Today's Message Index:
----------------------
1. 06:12 AM - ULPower electrical system (N43YX)
2. 12:50 PM - Re: ULPower electrical system (user9253)
3. 01:54 PM - Re: ULPower electrical system (Art Zemon)
4. 05:00 PM - Re: ULPower electrical system (user9253)
5. 05:14 PM - Re: ULPower electrical system (N43YX)
6. 08:01 PM - Re: ULPower electrical system (user9253)
7. 08:25 PM - Re: Re: ULPower electrical system (Charlie England)
Message 1
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| Subject: | ULPower electrical system |
I'm working on an electrical design for a Waiex-B with a UL Power 350iS. I've
started with Z21 but I think it may require some modification. I'm going with
a single ECU and probably the 50A alternator upgrade (the ECU and fuel pump use
15A so the stock 30A alternator wouldn't leave a ton left for my electrical
loads). The installation manual linked below seems lacking on the electrical
system in several respects.
1) There is no OV protection
2) There is no way---CB or switch--to disconnect the alternator
I'd like to use the B&C over voltage kit, but I doubt if that is possible with
the larger alternator. At a minimum, I'd like to be able to manually disconnect
the alternator.
Could someone give me some guidance and suggestions?
https://ulpower.com/content/1-engines/5-manuals/installation-checklist-v2.2.pdf
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507828#507828
Message 2
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| Subject: | Re: ULPower electrical system |
The UL Power electrical installation is explained in this manual:
https://ulpower.com/content/1-engines/5-manuals/installation-manual-2022-v1.5.pdf
If overvoltage protection is desired, use Z-16 as a guide. In fact, Z-16 also
shows how to disconnect the alternator using a relay.
Since the UL Power engine appears to have a 3 phase alternator, I recommend using
3 automotive relays, one for each phase.
Using a 3 phase contactor is a more elegant way of controlling the alternator,
but automotive relays have the advantage of low price and availability.
The UL Power manual warns that the regulator (30amp only?) will be destroyed if
it is disconnected from the battery. There is no danger to the regulator if
the AC is disconnected.
Best practice is to not switch the charging system on or off while the engine is
running.
The 10awg wire recommended for the 68 000 F capacitor seems big.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507829#507829
Message 3
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| Subject: | Re: ULPower electrical system |
Why are you sizing your alternator for 50A? It is more typical to size the
alternator for the maximum continuous load and I really wonder whether a
Waiex needs 50 amps. For example, in my airplane, the autopilot servos have
a max draw of 3.4 amp but a typical draw of only 1.8. Similarly, my comm
radio has a max draw of 3.0 amps but a typical draw of only 0.5 and the 10
inch EFIS screen has a max draw of 2.25 but a typical draw of only 1.2.
When I did a spreadsheet of max and typical draws for all devices, I came
up with 29.28 max and 18.57 typical. You can see what I did in this overview
<https://drive.google.com/file/d/0BzOP2gb9_3RQSU5qbVN1ckJNOUk/view?usp=sharing&resourcekey=0-YapZTgVYzSB8u9pNhnui4g>
drawing for my wiring system documentation.
-- Art Z.
On Mon, Sep 5, 2022 at 8:23 AM N43YX <awgaut@gmail.com> wrote:
>
> I'm working on an electrical design for a Waiex-B with a UL Power 350iS.
> I've started with Z21 but I think it may require some modification. I'm
> going with a single ECU and probably the 50A alternator upgrade (the ECU
> and fuel pump use 15A so the stock 30A alternator wouldn't leave a ton left
> for my electrical loads). The installation manual linked below seems
> lacking on the electrical system in several respects.
>
> 1) There is no OV protection
>
> 2) There is no way---CB or switch--to disconnect the alternator
>
> I'd like to use the B&C over voltage kit, but I doubt if that is possible
> with the larger alternator. At a minimum, I'd like to be able to manually
> disconnect the alternator.
>
> Could someone give me some guidance and suggestions?
>
>
> https://ulpower.com/content/1-engines/5-manuals/installation-checklist-v2.2.pdf
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=507828#507828
>
>
--
My blog: CheerfulCurmudgeon.com
*Wisdom is knowing what to do next. Virtue is doing it. -- David Starr
Jordan*
Message 4
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| Subject: | Re: ULPower electrical system |
My RV-12 has a 20 amp alternator. The plane uses less than 10 amps.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507831#507831
Message 5
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| Subject: | Re: ULPower electrical system |
The ULPower engine is electrically dependent. It uses ~15 A at full throttle and
about 12.5 A at cruise power. So, that gets subtracted off the top. Here
is my list of electrical loads (first number is maximum; parenthetical numbers
are typical):
Engine 15 (13)
Battery contactor 0.8
SkyView 3.6 (2.6)
Intercom 0.1
AV-20S 0.5
iPad 0.4
Strobe lights 2
Seat Heater 10
Nav lights 0.6
Com 2 (0.2)
Xpnder 0.4
CO Monitor 0.1
ADS-B receiver 0.1
AP 3.3 (2)
Landing/taxi light 2.5
35.3 continuous
Flaps are an additional 5 A, but since it is a (very) intermittent load I didn't
include them. With traditional alternators, I have read that you should plan
on loading them at ~80% capacity. Not sure that this applies to PM alternators.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507832#507832
Message 6
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| Subject: | Re: ULPower electrical system |
The 10amp seat heater can be subtracted. It is not a continuous load, especially
in Tulsa OK.
If the alternator can not maintain the voltage, It won't hurt to let the battery
discharge for a few minutes while heating the seat.
Percentage of safe alternator load depends on its temperature. If kept cool, it
can even be operated at more than 100 percent.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507833#507833
Message 7
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| Subject: | Re: ULPower electrical system |
Not a safe assumption=2E=C2- Some use seat heat to replace cabin heat=2E
In those cases,=C2- load would be continuous,=C2- when it's needed=2E
=81=A3Get BlueMail for Android =8B
On Sep 5, 2022, 10:04 PM, at
10:04 PM, user9253 <fransew@gmail=2Ecom> wrote:
>--> AeroElectric-List mess
age posted by: "user9253" <fransew@gmail=2Ecom>
>
>The 10amp seat heater ca
n be subtracted=2E It is not a continuous load,
>especially in Tulsa OK=2E
>If the alternator can not maintain the voltage, It won't hurt to let
>the
battery discharge for a few minutes while heating the seat=2E
>Percentage
of safe alternator load depends on its temperature=2E If kept
>cool, it ca
n even be operated at more than 100 percent=2E
>
>--------
>Joe Gores
>
>
>
>Read this topic online here:
>
>http://forums=2Ematronics=2Ecom/viewtop
ic=2Ephp?p=507833#507833
>
>
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