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paul.zimmer00(at)gmail.co
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 Posted: Tue Jan 28, 2020 7:19 am Post subject: This doesn't seem right, but what do I know |
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I use and monitor two Hall effect current sensors on my RV. One measures the current flow on the "B" lead from the main alternator, and the other measures the current flow to/from the main battery.
What doesn't make sense to me is there are periodic and frequent current flows to/from the battery (1 to 5 amps) during normal cruise operations, this during periods of static and relatively light load (12-15 amps) on the electrical system, much smaller than the capacity of the 60A Plane Power alternator. I would expect all power to be supplied directly from the alternator as it is supplying the current at a higher voltage (~14.5v or so) than the battery. These periods of flow to/from the battery are short in duration normally lasting only a few seconds.
Is this normal and to be expected, or does it suggest a problem with the internally regulated alternator, or perhaps with the current sensor itself?
Any insight explaining what I am seeing will be appreciated.
Thanks
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paul.zimmer00(at)gmail.co
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| Posted: Tue Jan 28, 2020 8:49 am Post subject: This doesn't seem right, but what do I know |
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I can’t say that I’ve noticed a bus voltage drop during these times of battery outflow, but before I say one way or the other, I’ll need to pay a little closer attention, and perhaps record the engine monitor parameters during a flight which would allow for an after the fact thorough analysis of what actually went on. I’ll circle back at a later date. Thanks
On Tue, Jan 28, 2020 at 10:43 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | <snip>
| Quote: | These periods of flow to/from the battery are short
in duration normally lasting only a few seconds.
Is this normal and to be expected, or does it
suggest a problem with the internally regulated
alternator, or perhaps with the current sensor itself?
Any insight explaining what I am seeing will be appreciated. |
The battery's physics reacts to BUS VOLTAGE.
Any period battery energy outflow MUST be
paired with a drop in bus voltage to something
below the battery's present open-circuit
voltage.
The voltage doesn't have to drop to
the battery's natural delivery
level (~12.5 volts for SVLA) . . .
a battery across an operating bus
will support small outflow currents
at voltages higher than 12.5.
What is your normal bus voltage and do
you notice any depression of voltage
that corresponds to battery outflow
events?
Bob . . .
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ceengland7(at)gmail.com
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| Posted: Tue Jan 28, 2020 11:05 am Post subject: This doesn't seem right, but what do I know |
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If you were using a shunt, I'd suggest checking any fuseholders used to protect the sense wires. Any minor variations in resistance in the sense lines can cause significant instrument error, showing discharge.
Charlie
On 1/28/2020 10:46 AM, Paul Zimmer wrote:
| Quote: | I can’t say that I’ve noticed a bus voltage drop during these times of battery outflow, but before I say one way or the other, I’ll need to pay a little closer attention, and perhaps record the engine monitor parameters during a flight which would allow for an after the fact thorough analysis of what actually went on. I’ll circle back at a later date. Thanks
On Tue, Jan 28, 2020 at 10:43 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | <snip>
| Quote: | These periods of flow to/from the battery are short
in duration normally lasting only a few seconds.
Is this normal and to be expected, or does it
suggest a problem with the internally regulated
alternator, or perhaps with the current sensor itself?
Any insight explaining what I am seeing will be appreciated. |
The battery's physics reacts to BUS VOLTAGE.
Any period battery energy outflow MUST be
paired with a drop in bus voltage to something
below the battery's present open-circuit
voltage.
The voltage doesn't have to drop to
the battery's natural delivery
level (~12.5 volts for SVLA) . . .
a battery across an operating bus
will support small outflow currents
at voltages higher than 12.5.
What is your normal bus voltage and do
you notice any depression of voltage
that corresponds to battery outflow
events?
Bob . . .
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