Looking for Accessory Power port fuse

[Charles]

I figured that at $3.49, it was worth a try given that the real aviation grade equivalent sells for $149.95 ( http://www.lonestaraviation.com/Power-A ... ocket.html ).

If it doesn't work, I'll have a nice enclosure with which to build my own using something like this: http://instrumentation.obs.carnegiescie ... s/SMSA.pdf.

[Rick]

About the Aux Power Port. The 2004 and 2005 DA40's I flew both had 24v ports. My current 2007 has a 12v port. I don't know if the 12v port is an option, or if Diamond changed the design so that all DA40's after some year have 12v, but either way they should be clearly marked.

With the 24v ports, there is a single glass slo-blo fuse on the firewall under the engine cowling. For the 12v ports, there is a DC converter to step the 24v down to 12v, and the little Pico fuse on the back of the socket. Both arrangements exist out there, which I guess is why this thread is a bit confusing.

Too bad about the pyrotechnic display with the USB charger - that looked like a good option for charging iStuff from the 24v ports. Hopefully one of the other units will prove more durable!

[krellis]

[quote="Cschobel"]I thought the power outlet in the DA40 was 24 volts?

The battery is 24 volts, but the alternator puts out approximately 28 volts. In a 12 volt system, a fully charged battery is a little over 12 volts and most alternators put out 14.8 +- volts. If the charging voltage was not higher than the battery voltage, the battery would never charge. You can verify this by looking at the bus voltage before and after start (assuming the alternator switch is on).

Krea Ellis
DA-40XLS

[Rick]

I thought the power outlet in the DA40 was 24 volts?

The battery is 24 volts, but the alternator puts out approximately 28 volts. In a 12 volt system, a fully charged battery is a little over 12 volts and most alternators put out 14.8 +- volts. If the charging voltage was not higher than the battery voltage, the battery would never charge. You can verify this by looking at the bus voltage before and after start (assuming the alternator switch is on).

You can see this in the data log files - you should see 24 volts at power on, until you start the engine. During start, you will notice the voltage drop a little bit as the starter pulls lots of current from the battery, and then it should jump to 28 volts when the alternator kicks in, until you shut down again.

And just to be perfectly clear, the "12 volt systems" Keith is talking about would be things like your car, etc. - NOT the DA40's with 12 volt aux ports. All DA40's have 24 volt systems - some of them use a DC Converter to send 12 volts to the aux port.

[Keith M]

All DA40's have 24 volt systems

Except for those with Thielert engines. They have a 12V battery and 14V alternator - probably because that's standard for car engines. However, Austro engines use a 24V system.

[Rick]

All DA40's have 24 volt systems

Except for those with Thielert engines. They have a 12V battery and 14V alternator - probably because that's standard for car engines. However, Austro engines use a 24V system.

Yikes - I forgot there were DA40's without Lycomings! I can be narrow-minded sometimes, just ask my wife! :-D

[carym]

All DA40's have 24 volt systems

Except for those with Thielert engines. They have a 12V battery and 14V alternator - probably because that's standard for car engines. However, Austro engines use a 24V system.

I know this is a DA40 forum, but just to make sure that everyone remains confused the Thielert powerd DA42 is a 24 volt system (and an accessory power port is not a standard option on the airplane).

[Gasser]

Just an update on the orange powerlet I bought. They gave me a full refund and corrected the specs on their website and an the manufactures webste. They had no other solutions for us a this time.

Racer wholesale customer service was top notch!

Jeff.

[Gasser]

I figured that at $3.49, it was worth a try given that the real aviation grade equivalent sells for $149.95 ( http://www.lonestaraviation.com/Power-A ... ocket.html ).

If it doesn't work, I'll have a nice enclosure with which to build my own using something like this: http://instrumentation.obs.carnegiescie ... s/SMSA.pdf.

Actually the 149 dollar one comes with a TSOd socket which we don't need. They sell just the converter alone for. $ 49.00. I may just go with this and be done. It shows on its spec sheet it's rated for 14/28v. Although written on the plug says 24v.

Waiting on your pirep on the $5 one.

We will see.

Jeff.

[bcocheran]

A 3 amp fuse will not charge an iPad will it? Doesn't an iPad take 10 amps to charge?