Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
Search
integrated battery for QCX
|
All,
I have 20m and 40m versions coming - Order #184 (yes I set my alarm early). ?I'm planning on building them into a case with an integrated LiPo battery. ?I've never designed a solution like this, but I know there are many inexpensive charger / regulator boards that could be used with a small battery. ?My goal is to stay small but have enough power to operate at least 4 hours on a charge. ?What would be a good size battery and charge controller to integrate? Would be good if the radio could run off the power supply / charger line while charging, and even better if it could charge from a solar panel. ? 72 de AC3K |
||
开云体育Hello Patrick.?
I've been running my third experimental U3S off one of those USB charger units used for charging a phone.?
It can run for several days depending on ma capacity.?
I acquired several recently second hand and they are proving to be very useful.?
Not sure I could charge one from a solar cell though but in saying that, I've never tried.?
They make some compact units now at affordable prices.?
All I've done is to butcher a USB lead and soldered it directly to the U3S. That way when one goes flat, I can just grab another unit and plug it in.?
Kindest. James.?
|
||
|
That's a good idea. ? I have a power pack of three 18650s that I built into an Altoids tin to power my HB-1A, but I have to remove the cells and put them in a separate charger to charge them up.? I'd like to actually find a solution I can build into a single case along with the radio, and charge just by plugging a power supply (or charger) into the radio.? Have a look at W4KRL's Weather Station kit - (By the way, I can't recommend this kit enough - it is a weather station that runs off a solar panel and uses a wifi-enabled ESP8266 Arduino clone to phone the data in).? Karl's kit uses a small charge controller that can charge off a 5V mini-USB charger or from a solar panel, and keeps a 3.7 volt LiPo cell charged. ? Of course that's not enough juice for the QCX.? But I like how it's all integrated. 72 de AC3K |
||
|
Running a 3S LiPo/LiIo in a pack you need a BMS to balance and protect the cells from over/undervoltage. These are widely available on ebay, search for "18650 3s bms" or similar. For charging you need a CCCV power source, and they're also abundant on ebay, search "ac charger 3s 18650", make sure they have constant current mode and not just foldback limiting. These chargers will also work when powering the unit, but the charge complete led will probably not work until you shut it down. Make sure to match the correct end voltage, LiIo 18650 is usually 4.1V and LiPo pouch cells can handle 4.2V. Of course you can run them without all this, but YMMV. One mistake
and they're either scrap or on fire. The Li+ are very powerful and packs a
lot of energy compared to lead acid cells, so very pleasant to have in
portable stuff. Good luck with the build |
||
|
Vernon Matheson
开云体育Sent?from?my?BlackBerry?10?smartphone?on?the?Rogers?network.
Running a 3S LiPo/LiIo in a pack you need a BMS to balance and protect the cells from over/undervoltage. These are widely available on ebay, search for "18650 3s bms" or similar. For charging you need a CCCV power source, and they're also abundant on ebay, search "ac charger 3s 18650", make sure they have constant current mode and not just foldback limiting. These chargers will also work when powering the unit, but the charge complete led will probably not work until you shut it down. Make sure to match the correct end voltage, LiIo 18650 is usually 4.1V and LiPo pouch cells can handle 4.2V. Of course you can run them without all this, but YMMV. One mistake
and they're either scrap or on fire. The Li+ are very powerful and packs a
lot of energy compared to lead acid cells, so very pleasant to have in
portable stuff. Good luck with the build |
||
开云体育Hi Patrick, I run 3 18650 lithium cells in series. The cells are wired to a controller built into the battery stack. This is used purely to shut down the stack if any cell voltage drops below 2.1 volts. The controller is re-enabled if all cell voltages are above 3V.I have a 4 or 5 pin din socket mounted on the case, connected to each cell positive, and to the most negative point.? I charge the 3 cells from a bank of usb charger boards.? Each board is fed from a mains to +5v @1 Amp output isolated supply.? Thus all cells are charged at the same time to the voltage set by the charger board(4.1V), and as the cells are individually charged, no balancing is required, and the cells are charged in typically 3.5 hours. I stress that the outputs of the Mains PSU (?1.80-ebay) and the inputs and outputs of the USB chargers (?0.89-ebay) are isolated from each other and floating. They are connected together at the charging plug/socket.? A better design would be to use a single mains supply with 3 isolated outputs. I can achieve > 7W on 7.0 MHz into a resistive load with 16.6V supply ( 4xlipo cells), But I let the magic smoke out of the BS170 when I had a badly mismatched load.? I get 4.9w at 7.0MHz, 5.05W at 7.8MHz. I suspect the LPF requires minor tweeking, but I haven't bothered. This is at 13.8V Regards Vin? G4ksy On 06/09/17 14:52, Patrick Sullivan
wrote:
All, |
||
Daniel Ekman SA2KNG
to navigate to use esc to dismiss