[PSUBS-MAILIST] (no subject)
Sean T. Stevenson via Personal_Submersibles
personal_submersibles at psubs.org
Sun Mar 8 22:09:17 EDT 2020
AGMs typically require lower charge rates and lower final voltages than flooded cells. Check the literature for your particular batteries, but I'm thinking I wouldn't want to go any faster than C/5 for bulk charge. Look for a charger intended specifically for AGMs. They top out around 13.7 V instead of 14.5.
Always best to conform to the manufacturer data. More expensive chargers have temperature compensation, because you need to adjust voltage per cell a bit for temperature. Lead-acid of any description usually have a constant current bulk charging phase, a voltage limited saturation phase, and then a float. Best to use a charger suited to your battery size, because charging too slowly can also cause longevity issues.
Here's a good resource for general battery information:
https://batteryuniversity.com/learn/
Sean
-------- Original Message --------
On Mar. 8, 2020, 17:27, Rick Patton via Personal_Submersibles wrote:
> don't know much about batteries but I haven't bought them yet. There gonna be AGM 12 volt batteries so good idea about contacting the manufacturer to see what they say. Boat won't be used commercially so would be several days in between dives at least so maybe a 2 and 10 amp charge setting would be ok?
> Rick
>
> On Sun, Mar 8, 2020 at 11:24 AM Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>> Rick,
>> If you want to use your submarine semi-commercially or do multiple dives
>> in a day I would go for a charger with a higher amp rating for a faster charge;
>> however there would be a limit, as if you charged them too fast the batteries
>> would off gas more. I am not sure what batteries you have, but there would
>> probably be data on charging rates. Maybe look at how fast you could charge
>> them with chargers of varying amp ratings & factor that in.
>> If you have time & are going to charge them overnight then ignore the above.
>> Alan
>>
>> On 9/03/2020, at 9:16 AM, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>> Hey guys, any other feed back on what you use for a battery charger for 12 or 36 volts, Sean, whats your input?
>>> Rick
>>>
>>> On Sun, Mar 8, 2020 at 9:48 AM Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>>> Alan, According to the specs an my batteries is shows a low voltage of 5 volts . But better battery life if discharged less than 50 %
>>>>
>>>> https://resources.fullriverbattery.com/fullriver-battery/external-media/spec-sheets/DC220-6.pdf
>>>>
>>>> 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 21:29:48 +1300
>>>>
>>>> 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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>>>>>>>>
>>>>>>>> https://www.youtube.com/watch?v=dHDUilUO6P8
>>>>>>>>
>>>>>>>> How To Make An Underwater Submarine LED Light Bar
>>>>>>>>
>>>>>>>> In this video I am converting an everyday LED light bar into the deep diving, oil filled, underwater light bar t...
>>>>>>>>
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