|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

01-19-2020, 09:06 AM
|
 |
|
|
Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,643
|
|
Quote:
Originally Posted by bjdecker
I assume you're referring to this note for P-Mag?
"OPERATING NOTES: Battery Chargers: Some styles of ground (110 volt) chargers will hammer the battery with charge pulses as part of their normal cycle. Such hammering is not a typical buss state and can cause problems for the ignition if it is powered ON during such a charge. So as a normal guideline, KEEP IGNITIONS POWERED OFF WHILE (GROUND) CHARGING."
|
Yep, exactly ...
__________________
RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
|

01-19-2020, 09:10 AM
|
 |
|
|
Join Date: Jan 2005
Posts: 4,285
|
|
We are starting 360 CU-IN engines with tiny batteries (compared to your car).
Modern small light PM starters require large in-rush current vs wire wound.
Put 2 amp charger on it for 15-30 minutes wake battery up while you pre-flight.
Modern chargers will give you battery voltage and % charger.
Cold engine, cold battery, sitting for about 2.5 weeks sounds normal.
I'll never say anything critical about EarthX because triggers fans. 
__________________
George
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767
2020 Dues Paid
Last edited by gmcjetpilot : 01-19-2020 at 09:13 AM.
|

01-19-2020, 09:31 AM
|
 |
|
|
Join Date: Mar 2018
Location: Cornelia, GA
Posts: 51
|
|
SureFly ignition drain
Anyone know what the standby drain is for a SureFly mag ?
__________________
Dave McKinnon
KAJR - Cornelia, GA
1975 Cardinal RG N1593H since Mar 1993
1980 RV-3 N3VR Bought flying Sept 2017
Dues current 2020
|

01-19-2020, 10:00 AM
|
|
|
|
Join Date: May 2005
Location: Boston, MA
Posts: 452
|
|
Quote:
Originally Posted by bkervaski
Just as a data point, EarthX is a LifePO4 (not on that chart).
LiFePO4 is also very resistant to self-discharge. Remember the old days when your NiCad batteries would go dead in a month or so just sitting on the shelf? That?s because they self discharge at rate of about 1% per day. LiFePO4 has a typical self discharge rate of 5% per month. In other words, it takes six months for a LiFePO4 battery to self discharge to the same level a conventional battery reaches in just thirty days.
|
I believe you are correct that LiPo batteries have higher self-discharge rates when compared to LiFePO4 chemistry. It would be good to see the data and how susceptible each is to temperature. I think they both suffer higher rates in the first 24 hours.
__________________
Brian J.
Boston, MA
RV8 Based at ORH - Purchased
RV8 - The Project #83313 - Under Construction
|

01-19-2020, 10:29 AM
|
|
|
|
Join Date: Dec 2010
Location: Vacaville, CA
Posts: 167
|
|
Cold
I don?t have one of these batteries but my understanding is that they work much better at higher temperatures. You might need to put a load on it for a few minutes (turn on the master switch) while doing your preflight. This will warm up the battery.
-Andy
__________________
Andy Simpkinson
RV-9a Subaru engine.
|

01-19-2020, 10:54 AM
|
|
|
|
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,558
|
|
I don?t remember the SureFly power drain, but was told it is very low - a few milliamps (hardwired to the battery with an inline fuse). However, after reading these posts, I?m wondering if anything bad is happening while the charger is connected. I wired mine according to the installation manual, but I?m considering putting a switch in that circuit.
__________________
SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020
|

01-19-2020, 11:25 AM
|
|
|
|
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,558
|
|
SureFly ignition module draws less than 1 milliamp in standby mode. They recommend keeping a maintenance charger on the battery if the airplane is stored for one month or more. Apparently the charger doesn?t hurt anything in this case.
__________________
SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020
|

01-19-2020, 12:28 PM
|
|
|
|
Join Date: Jan 2005
Posts: 210
|
|
A data point on LiFePho4 cells
About 6.5 years ago, I bought a set of LiFePho4 cells to fix/upgrade an electric scooter of mine. Life happened and I didn't get back to the project or even look at the cells until last month. I tested the cells and found that they had all retained about 50% of nominal capacity. I'm not even sure they were shipped with a full charge. After cycling them, I found that they are delivering essentially 100% of rated capacity.
YMMV
__________________
Kevin Cameron - Fresno, CA - E79
N493DB RV4 Flying IO-360-A1B, 10:1, Straight-Bore cylinders, Gapless Piston Rings, Hartzell CS Prop,
AFS3400-EE, TruTrac DFII VS, Aera 660, GTX 335, GDL 52R,
XM Radio, SL30, SL40, PMA9000EX, MicroTrac 300 APRS
Last edited by kcameron : 01-19-2020 at 12:31 PM.
Reason: grammar
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 03:01 AM.
|