[450] The link on batteries

[David McKenzie]

made it 5 hours 8 minutes.


On Thu, Oct 10, 2013 at 7:33 PM, David McKenzie <k1fsy at vhfwiki.com> wrote:

> i dont think the link sees much stress. the wifi is transmitting and
> reeving and the sound card is blinking, though.
>
>
> On Thu, Oct 10, 2013 at 7:25 PM, John Foege <john.foege at gmail.com> wrote:
>
>> Nice load averages...but is anyone actually stressing the link??
>>
>>
>> On Fri, Oct 11, 2013 at 1:10 AM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>
>>>  23:09:52 up  3:23,  1 user,  load average: 0.40, 0.38, 0.40
>>> Thu Oct 10 23:09:52 UTC 2013
>>>
>>>
>>>
>>> On Thu, Oct 10, 2013 at 4:38 PM, John Foege <john.foege at gmail.com>wrote:
>>>
>>>> I'm curious what the objective of this whole experiment is??
>>>>
>>>> I could understand hooking up a deep-cycle gel cell marine battery or
>>>> something + a charging system + a 13.8V PSU = the link electronics /
>>>> transceiver would run 24/7 and have battery backup for power outages...
>>>>
>>>> But, I'm just curious in general what the point of fooling around with
>>>> a step-down converter and a long line of AAs is?? I'm not understanding
>>>> what the idea is.
>>>>
>>>> And, secondly, is it really a concern whether or not the link can run
>>>> on battery power? Or are you still thinking about Chris' suggestion of
>>>> using a big fat solar panel + a gel cell + charging system and making a
>>>> portable unit that can be hoisted up into a tree, etc. ?
>>>>
>>>>
>>>> On Thu, Oct 10, 2013 at 10:27 PM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>>>
>>>>> I'm currently testing it with 8x generic AAs in series. So that's
>>>>> probably about 2500mA @ 12v. The raspi with wifi/soundcard running the link
>>>>> with my ssh session open is drawing around 275mA average from the batteries
>>>>> measured on the battery side of the dc/dc converter. It's been up for about
>>>>> 40 minutes and the batteries are reading a steady 12.01 volts. I don't know
>>>>> how long it will take before Vin < Vout (it just passes through lower than
>>>>> set voltage) will be enough to turn off but a back of the hand calculation
>>>>> of 2500mAh / 275mA = about 9 hours of run time.
>>>>>
>>>>>
>>>>> On Thu, Oct 10, 2013 at 12:05 AM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>>>>
>>>>>> no, ~5.6v (because AAs run hot) down to 5v.
>>>>>>
>>>>>> that's a LM2596 switching regulator board; Vin > Vout only. I have 10
>>>>>> of them now. Supposedly something like 95% efficient. That's an 8-cell
>>>>>> battery pack I should load it up and give it another test.
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 9, 2013 at 11:50 PM, John Foege <john.foege at gmail.com>wrote:
>>>>>>
>>>>>>> 4 AAs in series? 5.2V to 12V DC-DC regulator?
>>>>>>>
>>>>>>> Can you set it for 1.3V to 13V and run the batts in parallel?
>>>>>>>
>>>>>>> I'm assuming this doesn't make any difference in run-time due to
>>>>>>> either having a 1800 mAh 5.2V cell or a 1.3V 7200 mAh cell with the
>>>>>>> converter...unless I'm having a massive brain fart...
>>>>>>> On Oct 10, 2013 12:04 AM, "David McKenzie" <k1fsy at vhfwiki.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>>  Got the switching regulator modules from China. It ran for 3 mind
>>>>>>>> on those 4 nearly dead AAs :)
>>>>>>>>
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>>>>>>
>>>>>
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