<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><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 type="cite"><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>
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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:
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<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>
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