Today's Message Index:
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1. 07:49 AM - Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (Airdog77)
2. 10:34 AM - Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (Eric Page)
3. 10:34 AM - Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (Eric Page)
4. 11:01 AM - Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (Airdog77)
5. 02:59 PM - Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (user9253)
6. 03:39 PM - Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= Slump =?ISO-8859-1?Q?Eliminator=9D? (Airdog77)
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| Subject: | Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= |
Slump =?ISO-8859-1?Q?Eliminator=9D?
Eric,
I'm looking for something like this specifically for my GNS480 GPS. Do you think
your Slump Eliminator could handle a 480?
I checked the 480 manual and all I could find on power requirements is a voltage
range of 10-36 volts.
If your device can support a 480 during start, then I definitely want one!
Thanks,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476132#476132
Message 2
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| Subject: | Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= |
Slump =?ISO-8859-1?Q?Eliminator=9D?
Ward,
I chose capacitors for the device based on another member's request to support
an MGL Xtreme EFIS/EMS unit, which draws ~200mA and will operate down to 8V.
Going by the specifications in the installation manual...
http://www.aeroelectric.com/Installation_Data/Garmin/GNS480_IM.pdf
...in section 1.3 on page 1-6, we see that the GNS480 requires a minimum of 10V.
Adding the three power inputs (Main, VHF Nav and Comm) together, the total
"typical" current draw is 2.12A. Those minimum values probably assume that the
boot sequence is complete, the GPS receivers are locked and the processor is
mostly idle. It also assumes that it's warm enough that the backlight heater
is off; add another 0.8A for the heater in low ambient temps.
With those numbers, the Voltage Slump Eliminator would support a GNS480 for somewhere
between 1/2 and 3/4 of a second; so, not very useful.
If it's possible to power only the "Main" input to the GNS480 and leave the VHF
Nav and Comm sections unpowered until after engine start, then the situation
improves a bit: ~1.1 second.
It would certainly be possible to source much larger supercapacitors and make the
circuit work at higher loads, but it would take about 12 Farads to get the
same performance at a 2.12A load down to 10V that the 0.625-Farad design achieves
at a 200mA load down to 8V. That much capacitance would be significantly
larger -- and perhaps heavier -- than a small battery.
In this case, it looks like a lead-acid battery or one of the TCW Li-Fe-PO packs...
http://www.tcwtech.com/ibbs_integrated_backup_battery_system_3ah_6ah.html
...might be your best bet.
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476184#476184
Message 3
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| Subject: | Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= |
Slump =?ISO-8859-1?Q?Eliminator=9D?
Ward,
I chose capacitors for the device based on another member's request to support
an MGL Xtreme EFIS/EMS unit, which draws ~200mA and will operate down to 8V.
Going by the specifications in the installation manual...
http://www.aeroelectric.com/Installation_Data/Garmin/GNS480_IM.pdf
...in section 1.3 on page 1-6, we see that the GNS480 requires a minimum of 10V.
Adding the three power inputs (Main, VHF Nav and Comm) together, the total
"typical" current draw is 2.12A. Those minimum values probably assume that the
boot sequence is complete, the GPS receivers are locked and the processor is
mostly idle. It also assumes that it's warm enough that the backlight heater
is off; add another 0.8A for the heater in low ambient temps.
With those numbers, the Voltage Slump Eliminator would support a GNS480 for somewhere
between 1/2 and 3/4 of a second; so, not very useful.
If it's possible to power only the "Main" input to the GNS480 and leave the VHF
Nav and Comm sections unpowered until after engine start, then the situation
improves a bit: ~1.1 second.
It would certainly be possible to source much larger supercapacitors and make the
circuit work at higher loads, but it would take about 12 Farads to get the
same performance at a 2.12A load down to 10V that the 0.625-Farad design achieves
at a 200mA load down to 8V. That much capacitance would be significantly
larger -- and perhaps heavier -- than a small battery.
In this case, it looks like a lead-acid battery or one of the TCW Li-Fe-PO packs...
http://www.tcwtech.com/ibbs_integrated_backup_battery_system_3ah_6ah.html
...might be your best bet.
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476183#476183
Message 4
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| Subject: | Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= |
Slump =?ISO-8859-1?Q?Eliminator=9D?
Eric,
Thanks for assessing this! I already have TCW's 3AH IBBS, but alas, it's full
up ;)
I also looked at their Intelligent Power Stabilizer, and for significantly less
cost thought I'd check on your system first. I did note in TCW's IPS install
manual that for Garmin GPS units it only calls for hooking up the main power
connection, and not the VHF Nav/Com, as you highlighted as well.
As many builders/pilots have noted, I simply don't want to be burning unnecessary
fuel while inputing a flight plan.
Thanks!
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476185#476185
Message 5
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| Subject: | Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= |
Slump =?ISO-8859-1?Q?Eliminator=9D?
Wade,
I think that the new and improved deslumpifier is worth a try with your GNS480.
I connected the original design by Eric Jones to my Dynon D-180 and it was borderline.
Sometimes it prevented brownout and sometimes not. According to the
D-180 installation manual, the D-180 draws 1.5 amps.
1/2 to 3/4 second of protection might be long enough. The starter motor draws
lots of current at first. But as it comes up to speed, it draws less and less.
So the battery voltage only sags for a short time. Bob N has conducted tests
and recorded data pertaining to starter current and voltage sag. Perhaps
he will give his opinion on the length of time that the battery voltage sags
below 10 volts. If the avionics were wired with dedicated conductors from the
battery instead of sharing the current path with the starter motor, then the
voltage drop to the avionics would be less. That discrete avionics current
path could be accomplished via an E-Bus or a separate relay.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476192#476192
Message 6
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| Subject: | Re: EFIS/EMS Brownout/Reboot: =?ISO-8859-1?Q?=9CVoltage?= |
Slump =?ISO-8859-1?Q?Eliminator=9D?
Thanks Joe, good gouge.
My starting circuit and Main/E-Bus feed split right at the master contactor, so
I'm thinking that's in line with what you're saying. Moreover, I could connect
it right off the battery bus if need be.
Eric - not to barge into your proverbial kitchen and mess up the recipe, but is
there any way to squeak just a bit more capacitance out of your/Eric's design?
I'll promise not to hook up the VHF Nav/COM! ;)
Either way, I'll take a unit to test out... but if you could supercharge one just
a bit that'd be awesome (of course I'd pay whatever the cost difference is).
Thanks again guys!
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476193#476193
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