Today's Message Index:
----------------------
1. 05:28 AM - ov warning light (bobnoffs)
2. 05:17 PM - Re: ov warning light (Robert L. Nuckolls, III)
3. 07:35 PM - Re: ov warning light (bob noffs)
4. 07:46 PM - Re: ov warning light (Charlie England)
Message 1
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| Subject: | ov warning light |
hi all,
i put together an ov'crowbar ' for the output side of my alternator but in the
end i didn't use it. instead i made a warning light from a 2.2v 20ma. led, 3
resistors totaling 1700 ohms and a 13v zenor diode. at 14v it very faintly glows
which is good to see that it is working. at 15.06 v it glows brightly. not
much difference between 10ma. and 20ma. in brightness so i have some leeway
up to 30 volts. this warning is to protect 2 earthx batteries. whether or not
i need it is a question but i gotta do something with that hole in the panel.
bob noffs
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488374#488374
Message 2
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| Subject: | Re: ov warning light |
At 07:27 AM 3/31/2019, you wrote:
>
>hi all,
> i put together an ov'crowbar ' for the output side of my
> alternator but in the end i didn't use it. instead i made a warning
> light from a 2.2v 20ma. led, 3 resistors totaling 1700 ohms and a
> 13v zenor diode. at 14v it very faintly glows which is good to see
> that it is working. at 15.06 v it glows brightly. not much
> difference between 10ma. and 20ma. in brightness so i have
> some leeway up to 30 volts. this warning is to protect 2 earthx
> batteries. whether or not i need it is a question but i gotta do
> something with that hole in the panel.
EarthX battery BMS will protect the
batteries. The BMS will not protect
your avionics. If the BMS DISCONNECTS
the battery from a runaway alternator,
the bus voltage climbs at a VERY rapid
rate.
Unless your ov warning is BRIGHT, SUNLIGHT
VIEWABLE, and FLASHES to trigger your
Japanese kick boxer-reflexes . . . chances
for making lots of transistor-toast is
significant . . . but the batteries
will be fine.
Bob . . .
Message 3
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| Subject: | Re: ov warning light |
hi bob,
yea, i know. and all i am doing it for is the batteries. after asking a
lot of questions about this over several months it seems hardly anyone is
doing anything to protect transistors.
bob noffs
On Sun, Mar 31, 2019 at 7:21 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 07:27 AM 3/31/2019, you wrote:
>
>
> hi all,
> i put together an ov'crowbar ' for the output side of my alternator but
> in the end i didn't use it. instead i made a warning light from a 2.2v
> 20ma. led, 3 resistors totaling 1700 ohms and a 13v zenor diode. at 14v it
> very faintly glows which is good to see that it is working. at 15.06 v it
> glows brightly. not much difference between 10ma. and 20ma. in brightness
> so i have some leeway up to 30 volts. this warning is to protect 2 earthx
> batteries. whether or not i need it is a question but i gotta do something
> with that hole in the panel.
>
>
> EarthX battery BMS will protect the
> batteries. The BMS will not protect
> your avionics. If the BMS DISCONNECTS
> the battery from a runaway alternator,
> the bus voltage climbs at a VERY rapid
> rate.
>
> Unless your ov warning is BRIGHT, SUNLIGHT
> VIEWABLE, and FLASHES to trigger your
> Japanese kick boxer-reflexes . . . chances
> for making lots of transistor-toast is
> significant . . . but the batteries
> will be fine.
>
>
> Bob . . .
>
Message 4
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| Subject: | Re: ov warning light |
Hi Bob,
Who are you asking? :-)
Charlie
On 3/31/2019 9:33 PM, bob noffs wrote:
> hi bob,
> yea, i know. and all i am doing it for is the batteries. after asking
> a lot of questions about this over several months it seems hardly
> anyone is doing anything to protect transistors.
> bob noffs
>
> On Sun, Mar 31, 2019 at 7:21 PM Robert L. Nuckolls, III
> <nuckolls.bob@aeroelectric.com <mailto:nuckolls.bob@aeroelectric.com>>
> wrote:
>
> At 07:27 AM 3/31/2019, you wrote:
>> <icubob@gmail.com <mailto:icubob@gmail.com>>
>>
>> hi all,
>> i put together an ov'crowbar ' for the output side of my
>> alternator but in the end i didn't use it. instead i made a
>> warning light from a 2.2v 20ma. led, 3 resistors totaling 1700
>> ohms and a 13v zenor diode. at 14v it very faintly glows which is
>> good to see that it is working. at 15.06 v it glows brightly. not
>> much difference between 10ma. and 20ma. in brightness so i have
>> some leeway up to 30 volts. this warning is to protect 2 earthx
>> batteries. whether or not i need it is a question but i gotta do
>> something with that hole in the panel.
>
> EarthX battery BMS will protect the
> batteries. The BMS will not protect
> your avionics. If the BMS DISCONNECTS
> the battery from a runaway alternator,
> the bus voltage climbs at a VERY rapid
> rate.
>
> Unless your ov warning is BRIGHT, SUNLIGHT
> VIEWABLE, and FLASHES to trigger your
> Japanese kick boxer-reflexes . . . chances
> for making lots of transistor-toast is
> significant . . . but the batteries
> will be fine.
>
>
> Bob . . .
>
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