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recapen(at)earthlink.net
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 Posted: Sun Jan 31, 2016 9:26 am Post subject: New EarthX battery |
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Takes up less space, weighs a lot less and spins the engine like crazy!
Even though I had an Odyssey PC680 previously, I went with the EarthX ETX900.
Here’s my question…:
First startup with the new battery was fine – engine came to life immediately.
My usual process is to bring the backup alternator (20 amp vacuum pad mounted) on line first – then the primary.
The backup alternator did not come on line – the primary did when I selected it.
Is it possible that the new battery tried to take so much power to recharge after the start sequence that is shredded the coupling?
I haven’t pulled it yet so I don’t know if that was the failure mode.
If so, I might need to change my pre-launch checklist….
Thanks,
Ralph Capen
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rnewman(at)tcwtech.com
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| Posted: Sun Jan 31, 2016 10:59 am Post subject: New EarthX battery |
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There actually may be nothing wrong at all. Depending on the voltage regulator set point on your backup alternator it may not put out any current at all because it sees the battery voltage as already to high. The earthX battery is a lithium iron type battery which will have a terminal voltage of about 13 volts under load. Rather than about 12 for pb-acid. Your back up alternator may not kick in and start providing charging current until it sees about 12.6 volts or so. If you were to leave the system on the backup alternator only and turned on a bunch of loads to draw down the new battery I think you'll see your backup alternator come on line. This is exactly the scenario I saw when I changed over to using Li-fe batteries for my RV-10.
Bob NewmanTCW Technologies, LLC
610-928-3420
On Jan 31, 2016, at 12:24 PM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
| Quote: | <![endif]--> <![endif]-->
Takes up less space, weighs a lot less and spins the engine like crazy!
Even though I had an Odyssey PC680 previously, I went with the EarthX ETX900.
Here’s my question…:
First startup with the new battery was fine – engine came to life immediately.
My usual process is to bring the backup alternator (20 amp vacuum pad mounted) on line first – then the primary.
The backup alternator did not come on line – the primary did when I selected it.
Is it possible that the new battery tried to take so much power to recharge after the start sequence that is shredded the coupling?
I haven’t pulled it yet so I don’t know if that was the failure mode.
If so, I might need to change my pre-launch checklist….
Thanks,
Ralph Capen
|
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nuckolls.bob(at)aeroelect
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| Posted: Sun Jan 31, 2016 12:17 pm Post subject: New EarthX battery |
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At 11:24 AM 1/31/2016, you wrote:
| Quote: | Takes up less space, weighs a lot less and spins the engine like crazy!
Even though I had an Odyssey PC680 previously, I went with the EarthX ETX900.
Here’s my question…:
First startup with the new battery was fine – engine came to life immediately.
My usual process is to bring the backup alternator (20 amp vacuum pad mounted) on line first – then the primary.
The backup alternator did not come on line – the primary did when I selected it.
Is it possible that the new battery tried to take so much power to recharge after the start sequence that is shredded the coupling?
I haven’t pulled it yet so I don’t know if that was the failure mode. |
What is the setpoint voltage on your standby
alternator? It may be that it's set LOWER
than the voltage delivered by the LiFePo
battery . . . so it 'thinks' everything is
okay and doesn't fails to get the alternator
out of bed.
The higher and flatter discharge curve of
the LiFePo battery may call for an adjustment
of the setup on the stand-by regulators.
I think we used to set those at 13.0 . . .
certainly it needs to be HIGHER than the
battery's delivery voltage . . . the whole
idea behind the standby system is to hold
all of the battery energy in reserve for
approach to landing.
The LiFePo cells just barely begin to accept
a charge at 3.3 volts per cell but will achieve
full charge at 3.4 volts per cell. 4 x 3.4 is
13.6 volts so I think I would set the standby
altenator at 13.8 and the main alternator at
14.2v
Bob . . .
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recapen(at)earthlink.net
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| Posted: Sun Jan 31, 2016 2:05 pm Post subject: New EarthX battery |
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Excellent! I'll check both and adjust accordingly.
Sent from my Verizon Wireless 4G LTE smartphone
-------- Original message --------
From: "Robert L. Nuckolls, III"
Date:01/31/2016 15:13 (GMT-05:00)
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: New EarthX battery
At 11:24 AM 1/31/2016, you wrote:
| Quote: | Takes up less space, weighs a lot less and spins the engine like crazy!
Even though I had an Odyssey PC680 previously, I went with the EarthX ETX900.
HereÂ’s my questionÂ…:
First startup with the new battery was fine – engine came to life immediately.
My usual process is to bring the backup alternator (20 amp vacuum pad mounted) on line first – then the primary.
The backup alternator did not come on line – the primary did when I selected it.
Is it possible that the new battery tried to take so much power to recharge after the start sequence that is shredded the coupling?
I havenÂ’t pulled it yet so I donÂ’t know if that was the failure mode. |
What is the setpoint voltage on your standby
alternator? It may be that it's set LOWER
than the voltage delivered by the LiFePo
battery . . . so it 'thinks' everything is
okay and doesn't fails to get the alternator
out of bed.
The higher and flatter discharge curve of
the LiFePo battery may call for an adjustment
of the setup on the stand-by regulators.
I think we used to set those at 13.0 . . .
certainly it needs to be HIGHER than the
battery's delivery voltage . . . the whole
idea behind the standby system is to hold
all of the battery energy in reserve for
approach to landing.
The LiFePo cells just barely begin to accept
a charge at 3.3 volts per cell but will achieve
full charge at 3.4 volts per cell. 4 x 3.4 is
13.6 volts so I think I would set the standby
altenator at 13.8 and the main alternator at
14.2v
Bob . . .
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recapen(at)earthlink.net
Guest
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| Posted: Sun Jan 31, 2016 2:05 pm Post subject: New EarthX battery |
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Thanks guess I didn't have enough load online. I'll also be looking at the regulator set points.
Sent from my Verizon Wireless 4G LTE smartphone
-------- Original message --------
From: Tcwtech
Date:01/31/2016 13:56 (GMT-05:00)
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: New EarthX battery
There actually may be nothing wrong at all. Depending on the voltage regulator set point on your backup alternator it may not put out any current at all because it sees the battery voltage as already to high. The earthX battery is a lithium iron type battery which will have a terminal voltage of about 13 volts under load. Rather than about 12 for pb-acid. Your back up alternator may not kick in and start providing charging current until it sees about 12.6 volts or so. If you were to leave the system on the backup alternator only and turned on a bunch of loads to draw down the new battery I think you'll see your backup alternator come on line. This is exactly the scenario I saw when I changed over to using Li-fe batteries for my RV-10.
Bob NewmanTCW Technologies, LLC
610-928-3420
On Jan 31, 2016, at 12:24 PM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
| Quote: | <![endif]--> <![endif]-->
Takes up less space, weighs a lot less and spins the engine like crazy!
Even though I had an Odyssey PC680 previously, I went with the EarthX ETX900.
Here’s my question…:
First startup with the new battery was fine – engine came to life immediately.
My usual process is to bring the backup alternator (20 amp vacuum pad mounted) on line first – then the primary.
The backup alternator did not come on line – the primary did when I selected it.
Is it possible that the new battery tried to take so much power to recharge after the start sequence that is shredded the coupling?
I haven’t pulled it yet so I don’t know if that was the failure mode.
If so, I might need to change my pre-launch checklist….
Thanks,
Ralph Capen
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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recapen(at)earthlink.net
Guest
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| Posted: Sun Feb 07, 2016 1:43 pm Post subject: New EarthX battery |
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I threw one full turn to the adjuster on the backup regulator – that did the trick to get it started.
Next I’ll measure the voltage at the battery while things are running so I can optimize it as indicated below.
I had installed them without checking or adjusting them for the original PC680 – my AFS3400 showed the voltage at 13.8 with the usual stuff running….
Thanks!
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Sunday, January 31, 2016 3:14 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: New EarthX battery
At 11:24 AM 1/31/2016, you wrote:
| Quote: |
Takes up less space, weighs a lot less and spins the engine like crazy!
Even though I had an Odyssey PC680 previously, I went with the EarthX ETX900.
Here’s my question…:
First startup with the new battery was fine – engine came to life immediately.
My usual process is to bring the backup alternator (20 amp vacuum pad mounted) on line first – then the primary.
The backup alternator did not come on line – the primary did when I selected it.
Is it possible that the new battery tried to take so much power to recharge after the start sequence that is shredded the coupling?
I haven’t pulled it yet so I don’t know if that was the failure mode. |
What is the setpoint voltage on your standby
alternator? It may be that it's set LOWER
than the voltage delivered by the LiFePo
battery . . . so it 'thinks' everything is
okay and doesn't fails to get the alternator
out of bed.
The higher and flatter discharge curve of
the LiFePo battery may call for an adjustment
of the setup on the stand-by regulators.
I think we used to set those at 13.0 . . .
certainly it needs to be HIGHER than the
battery's delivery voltage . . . the whole
idea behind the standby system is to hold
all of the battery energy in reserve for
approach to landing.
The LiFePo cells just barely begin to accept
a charge at 3.3 volts per cell but will achieve
full charge at 3.4 volts per cell. 4 x 3.4 is
13.6 volts so I think I would set the standby
altenator at 13.8 and the main alternator at
14.2v
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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