic hot water , but probably not be used to heat the vessel.

Using the noisemaker coolant for HW relieves a 1500W load from the unit , to use for other purposes or simply to spec a smaller unit.

Aft in the dink is an old trick for charter sail boats in the Carib.

No noise , no stench (for the charter party , the rest of the anchorage gets the noise and stink) and loads of juice!
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Old 01-10-2016, 08:42 AM   #107
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"

Aft in the dink is an old trick for charter sail boats in the Carib.

No noise , no stench (for the charter party , the rest of the anchorage gets the noise and stink) and loads of juice!
And no carbon monoxide either.
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Old 01-10-2016, 09:30 AM   #108
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"For those inboard installations - is it possible or common to run a coolant loop (fresh side) from the generator through the hot water heater, like many of our main engines are plumbed?"

Yes ,some folks only plumb in the noisemaker and not the main engine,as it may be on longer.

BUT if the noisemaker is small it can heat domestic hot water , but probably not be used to heat the vessel.

Using the noisemaker coolant for HW relieves a 1500W load from the unit , to use for other purposes or simply to spec a smaller unit.

Aft in the dink is an old trick for charter sail boats in the Carib.

No noise , no stench (for the charter party , the rest of the anchorage gets the noise and stink) and loads of juice!
Gennies don't make much heat, so not real practical to use its coolant to heat water. Also will tend to overcool the gennie, which is not good for it.

The whole point of using the main engine to heat water and/or cabin is to avoid needing to run the gennie much at all. The main engine provides heat and DC power to inverter for modest AC loads. In my case while cruising, gen might run an hour or so in the early am, an hour or so before bed, that's it.

Also, it's good for a gennie to run loaded. Water heater is a good tool for that.
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Old 01-10-2016, 10:18 AM   #109
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In my case while cruising, gen might run an hour or so in the early am, an hour or so before bed, that's it.

Also, it's good for a gennie to run loaded. Water heater is a good tool for that.

Agreed on run time and practiced on load (i.e. hot water, fridge, batts' charge, communication devices charge, stove/oven... etc.

I could never understand why persons sometimes run gen set for next to no reason. Why not take care of needed items all at once?

Saves on fuel, best to elongate gen's life span, keeps down the noise, limits exhaust
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Old 01-11-2016, 06:59 AM   #110
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"I could never understand why persons sometimes run gen set for next to no reason. Why not take care of needed items all at once?
Saves on fuel, best to elongate gen's life span, keeps down the noise, limits exhaust"

To be efficient a large good (expensive) inverter and large batt (expensive) bank are required, and planning.

For many just throwing the noisemaker on is easier , and even badly underloaded most will run 3,000- 4,000 hours , a long time with a 200 hour a year boat.
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Old 01-11-2016, 07:14 AM   #111
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I considered using the genset cooling system to heat water. Decided against it as it would mean I was totally dependent on the genset for hot water. When the genset is working I can heat water electrically. If the genset is down, I can use the main engine. With a combination of solar panels, wind generator and our auxiliary engines alternator we can charge the batteries so we have reasonable backups if the genset goes down.
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Old 01-12-2016, 07:18 AM   #112
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"Gennies don't make much heat, so not real practical to use its coolant to heat water."

Many buried noisemakers have diesel engines that usually put 1/3 of the diesel energy into the coolant.

At 1/2 GPH , with about 150,000 BTU in a gal of diesel ,,that would be 25,000 BTU for the hot water tank.

15A /120V is perhaps 5000 BTU so there is considerable energy to shorten the noisemaker ON time if desired .

If over cooling is a problem , as it usually is with a keel cooler, a similar bypass thermostat can be installed to keep the return water 150-160F.
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Old 01-12-2016, 01:17 PM   #113
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That ignores the flow rates and heat transfer characteristics of a water heater loop tied to the gennie. Only a fraction of the heat generated will get transferred to the water tank. You would need more than the typical half inch hoses and a big HX to make full use of the heat. Also, many gennies do not have convenient coolant taps for tstat bypass coolant flow like mains tend to have.

Also, a gennie makes very little heat when it is off. The main engine has to run to move the boat.

I think the consensus is it is more practical to plumb water and cabin heat off the main.

At slow cruise of 950 rpm, my cabin heater can sub cool the main engine. You feel the heat getting weak and coolant temp drops. Granted, it is a pretty big HX used for cabin heat.
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Old 01-12-2016, 11:10 PM   #114
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Same genset, 1980 vintage, same experience. To that I'll add:

Outside the boat, no-one even knows it's running. Inside, it'll rattle your teeth right out of your head. The sound shield is old and not very tight, so I'm not convinced it's helping much. My problems so far have been with the raw water system, hopefully I've got them all addressed now.

I'm not ready to invest in a Northern Lights. If you find a used boat with one of those installed, that would be a huge plus. I will bring a Honda 2000i on longer trips as a backup, and try to keep the Onan alive for as long as I can.

I think a Honda 2000i is just what we need, not having the room or need at this point for something larger.
But how is it connected to the boat. I don't see how you can charge the house bank. I admit electrical issues are not my strong suit.
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Old 01-13-2016, 12:17 AM   #115
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I think a Honda 2000i is just what we need, not having the room or need at this point for something larger.
But how is it connected to the boat. I don't see how you can charge the house bank. I admit electrical issues are not my strong suit.
Just plug your shore-tie in to the Honda, and your on-board charger will do its job.

Before you move forward, you may wish to look up the consumption of your battery charger and ensure it does not exceed the output of the Honda. You should find this in your charger manual, or check online for a manual.

Our charger is fairly small and our Honda EU 1000i is able to power it. I would expect you have a larger charger than mine.

Please send me a PM if you desire direct assistance.
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Old 01-13-2016, 08:33 AM   #116
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"That ignores the flow rates and heat transfer characteristics of a water heater loop tied to the gennie. Only a fraction of the heat generated will get transferred to the water tank."

RIGHT!, the noisemaker will heat domestic water at the same speed as the main engine.

Then the question becomes which gets the most hours during the usual cruise,

And can the noisemaker do something useful with the 15A not required to heat water.
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