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Old 12-23-2013, 02:12 PM   #1
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Genset while underway

My genset is in the stern as is the pickup for the genset. It has the mushroom pickup and is an Onan 7.5.

What do you all think of a genset running at cruise of say 7-9kts. We would only need this for say christmas lights or maybe baking underway.

We have a twin engine and I was wondering if the prop wash would interfere with the water flow of the genset pickup.

Any suggestions?
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Old 12-23-2013, 02:31 PM   #2
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Our Westerbeke 8kw is also at the stern. Bay Pelican is single engine and the prop is to the stern of the pickup for the generator. We occasionally run the geneset underway, usually at night. The prop wash does not appear to interfere with the genset's sea water pickup.

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Old 12-23-2013, 02:47 PM   #3
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They're designed to run underway. If there was any doubt by the builder you would see a big warning label along the lines "...DO NOT RUN WHEN THE BOAT IS UNDERWAY...." on the genny and in the owners manual. I bet there are no labels. Thus, run it as you need it and enjoy the cruise.
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Old 12-23-2013, 02:48 PM   #4
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I have a 7.5 Onan with the mushroom pickup as well. We don't normally run the gen set while underway, unless we need heat or are using the stove. But up to 10 knots the generator runs nice and cool. Downside to the mushroom intake with no guard is it will suck up debris, eels, eel grass and poppers, so visually check your sea strainer with a flashlight every couple of hours.
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Old 12-23-2013, 02:48 PM   #5
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Shouldn't be a problem unless you're planing

Seriously, we run ours all the time underway with no worries.

Make your life easier- change the electric stove out for a propane one!
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Old 12-23-2013, 05:12 PM   #6
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no problem unless you suck something up...and then the genset should shutdown before any damage except for an impeller.
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Old 12-23-2013, 06:16 PM   #7
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Our 12kw Onan has a water flow sensor that shuts it down if needed. We run it when moving if needed without even thinking about it.

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Old 12-23-2013, 06:24 PM   #8
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We do it with an Onan 6.5kw, never a problem. The auto protection is there, doubt you`ll need it.
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Old 12-23-2013, 06:46 PM   #9
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Do you turn your battery charger off when running genset underway? To avoid confusing the engine alternators, which would otherwise be 'seeing' multiple charging sources hitting the batteries?
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Old 12-23-2013, 07:24 PM   #10
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Very good question Aquabelle and I don't know the answer but think it should'nt be a problem.

Harbor Nights are you asking so you can be be a nice guy and not run your gen in the anchorage? If so I applaud your idea and probable practice.

Question:
If I was to get a small gen like a "Honda" how would I connect it to my boat? Just get the proper plug and plug it into the same receptacle as we do for shore power?
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Old 12-23-2013, 07:27 PM   #11
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Very good question Aquabelle and I don't know the answer but think it should'nt be a problem. Harbor Nights are you asking so you can be be a nice guy and not run your gen in the anchorage? If so I applaud your idea and probable practice. Question: If I was to get a small gen like a "Honda" how would I connect it to my boat? Just get the proper plug and plug it into the same receptacle as we do for shore power?
Yeah just get one of these.
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Old 12-23-2013, 07:52 PM   #12
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Quote:
Originally Posted by Harbor Nights View Post
My genset is in the stern as is the pickup for the genset. It has the mushroom pickup and is an Onan 7.5.

What do you all think of a genset running at cruise of say 7-9kts. We would only need this for say christmas lights or maybe baking underway.

We have a twin engine and I was wondering if the prop wash would interfere with the water flow of the genset pickup.

Any suggestions?
Won't your inverter/alts keep up with this?
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Old 12-23-2013, 08:16 PM   #13
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We have a Mastervolt system (actually 2 as we have 5 distinct battery systems) that takes various charging inputs and manages them.

Dave
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Old 12-23-2013, 09:02 PM   #14
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We always run the genset underway
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Old 12-23-2013, 09:04 PM   #15
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Quote:
Originally Posted by Aquabelle View Post
Do you turn your battery charger off when running genset underway? To avoid confusing the engine alternators, which would otherwise be 'seeing' multiple charging sources hitting the batteries?
Yep, always.
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Old 12-23-2013, 09:39 PM   #16
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Do you turn your battery charger off when running genset underway? To avoid confusing the engine alternators, which would otherwise be 'seeing' multiple charging sources hitting the batteries?
No, Xantrex charger with three battery bank circuits. Charger detects the alternator charge and will switch that bank into standby mode. Shut the engines down and the charger puts the battery bank back in charge mode.
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Old 12-23-2013, 09:58 PM   #17
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Quote:
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Do you turn your battery charger off when running genset underway? To avoid confusing the engine alternators, which would otherwise be 'seeing' multiple charging sources hitting the batteries?
Very good question and the answer can vary.

Those with a modern inverter have no problems for the reasons posted by others, however without an active inverter with the gen running and the 110 battery charger breaker on in conjunction with the alternators running and yes you can cause an issue, dont ask me how I know.
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Old 12-24-2013, 07:45 AM   #18
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Won't your inverter/alts keep up with this?

I'm guessing HN has no inverter.

We don't have one either, so for baking underway, genset on.

It happens our genset is on much of the time while underway, anyway, including at planing speeds... mostly to power the aircons... 'cause otherwise the saloon just gets too hot during late Jun/July/Aug/early Sep...

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Old 12-24-2013, 11:45 AM   #19
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After having to replace a charger and 4-8d's, I will not run the battery charger with engines on again. However anytime I run more than two hours my genny is on to power the engine room blowers, and of course my surveillance system so I can keep an eye on the Kiwi's.
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Old 12-24-2013, 12:14 PM   #20
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Not sure what actually causes any problems with alts and chargers on simultaneously...have run many a boat including mine with both going with no ill effects....
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