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#11
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Battery question
On Sunday, June 21, 2020 at 11:42:58 AM UTC-4, kinsell wrote:
On 6/21/20 8:18 AM, wrote: On Sunday, June 21, 2020 at 12:13:51 AM UTC-4, SoaringXCellence wrote: Another item on your list has a very high current draw: The Stratux is based on a Raspberry Pi and those have more current draw than most of the rest of your panel! I have a 15000mAh LimeFuel external pack I run with my Stratux (Pi 3 based). It goes too low for effective operation of the Pi in about 4.5 hours.. The spec for the Pi says it needs a 2.5 Amp 5-volt power supply. But I have found that some of the Pi devices have lower current needs, and especially if you are making your own Stratux, you should check out a few different units and pick the one with the lowest power draw. The Stratux software will run on a Pi 2 or 3. The Pi 4 is definitely over kill and uses the most power of the bunch. Mike Talking about watt-hours, a "12V" LFP battery outputs 13.x volts through most of its discharge, thus outputs somewhat more watt-hours than an SLA that yields the same amp-hours. Most of our modern avionics use less current when fed a higher voltage, very unlike ye olde light bulb. I've measured that behavior in my Portable PowerFLARM, for example. The OP said he was using a 14 volt SLA, which I suppose proves how he absolutely must use SLA. - not necessarily. Some of the older radios misbehaved when the "12V" SLAs were depleted down to under 12V. So people used 7-cell "14V" SLAs. With the LFP batteries maintaining above 13V through their discharge, I believe those 14V SLAs can be abandoned. Not to mention that very few of those old balky radios are still in service. |
#12
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Battery question
On Sunday, June 21, 2020 at 8:48:18 AM UTC-7, wrote:
On Sunday, June 21, 2020 at 11:42:58 AM UTC-4, kinsell wrote: On 6/21/20 8:18 AM, wrote: On Sunday, June 21, 2020 at 12:13:51 AM UTC-4, SoaringXCellence wrote: Another item on your list has a very high current draw: The Stratux is based on a Raspberry Pi and those have more current draw than most of the rest of your panel! I have a 15000mAh LimeFuel external pack I run with my Stratux (Pi 3 based). It goes too low for effective operation of the Pi in about 4.5 hours. The spec for the Pi says it needs a 2.5 Amp 5-volt power supply. But I have found that some of the Pi devices have lower current needs, and especially if you are making your own Stratux, you should check out a few different units and pick the one with the lowest power draw. The Stratux software will run on a Pi 2 or 3. The Pi 4 is definitely over kill and uses the most power of the bunch. Mike Talking about watt-hours, a "12V" LFP battery outputs 13.x volts through most of its discharge, thus outputs somewhat more watt-hours than an SLA that yields the same amp-hours. Most of our modern avionics use less current when fed a higher voltage, very unlike ye olde light bulb. I've measured that behavior in my Portable PowerFLARM, for example. The OP said he was using a 14 volt SLA, which I suppose proves how he absolutely must use SLA. - not necessarily. Some of the older radios misbehaved when the "12V" SLAs were depleted down to under 12V. So people used 7-cell "14V" SLAs. With the LFP batteries maintaining above 13V through their discharge, I believe those 14V SLAs can be abandoned. Not to mention that very few of those old balky radios are still in service. They better not be in service because they are illegal to use and have been illegal for many year.. |
#13
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The SLA was powering an old radio yes. I would like to keep using the Stratux with Foreflight . It's also nice to have all the airport/weather info with a touch . It also has AHHRS ,I'm not planning on cloud flying but it's there if needed. I am exploring Flarm purchase . Is there a Power Flarm that will give voice alerts with direction ? Currently I'll get a pretty specific warning "Traffic 12 O clock one mile same altitude " . For the money it provides a lot . |
#14
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Battery question
On Saturday, June 20, 2020 at 11:43:06 AM UTC-7, Delta8 wrote:
I would like to build a 5 volt system to run Kobo with Top Hat/GPS as well as power my I phone with ForeFlight and a Stratux receiver for ads-b in . I like the audio collision avoidance that ForeFlight provides . Currently using power banks but during long flights changing batteries is a pain . I don't have Flarm yet but planning on in the future. I have a 14v SLA battery for everything else. Am I better of searching for a larger power bank ? Biggest I've seen is 70,000 mAh . I've seen ways to convert 12v to 5 but they seem like they will drain battery life of the 12v . Sorry for what may be a simple question with an obvious answer. -- Delta8 I use a couple of these battery buddies pluged into a rig runner. links below. works great! you can also get a usb splitter to run two usb devices off one battery buddy https://powerwerx.com/usbbuddy-power...device-charger https://powerwerx.com/west-mountain-...05h-horizontal |
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