[PSUBS-MAILIST] 48VDC generator

Wed Sep 12 12:12:00 EDT 2018

Brian
I have thought about fabricating small rudder planes on my 3 thrusters as
well especially the aft one as I figured anything could only help aid the
thruster in directional change but I recall others in the past saying that
wasn’t the case but I forgot why? More feedback appreciated
Rick

On Wed, Sep 12, 2018 at 9:01 AM Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan,
>
>    I've though about using a small out board but I have no rudders, my
> motor pods turn .   But you've got me thinking,  maybe if I attached rudder
> planes on to the motor pods I could effect directional change , then I
> could have a single source outboard on the back of the sub.  I still would
> have to figure out a way to disconnect the outboard and all of those
> logistics however.
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] 48VDC generator
> Date: Wed, 12 Sep 2018 18:57:09 +1200
>
> Brian,
> you could but hybrid cars do both. It's just a matter of delving in to
> the technology & knowing what's required to make it happen.
> However if you are just powering your motors from a generator you
> may as well just use an outboard motor that is designed for a marine
> environment to push you along. ( have you got one on your yacht)
> Alan
>
>
>
> On 12/09/2018, at 5:47 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,        That's very interesting.  I guess the issue is that the
> batteries can only accept so much current depending on what state of charge
> they are at.  If the motors are using that power then it's not a problem
> but the power needs to be regulated.  Maybe another way would be to isolate
> the batteries while using the remote power.
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] 48VDC generator
> Date: Wed, 12 Sep 2018 12:49:33 +1200
>
> Brian,
> in this video the guy is just charging a battery bank off a generator.
> He has a massive blue capacitor & electronics in the system.
> https://m.youtube.com/watch?v=1CvYcCUZqOI
> I don't know enough to advise you, only to warn you that it might not
> be that easy & needs a bit of investigating. The current would need to be
> regulated to the batteries. My 48V 40A rectifier cost me NZ $800-.
> Carsten may know a bit about this with his diesel electric sub.
> I would be interested in what you find out.
> Alan
>
>
> On 12/09/2018, at 10:22 AM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,        Maybe I could just put an appropriate sized one way diode so
> current does not flow to the batteries.  Maybe there is some other device
> that would be better for such a sizeable current rather that a diode
> however.
>
> Possibly the generator people would have the answer for this.
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] 48VDC generator
> Date: Wed, 12 Sep 2018 07:39:02 +1200
>
> Brian,
> it could be complicated. I was going to suggest having a switch to
> switch from charging the batteries to running the motors, as you
> may need to restrict the amps going in to the batteries depending
> on their rating. However you may recall me posting about keeping
> battery to controller wire length short to avoid large voltage
> spikes in DC systems. You would have a very long wire length from
> the generator to the motor controller carrying DC. A battery can act
> like a large capacitor to absorb voltage spikes, so maybe it does
> need to be incorporated in the system. It may be that you need an
> AC generator & a rectifier nearer the motor controller. Voltage spikes
> from the motors could be a problem but I guess your motor controller
> takes care of this. Some motor controllers have regenerative breaking
> that feeds power from the motor as it slows down, back to the battery.
> This is probably not a problem with a sub as you wouldn't get back
> emf like you would from a car running down hill, however I test my
> motors from a 48V rectifier & they advise to turn off regeneration on
> my motor controllers in case it wrecks the rectifier.
> There should be a lot of information available as off grid people
> combine generators, battery banks & other forms of power generation.
> Cheers Alan
>
>
>
>
> On 12/09/2018, at 5:17 AM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hank,    I remember you talking about that,  I was thinking of getting a
> dedicated 48 vdc generator and hooking into the battery bank through the
> hatch and then disconnecting to submerge.
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] 48VDC generator
> Date: Tue, 11 Sep 2018 11:34:06 +0000 (UTC)
>
> Brian,
> That was my plan at one time also, I was going to use alternators with
> internal regulators.  It should work, but I am not sure how long the
> alternators will last if they are not sized correctly.
> Hank
>
> On Monday, September 10, 2018, 11:20:59 PM MDT, Brian Cox via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi All,
>                      Does anyone know what's involved in linking a 48 volt
> dc generator to ones 48 Volt drive system?   Is it as simple as connecting
> to the batteries?  If the generator senses a voltage draw then it engages,
> this is how most generators are set up .  Seems like there's got to be some
> sort of protection for the batteries so they don't see too much voltage.
> I was thinking of having a 48 V dc generator in an inflatable secured to my
> deck and feeding my motors for surface transit.  Then once at the dive site
> leave the inflatable floating at the dive site.
>
> Brian
>
>
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