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Hopefully if you ask your vendor, they can supply succinct information in this regard. |
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What brand battery is it, please. We?re starting to drag a GOOD battery company (EarthX) into the mud of false/uninformed assumptions. |
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You are correct. It looks like the 15.5v is for the non-aviation type battery for EarthX. reading the manual again (ETX_Manual_111017_X) ETX Hundred Series - BMS "In the event of a charging system failure where the voltage increases to above 15.5V, the resistance to charging current increases, and above 16V the charging current is completely blocked. The time delay for this feature is 2 second to allow the aircraft alternator?s over voltage protection (crowbar circuit) to activate first. This design offers charge voltage protection greater than 40V. The discharge current (current out of battery) is unaffected in this situation. EarthX requires having automatic over-voltage protection (crowbar) for alternator type charging systems (not required for <20 Amp pad mount standby alternators)." |
Not an EarthX
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Glad you are safe and sound after your incident here. We are currently at EAA Oshkosh so please forgive the brief response here but just to set the record straight here for everyone on the question to if this is an EarthX battery: this is not an EarthX battery. If you would like to review the documented BMS functions of the EarthX, please go to www.earthxbatteries.com. If your here at Oshkosh, please stop by and see us in Hangar C. We would love to meet you. |
Hi Kathy, hope you guys are having a great Airventure (now that it’s dried out a bit).
I’d like to commend EarthX on having some of the best documentation I’ve read as I investigate my situation. I’ve been reading the documentation of several vendors, comparing how each vendor’s battery technology might have dealt with it. Having it written down and published is more comforting (and quicker) than the sometimes protracted back-and-forth of e-mail support. If you fly with an EarthX battery or are considering it, RTFM. You will learn something. Their documentation clearly details how their battery technology works. EarthX also has a current advantage with its inclusion of a discrete output indicator. It’s level of information would have dramatically reduced my “head scratching”. This has been one of those “you don’t know what you don’t know” experiences. My backup system worked as designed ... and now I know more about battery management systems than I thought I’d ever care to. :) |
Glen,
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(My personal opinion is that EarthX has very good documentation. My battery does not.) The value of the discussion is to open up readers to a level of detail that may not have otherwise considered. (At least, that is what it has done for me.) |
It appears one of the moderators took it upon themselves to change the title of this thread to exclude EarthX.
I have no control over what moderators do on these forums. I will repeat two points:
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Precise explanation required.
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Like it will not accept 17 volts input but sends out 13 volt power on the same wires. |
This entire thread highlights the importance of having a regulator with crowbar protection like those offered by B&C Specialties. This will kill the alternator within a few milliseconds of an over-voltage event. Regardless of the BMS installed, the event will not likely even be noticed by the battery.
I have that, AND fully redundant, twin EarthX batteries, either of which can be selected as main via an On-Off-On master switch. That causes the other to be automatically isolated by and charged through a diode array. The diode array has an approximate .25V drop from main bus voltage. Even if the main battery were to shutdown prior to crowbar-activation, the “secondary” battery will not see the OV event before the crowbar shutdown. One ignition and the critical fuel pump are always operated off the secondary battery, so a distracting loss of power will not complicate the pilot’s reaction. ![]() The EarthX BMS includes a delayed response to OV events precisely for the purpose of allowing time for a crowbar shutdown. I for one applaud the moderator’s action in clarifying without doubt that the described failure did not involve an EarthX battery, but I think any such change in a post or post topic should be clearly identified by the moderator when they make it.- Otis |
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