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Powering A Mikrotik HAP

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Tue, 10/24/2023 - 11:13
#1
n4tna
n4tna's picture
Powering A Mikrotik HAP
I'm putting together a new go kit with a Mikrotik HAP AC Lite and was wondering what you guy's recommended for an RF quiet 12-24v step up converter. I've looked at a lot of older posts and most of the links are no longer valid.
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Tue, 10/24/2023 - 13:22
AB7PA
From the Mikrotik hAP ac lite

From the Mikrotik hAP ac lite datasheet, you can power the device using Passive PoE via port 1 in a range of between 10v - 28v.  You should be able to eliminate any voltage fiddling and just power it from a 12v battery in the field.
 

Powering

Details
Number of DC inputs 2 (DC jack, PoE-IN)
DC jack input Voltage 10-28 V
Max power consumption 20 W
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Tue, 10/24/2023 - 16:24
(Reply to #2)
n4tna
n4tna's picture
Good to know. That's what I
Good to know. That's what I did with my older Ubiquiti gear. I've just read a few threads where people were having problems with the HAP when feeding it less than 24v.
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Tue, 10/24/2023 - 13:31
K6CCC
K6CCC's picture
You can power it from either
You can power it from either the DC in jack or passive POE via port 1.  In either case, it will work find on a 12 volt battery system.  Note that if you are going to power some other device  via the port 5 POE output, that device may require a higher voltage (especially considering voltage drop in the cable between the hAP and the other device).
 
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Tue, 10/24/2023 - 15:01
K7EOK
This is what we use ...

This is what we use ...

https://www.amazon.com/Voltage-Converter-Transformer-Waterproof-Vehicle/dp/B08YYB5N9S/ref=sr_1_14?crid=1SGY47J25LJ8B&keywords=9-20v%2Bto%2B24v&qid=1697924174&sprefix=9-20v%2Bto%2B24v%2Caps%2C240&sr=8-14&th=1

https://www.amazon.com/DROK-090183-Waterproof-Synchronous-Converter/dp/B00JUHEJJ2/ref=sr_1_4?crid=1SGY47J25LJ8B&keywords=9-20v+to+24v&qid=1697924234&sprefix=9-20v+to+24v%2Caps%2C240&sr=8-4

 

There are no perfectly quiet rf things in the world anymore ... just don't expect HF rigs to coexist near any power supplies or power adapters.

Ed
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Tue, 10/24/2023 - 16:28
(Reply to #5)
n4tna
n4tna's picture
Thanks I'll add them to my
Thanks I'll add them to my wishlist. I guess I'll try just powering it with the battery I'm going to use. I was able to find a part number for a Samlex converter that claims to be RF quiet, but it's almost $400 and nobody has them in stock that I could find.
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Wed, 10/25/2023 - 03:24
(Reply to #6)
AJ6GZ
2nd one...
I've used those "DROK" metal ones (various sizes) in several installations without issue. Haven't noticed any RFI. Many other things around here put out far more RFI than that!
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Tue, 10/24/2023 - 16:51
k1ky
k1ky's picture
Use 2 batteries

If you are intent on running from battery, then just simply use 2 batteries in series and maybe a dropping diode or 2 as needed if you are running a charger to keep the voltage (max 28v)  input to the HAP..  Double the voltage, double the fun!

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Wed, 10/25/2023 - 00:17
(Reply to #8)
n4tna
n4tna's picture
The idea behind this kit is
The idea behind this kit is for everything to fit into a 6u rack case and have mesh HF and VHF/UHF Winlink RMS server and web host computer all built in. So space is at a premium.I may end up powering from an external source but I do have room for a small 12ah SLA battery I have on hand but not quite room for two.
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Wed, 10/25/2023 - 02:07
(Reply to #9)
k1ky
k1ky's picture
Maybe 2 Smaller 12v batteries
I have seen some smaller 12v SLA batteries out there that are about 1/2 the thickness of the 12AH SLA's. Otherwise a 12-24 low noise step up converter would be the way to go.  What are you powering your VHF/IHF WINLINK RMS equipment with?
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Wed, 10/25/2023 - 09:43
(Reply to #10)
K7EOK
Re the VHF/UHF ...
Re the VHF/UHF ... immediately Tx is a huge power draw compared to AREDN.  I'd immediately go to Lithium only as short bursts of power are higher on a good LI battery than SLA.  If it all has to fit inside a go kit there are some awesome LI battery packs that also function as a DC only UPS.  But once the Tx power needs of the other tranciever are involved I'd put the power source in another box.

If you look at the DROK or other pages, there is an awesome simlar voltage converter that takes variable voltage in and puts out 13.8V ... which would make the other equipment (assuming it's a mobile rig) very happy.  I use this when powering my mobile dual band from the car battery so it doesn't get starved for voltage when the motor is off.

Ed
 
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Wed, 10/25/2023 - 14:42
(Reply to #11)
n4tna
n4tna's picture
Very interesting, I'll check
Very interesting, I'll check that out. I do plan to upgrade the sla battery to lipo4 but this is what I have now just to get it up and running. I'm sure other things will come up once I use it a time or two that I'll need to change.
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Wed, 10/25/2023 - 14:38
(Reply to #12)
n4tna
n4tna's picture
The VHF/UHF and HF radios
The VHF/UHF and HF radios will be powered by a small inverter generator. While the generator is running it will charge the 12ah battery. My thoughts was to run the HAP and the small 12v powered computer on the 12ah battery so the network stays up and running during refueling of the generator.
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Wed, 10/25/2023 - 03:29
(Reply to #13)
AJ6GZ
12V
Speaking of diode drops, there is a 0.6V drop on Port 5 of the hAP. Seriously, don't bother with 12V unless the hAP is the only thing in use.
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