[PSUBS-MAILIST] (no subject)

Sun Mar 8 04:29:48 EDT 2020

Brian,
It is recommended not to take lead acid batteries below 50% charge,  or 12.2V.
So 48.8V.
However when you have a heavy load on them they indicate a lower voltage than
what they will be if you stop the motor & let them recover.
Alan

> On 8/03/2020, at 7:04 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> David,   yes I'm running off my batteries, they are AGM, I have eight  240  ah  batteries.  I'm not sure how low I can go with the voltage,   I believe the storage indicator has a low limit where it would read zero, but I'm pretty sure the motors will run on 36 volts,  there is most likely a recommended low voltage for the 12 volt batteries.   I ran them for 6 hours and the storage indicator was telling me 40% full.  Voltage was 44.3  
> 
> Rick,  this is the battery charger I have:   https://www.batterypete.com/chargers/golf-carts/delta-q-quiq-48-volt-18-amp-912-4800/?gclid=Cj0KCQiAqY3zBRDQARIsAJeCVxP7pOTpKjANY_Z4leDJMXsag_kgsFsDIKImLms-Qd7CIh43hEoq7_oaAruDEALw_wcB
> 
> Brian
> 
> 
> 
>   
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: David Colombo via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] (no subject)
> Date: Sat, 7 Mar 2020 21:02:11 -0800
> 
> Brian, are you running them from your actual batteries? Are they deep cycle lead AGM, or LIPO4? What's the cut off voltage?
> David
> 
> On Sat, Mar 7, 2020, 7:58 PM Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> It's been 4 hours now and my voltage is at 46.44 volts
> 
> 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] (no subject)
> Date: Sun, 8 Mar 2020 15:48:43 +1300
> 
> Hi Brian,
> 3hp is 2,200W, so 500W with no load seems excessively high.
> Just measured mine & it's .9Amps (900mAh) for a 1500W compensated motor running in a 5cst silicone oil. Running off 48V also. So under 49W.
> I think you have a large prop on your motors. I just saw your gearing ratio, but the
> loss shouldn't be that much.
> I would test them individually in case one is at fault.
> Cheers Alan
> 
> On 8/03/2020, at 2:54 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,             They are 3 hp golf cart motors, true there is no load but If I kept the same amp draw while actually at sea then it seems it would be equivalent.     Under actual conditions it would probably be going very slowly while drawing 21 amps ( 10.5 amps per motor ) .  
> 
> 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] (no subject)
> Date: Sun, 8 Mar 2020 14:21:54 +1300
> 
> Brian,
> I take it that there is no load on the motor!
> That seems a high power consumption, 500 Watts per motor.
> Have you got the specs for those motors? Have you checked them individually?
> Alan
> 
> On 8/03/2020, at 1:26 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> There are some times when 110 vac could be needed, like computer stuff.   Just a thought, we can have an open mind on the subject !  
> 
> 
>   Right now I'm running my motors to see how long they'll go.  It's a kind of cool rainy day so the temperature is close to what the ocean would be .   I've got the oil expansion tube going into a bucket so I can get an idea how large of a reservoir I will need to take care of the expansion.  I think I'm going to opt for just a reservoir on the motor side and then I'm running a hose up high and then back down to take care of the compression up the tube for when I submerge.  Since most of the compression of air will occur in the first 30' the water should never get high enough ( in the tube) to go over the hump and get into the motor compartment.   So the whole system will be open .    I'm also monitoring Voltage ,  Amp draw, and ,  Watts     48 volts       21 amps       1030  watts    - two motors running  .
> 
>   
> 
> 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] (no subject)
> Date: Sun, 8 Mar 2020 00:06:47 +0000 (UTC)
> 
> Why complicate a simple solution?  this works great!  Bad Brian!
> 
> Hank
> 
> On Saturday, March 7, 2020, 4:59:49 PM MST, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> There are a lot of 110AC led's out there , it would be a simple matter to run a DC inverter to make 110ac voltage ,  I wonder if there would be any advantage to that,  there might be some better quality led's that are made for AC voltage, Any thoughts on that?
> 
> Brian
> 
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] (no subject)
> Date: Sat, 7 Mar 2020 16:30:26 +0000 (UTC)
> 
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