[PSUBS-MAILIST] Magnacom SW-1000-sc Battery

[Alan James via Personal_Submersibles]

 David, the electronics may be a low voltage protection circuit, or a low high voltage protection circuit so you don't overcharge the batteries. As Sean says, if you replace with lithium you have to match the battery voltage. Lithium Iron batteries have a nominal voltage of 3.7 but can be charged to 4.2, & discharged to a minimum of 3V. So that gives 2 options, a 3 cel or 4 cel configuration. So 4 cel would be just above 16.6V and could be used down  to 12V (very minimum) or 3 cel 12.6V & 9V minimum. Alan
    On Saturday, December 19, 2020, 09:24:43 AM GMT+13, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi Alan, The unit in the sub I can. The topside unit I was hoping to keep the unit intact in case it could also be used as a diver unit.
Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com



On Fri, Dec 18, 2020 at 12:03 PM Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 David, can you just wire them in to 12V in the boat & forget about the battery packs, or are you intending to use them for scuba diving. Alan
    On Thursday, December 17, 2020, 06:39:22 AM GMT+13, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi guys, I torn down the one battery I got with my magnacom units so I can build a couple more.  Attached are photos of the teardown. Only problem is one component that only had labeling on one side. The other side had only the letters va with a smudge over other data. I think it's a fuse based on the fact it interrupts the circuit.  I sketched out the circuit for reference. I thought taught there might be a BMS, but apparently not.  Jon, to recreate the circuit board component, would you recommend having done by a fabricator? Any ideas or thoughts would be appreciated.Thanks,David_______________________________________________
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