danstanford

Connect with J/88 Oceanvolt owner?

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I have bought but not yet picked up an Oceanvolt equipped J/88 and I want to extend the range through a portable Honda generator but want to talk to someone who has done this. There are 3 choices and I would like to make the right one for the few times I am ever going to need the extended range. 

2200i watt standalone

3000i watt standalone

2x2200i twinned together.

Ideally I would like to be able to make 5 knots under power basically continuously. The 4x6Kwh batteries on board are supposed to give me about 4 hours of range at 5 knots but I don't know what the math is to determine what I need but I think that would indicate 6000 watts continuously.

Can anyone connect me to someone who knows? Ideally someone with this model of boat.  

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Does the Oceanvolt charge with 12V or 120V?   The Honda will put out very low 12V as I recall.     Not quite my moms hybrid.

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In this situation I will be connecting the generator to the battery charger at 120v. The generator has a connector in the face of it which matches the one at the marina (30a marine connector).

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If the generator has a 30a receptacle it most likely is 240v, not 120v like at the dock......Also, if you tandem 2 2200i units you will be at 240v output.....match the wattage output of the generator to that of the charger.  The charger should be sized to match the output of the ocean volt, to maintain continuous running.

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Is the J/88 you bought blue?

If so I would go searching for evidence of 12 Metre paint scuffs around it...because that boat was run over by 60,000lbs of aluminum a few years ago.

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3 hours ago, SEC16518 said:

If the generator has a 30a receptacle it most likely is 240v, not 120v like at the dock......Also, if you tandem 2 2200i units you will be at 240v output.....match the wattage output of the generator to that of the charger.  The charger should be sized to match the output of the ocean volt, to maintain continuous running.

Interesting point but as far as I can tell it is incorrect. Still trying to confirm the 240v part, but for sure the 30a connector is 125v on the companion model and I cannot find anywhere that it says this becomes 240v when they are twinned together. I would think this would be a critical thing for anyone since you connect the two generators together using an umbilical and still just use the one connector. 

If anyone has any input, please jump in. 

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You cannot put two separate AC power generators in series or parallel to get more power from them, AC is not at all like DC power supplies.

What capacity is your charger?

This will determine what AC power you need. Most battery chargers on smaller boats draw less than 15 amps (AC) at full load (note that chargers are labelled based on their DC output), they are designed this way so that they can run off normal shore power. If you have a monstrous AC charger capable of running off of 30 amp circuit (with a load of more than 15 amps) then you will need to look at a much larger generator that can output that kind of power.

Most likely the 2200i will do the job of charging your batteries, but may not be able to supply sufficient power to actually run the boat constantly.

I have looked into this idea before and thus far have not found a way to make a hybrid that can actually operate off of a small portable generator for long periods of time.

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The Honda inverter gensets CAN be linked together WITH a parallel cord to double the output amps. Voltage stays the same.

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15 hours ago, danstanford said:

Interesting point but as far as I can tell it is incorrect. Still trying to confirm the 240v part, but for sure the 30a connector is 125v on the companion model and I cannot find anywhere that it says this becomes 240v when they are twinned together. I would think this would be a critical thing for anyone since you connect the two generators together using an umbilical and still just use the one connector. 

If anyone has any input, please jump in. 

Yes, you are right....just looked this up.  Why would you want to combine 2 generators vs just buying 1 that is large enough?

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Isn't all of this an argument for buying one with a conventional diesel donk rather than trying to retrofit a U-boat style diesel electric transmission?

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1 hour ago, SEC16518 said:

Yes, you are right....just looked this up.  Why would you want to combine 2 generators vs just buying 1 that is large enough?

slinging one off the dock into your mates paws 

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23 hours ago, Snowden said:

Isn't all of this an argument for buying one with a conventional diesel donk rather than trying to retrofit a U-boat style diesel electric transmission?

Snowden, all of the sailing I have done in the last 2 years could comfortably be done with the electric and batteries with less noise, easier winterization, and it is something I find interesting. However, longer range when needed is the principle objection by most to electric power and in this case I have a 70nm trip to take to get her home so I would like to figure this out in a sensible way. The generator would only be on board when I was headed off on a cruise and don't want to be trapped by wind conditions.

Getting off the dock and out to the starting line is the principle role of this power system and it looks like it will be perfect for that. Sailing is the point of the boat so I hope I never need the generator but it just makes sense to me to solve this problem if I can.

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Why not give Oceanvolt a call? I suspect they know the installation, expected current draw of the system and required generator to provide sufficient power for longer duration use.

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