<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>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.</DIV><DIV> </DIV><DIV>Possibly the generator people would have the answer for this.</DIV><DIV> </DIV><DIV>Brian</DIV><DIV> </DIV><DIV><BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: Alan via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR>Subject: Re: [PSUBS-MAILIST] 48VDC generator<BR>Date: Wed, 12 Sep 2018 07:39:02 +1200<BR><BR></DIV><DIV></DIV><DIV>Brian,</DIV><DIV>it could be complicated. I was going to suggest having a switch to</DIV><DIV>switch from charging the batteries to running the motors, as you</DIV><DIV>may need to restrict the amps going in to the batteries depending</DIV><DIV>on their rating. However you may recall me posting about keeping</DIV><DIV>battery to controller wire length short to avoid large voltage</DIV><DIV>spikes in DC systems. You would have a very long wire length from</DIV><DIV>the generator to the motor controller carrying DC. A battery can act</DIV><DIV>like a large capacitor to absorb voltage spikes, so maybe it does</DIV><DIV>need to be incorporated in the system. It may be that you need an </DIV><DIV>AC generator & a rectifier nearer the motor controller. Voltage spikes</DIV><DIV>from the motors could be a problem but I guess your motor controller</DIV><DIV>takes care of this. Some motor controllers have regenerative breaking</DIV><DIV>that feeds power from the motor as it slows down, back to the battery.</DIV><DIV>This is probably not a problem with a sub as you wouldn't get back</DIV><DIV>emf like you would from a car running down hill, however I test my</DIV><DIV>motors from a 48V rectifier & they advise to turn off regeneration on</DIV><DIV>my motor controllers in case it wrecks the rectifier. </DIV><DIV>There should be a lot of information available as off grid people </DIV><DIV>combine generators, battery banks & other forms of power generation.</DIV><DIV>Cheers Alan</DIV><DIV><BR></DIV><DIV><BR></DIV><DIV><BR></DIV><DIV><BR>On 12/09/2018, at 5:17 AM, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:<BR><BR></DIV><BLOCKQUOTE><DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>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.</DIV><DIV> </DIV><DIV>Brian</DIV><DIV> </DIV><DIV><BR><BR>--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:<BR><BR>From: hank pronk via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>To: Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>Subject: Re: [PSUBS-MAILIST] 48VDC generator<BR>Date: Tue, 11 Sep 2018 11:34:06 +0000 (UTC)<BR><BR></DIV><DIV style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><DIV style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><DIV></DIV>
<DIV>Brian,</DIV><DIV>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.</DIV><DIV>Hank</DIV><DIV><BR></DIV>
</DIV><DIV>
<DIV style="color: rgb(38, 40, 42); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 13px;">
<DIV>
On Monday, September 10, 2018, 11:20:59 PM MDT, Brian Cox via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>> wrote:
</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><DIV><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><DIV>Hi All,</DIV><DIV> 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. </DIV><DIV> </DIV><DIV>Brian</DIV><DIV> </DIV><DIV> </DIV></DIV>
</DIV>_______________________________________________<BR>Personal_Submersibles mailing list<BR><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></DIV>
</DIV>
</DIV></DIV>_______________________________________________
Personal_Submersibles mailing list
<A>Personal_Submersibles@psubs.org</A>
<A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A>
</DIV>
</DIV></BLOCKQUOTE><BLOCKQUOTE><DIV><SPAN>_______________________________________________</SPAN><BR><SPAN>Personal_Submersibles mailing list</SPAN><BR><SPAN><A href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A></SPAN><BR><SPAN><A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A></SPAN><BR></DIV></BLOCKQUOTE>_______________________________________________
Personal_Submersibles mailing list
<A href="/eonapps/ft/wm/page/compose?send_to=Personal_Submersibles%40psubs.org">Personal_Submersibles@psubs.org</A>
<A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A>
</DIV>