Hello Christopher,
Thank you for your response to my inquiry.
I failed to mention that I intend to use the SG-500 in compressed voice SSB
mode, so it should draw about 40 amps with a 40% duty-factor. I realize power
draw will be significantly higher in digital, CW, AM modes, so if those modes
are required, exciter power would need to be reduced significantly to keep
amplifier power load within the operating parameters of my LiFePO4 battery
system based on this battery:
<http://www.electriccarpartscompany.com/New-Energy-60Ah-Aluminum-Encased-Battery>.
As my SG-500 will be part of a solar-powered portable station, the lighter
weight and flat discharge curve of LiFePO4 is preferable to lead-acid chemistry
for this application. The complexity of designing the battery management
system, on the other hand, is somewhat more complex. Fortunately, I enjoy a
challenge.
I'm curious about your reason for this statement:
"Those boosters are great for a voltage sensative rig in portable use,
putting a SG500 on one...not the best idea"
The photograph of WA1GZY's installation at the bottom of this page:
<https://www.qrz.com/db/WA1GZY> would appear to confirm that the SG-500 is a
reasonably functional choice.
According to the document here regarding LiFePO4 chemistry:
<http://www.cse.anl.gov/us-china-workshop-2011/pdfs/batteries/LiFePO4%20battery%20performances%20testing%20for%20BMS.pdf>
"Resistance is strongly influence by temperature. The lower temperature,
the higher resistance. The resistance at -20°C is 5 times greater than that
at 25°C.
The lower temperature the less available capacity, but when the temperature
is more than 15 °C, the available capacity is essentially the same. At 15°C
the available capacity is 98% of that at 25°C. The capacity remain 90% at
0°C. The capacity remain 74.5% (cut off voltage 2.5V) and 87% (cut off
voltage 2.0V) at -10°C . The capacity remain 56% (cut off voltage 2.5V) and
72% (cut off voltage 2.0V) at -20°C."
I mention this in the hope that in your location you may find it of interest.
Thank you for sharing your thoughts and experience with a recently licensed
amateur operator (July 2012).
Best regards,
Larry
WB6BBB
On Fri, 9 Sep 2016 12:28:26 -0800, "'Christopher E. Brown' cbrown@woods.net
[SGC-SmartPowerCube]" <SGC-SmartPowerCube@yahoogroups.com> wrote:
>
>The SG500 will draw > 90 amps for a 500+ watt carrier and > 100 amps on peaks
>at times.
>
>
>My shack supply is a deep-cycle bank with a 110amp supply specifically
>designed for batt
>bank management.
>
>Nominal 13.6VDC, 13.4VDC at keyup for a 500+ watt carrier dropping to 13.2VDC
>where it
>will hold forever.
>
>10M carrier limits to around 450, but everywhere else at least 500 while still
>clean and
>more like 650 peak down on 80M.
>
>
>Connect to a BATTERY with a proper charge system able to keep up with the AMP.
>
>ALT, a LARGE power supply capable of at least 110amps at 13.2 or more.
>
>
>Those boosters are great for a voltage sensative rig in portable use, putting
>a SG500 on
>one...not the best idea.
>
>On 9/9/2016 7:32 AM, Larry Dighera LDighera@att.net [SGC-SmartPowerCube] wrote:
>>
>> Has anyone experience using the N8XJK Super Booster
>> <http://stores.tgelectronics.org/the-n8xjk-super-booster/> with an SG-500
>> linear amplifier? The battery booster is rated at 40 amps and 16 volts
>> maximum.
>>
>> The SG-500 is rated for an input voltage of 14 VDC and an input ranger of 10
>> to
>> 18VDC: <http://www.sgcworld.com/ampProductPage.html>. Has anyone attempted
>> to
>> run the SG-500 at 18VDC? Can the booster do that without issues?
>>
>> Is the booster able to deal with the rapidly fluctuating 40 amp load the
>> SG-500
>> creates during SSB output?
>>
>> What is the optimal location to connect a 2 farad smoothing capacitor, at the
>> SG-500's power terminals, or at the power input to the battery booster?
>> Intuitively, I would think the amplifier's power input would be best, but
>> thought it couldn't hurt to inquire.
>>
>> Has anyone experienced timing issues between the booster's RF enable trigger
>> and the amplifier output?
>>
>> Best regards,
>> Larry
>> WB6BBB
>>
>>
>> ------------------------------------
>> Posted by: Larry Dighera <LDighera@att.net>
>> ------------------------------------
>>
>>
>> ------------------------------------
>>
>> Yahoo Groups Links
>>
>>
>>
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