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Stator output.

  • rogerl1961
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1 week 4 days ago #21484 by rogerl1961
Stator output. was created by rogerl1961
So I tested the rectifier by the two yellow wires and the ohms measurements all seemed fine. Then I checked the AC Output and found 14.5 AC volts at 2000 rmp and than at 4000 RPM it was 20 volts. My lithium battery when started was 13.4 volts without anything on and without the engine running. When I checked the voltage at the battery after it ran for about 5 minutes it showed 13.3 volts.

So i am wondering if a lithium battery doesn't want to charge right with the rotax 912uls rectfie? Is it possible that when the input voltage coming out of the EarthX lifepo4 battery is 13.4 volts that the rectifier sees that high of voltage and doesn't kick out the proper charging voltage.

What voltage does a rotax stock stator/rectifier put out to a normal fully charged 12 volt lead acid battery?

What battery is recommended for this type of engine?

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1 week 4 days ago #21486 by Bill Hertzel
Replied by Bill Hertzel on topic Stator output.
The nominal output of the charging system should be in the lower 14-volt range.
This assumes the engine is in a cruise rpm range. (4000-5500rpm)
When you start the engine you partially deplete the battery.
If the next 5 minutes were spent idling below 3000 rpm, the generators minimal output was used powering the panel loads and very little went to recharge the battery.

See the chart in the Installation Manual in section 24-00-00, page 8.

Monitor the Battery Voltage and Current while the engine is running and note how it varies with RPM.
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1 week 3 days ago #21487 by rogerl1961
Replied by rogerl1961 on topic Stator output.
While the engine is running at 4000 rpm and above what should the voltage read for normal operation?

It seems that the only voltage reading I am getting is what the battery level is at that given moment. Has anyone had luck with EarthX batteries being charged with the Rotax Stator/regulator system? Is an EarthX battery management system (BMS) a bad thing to have on a Rotax 912uls. Since that system can shut off the battery can that type of battery ruin a rectifier?

When testing the yellow wires coming out of the Stator that plug into the rectifier, is there any advantage or disadvantage of not disconnecting them from the rectifier? So far the only test i did on them was with it plugged into the rectifier and testing by putting my meter probes into the socket along with the wire. I wonder will I get true output voltage of the stator this way or will it give me a false voltage reading being connected to the rectifier/regulator? When i tested mine this way I measured AC voltage of 14.5 volts at 2000 rpm and only 20 volts at 4000 rpm. The 20 volts sounds lower than the 30 to 40 volts that the Rotax video says i should see. Thoughts anyone?
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1 week 3 days ago - 1 week 3 days ago #21488 by garrett
Replied by garrett on topic Stator output.
The voltages you are reading are dependent on the electrical loads and the state of charge of the battery. I would think the 30-40 volts A/C would be a no load reading. The DC readings your getting seem fine to me.The problem I found is that after having to start the motor including warmup and taxi times the battery continues to discharge while the engine is at low rpm. Then after take off the charge system gets overloaded while trying to recharge the battery and cover the electrical loads at high rpm and sometimes over heats all the connections associated with the Rotax regulator especially the yellow A/C wires from the stator. Try to let the battery recharged before shut down and minimize any unnecessary loads until just before takeoff.
My experience with Lithium was not good because the battery wanted to recharge (draw a lot more amps than a AGM battery) after takeoff and is what overheated my regulator and electrical connections. I went back to an Odessy PC625 AGM battery which works much better with the Rotax regulator and can take much more abuse safely. To me a lithium battery is not worth it for the the price/little bit of weight savings and danger of an inflight fire. Also on my airplane I added a B&C gear driven alternator then set the regulator 2/10's of a volt higher so that the B&C carries the load although it does not perform well at low rpm's same as the Rotax reg. Hope that helps.
Last edit: 1 week 3 days ago by garrett.
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1 week 2 days ago - 1 week 2 days ago #21491 by rogerl1961
Replied by rogerl1961 on topic Stator output.
Yesterday I did touch and goes. Upon starting the engine i read 13.5 volts. Shortly thereafter (no additional load) at same rpm it read 13.1 volts. I brought rpm up to 4000 and read 13.4 volts. Most of my flight the only current draw was my MGL mini EFIS however the last 20 minutes I had my nav lights on and landing light which i am not sure what current draw that is. At the end of the flight i took out the battery and took it home to charge it and test the voltage. The battery was 13.1 volts. The top of the EarthX battery says 13.2 nominal volts. Does that sound like everything was working properly?

I am so used to seeing 13.8 volts from a charging system (motorcycles, cars etc) that this all seems low to me. one of the posts said that 13.5 volts is the max the 912 puts out...is that correct?

the plug on my rectifier looks fine. No burning and all of the wires looked seated.
Last edit: 1 week 2 days ago by rogerl1961.

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1 week 2 days ago - 1 week 2 days ago #21492 by garrett
Replied by garrett on topic Stator output.
I would contact EarthX for the charging and battery characteristics. I know that Remos Aircraft specifies a different rectifier/charger than the Rotax regulator and an over voltage protection circuit in order to use a EarthX lifepo4 battery.
Last edit: 1 week 2 days ago by garrett. Reason: ad word

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1 week 2 days ago #21493 by garrett
Replied by garrett on topic Stator output.
EarthX Lithium Battery Charging

EarthX lithium batteries can sit on the shelf for up to a year without the need to charge it due to the low self discharge rate which is about 2% a month, compared to a lead acid battery which is approximately 30% per month. (If you have the battery in a vehicle that has a constant draw, such as a Harley, and you don’t ride for a month, you will need to put the battery on a charger). After a long time of no use, it is wise to check the voltage and if it is less than 13.28V, you should charge it before start attempt. Do not leave a battery, lead acid or lithium in a discharged state or the cells will be permanently damaged. Charge immediately if this happens.

In the event you have to charge the battery, use a Lithium (LiFePO4) battery charger or a lead-acid battery charger that does not charge above 14.6V, will automatically turns off when the battery is fully charged (based on volts) and does not have a de-sulfate mode. Do not use any charger with voltage that pulses above 15V! This will damage the battery. If in doubt, consult the manual that comes with your charger.

For chargers with a maintenance mode, the maintenance mode voltage should be 13.3V – 13.9V. For example, the Battery Tender JR has a maintenance mode voltage of 13.3V which is compatible, whereas the original Battery Tender or Battery Tender Plus has a maintenance mode voltage of 13.2V which is too low for a lithium battery. Please read the manual that comes with your charger.

EarthX Lithium batteries have an internal Battery Management System (BMS) to disconnect the battery from the load (your vehicle) if the battery is drained too low. When the battery is “disconnected”, there is no voltage at the battery terminal. Note, some volt-meters may read a small voltage. The EarthX over-discharge protection circuit is automatically reset when a charging current/voltage is present at the battery terminals (referred to as BMS Reset). Or if you have an EarthX battery manufactured after 2017, simply disconnect the negative terminal from the vehicle and it will reset itself and then you put it on a charger. (On the backside of the negative terminal there is a letter and a number, if this number is a 7 or higher, you have this feature built in)

If your battery reads near 0 volts, the over-discharge feature has been activated, thus your battery must be charged. If you left your lights on, key on, have a faulty stator, or have a parasitic drain this can easily happen. Our BMS is designed to disconnect the flow of current in the event of over-discharge (internal disconnect switch is opened). Many smart chargers will not attempt to charge a low voltage battery (below 9V). If this happens, there are several ways to charge the battery.

The easiest way is if you have a charger such as the Optimate lithium charger or one that will engage even if the battery is in this protection mode. Simply connect the alligator clips first, plug in the charger next, and the save mode will come on and start charging it.
Another method is to connect your charger to the EarthX battery as normal, then put either a jump pack or another 12V charged battery in parallel with the EarthX battery so the charger will read it’s voltage and engage. Once the charger sees voltage it begins to charge as normal. After 5-20 seconds you can remove the jump pack or jumper cables (being careful not to disconnect the charger). Recharging this battery from the depleted state can take from a couple hours to overnight. To watch a video of how to do this, go to:

If the battery will not reset and charge after attempting either 1 or 2 above, you could have a damaged cell so do not continue to attempt to use or charge the battery. Do not attempt to charge a battery that is swollen in appearance. Do not attempt to jump start a battery that is swollen in appearance.
The table below shows a list of chargers, and specifically indicates chargers that will work for recharging an “over-discharged” battery. This is not an all inclusive list.

Manufacturer Model Safe to use BMS Reset Suggested Use
ACI 1206S60CC No No Do not use, as full time de-sulfating mode will damage a lithium battery
Adventure Power 1000, 2000, 4000 models Yes No Use as charger, maintainer, but will not reset EarthX’s BMS over-discharge protection
Battery Minder Any model No No Do not use, as full time de-sulfating mode will damage a lithium battery
Black N Decker Any models No No Per the manufacturer, they state it is not safe to charge a lithium battery with any of their models
Christie All Models No No Do not use, as full time de-sulfating mode will damage a lithium battery
CTEC Lithium US Yes Yes Use as charger, maintainer and it will reset EarthX’s BMS over-discharge protection
CTEC All lead acid charger models No No Do not use, as full time de-sulfating mode will damage a lithium battery
Deltran Battery Tender Jr Yes No Use as charger, maintainer, but will not reset EarthX’s BMS over-discharge protection
Deltran Battery Tender (original or Plus) Yes No Can be used for charging only. Maintenance voltage is too low.
Diehard All Models No No Do not use, as full time de-sulfating mode will damage a lithium battery
Duraboost Duraboost 750, 1000 Yes No Can be used for charging. Can not find a maintenance voltage in manual so if it is less than 13.3V, too low.
Duracell Duracell Ultra SLC10002 Yes No Use as charger, maintainer, but will not reset EarthX’s BMS over-discharge protection
H-D (Harley Davidson) Tender Jr Yes No Use as charger, maintainer, but will not reset EarthX’s BMS over-discharge protection
Moose Tender Jr Yes No Use as charger, maintainer, but will not reset EarthX’s BMS over-discharge protection
MotoMaster 10/2A Automatic Charger 10/2A Automatic Yes No Use as charger, maintainer, but will not reset EarthX’s BMS over-discharge protection
Napa All models No No Do not use, as full time de-sulfating mode will damage a lithium battery
NOCO Genius All Models except the lithium specific one No No Do not use, as full time de-sulfating mode will damage a lithium battery
Noco Genius Lithium Noco Genius Lithium Yes No Use as charger, maintainer, but will not reset EarthX’s BMS over-discharge protection
ODYSSEY Ultimizer Yes No Use as charger and maintainer
Pulsetech Xtreme XC100 No No Do not use, as full time de-sulfating mode will damage a lithium battery
Power Pulse PP-12-L No No Do not use, as full time de-sulfating mode will damage a lithium battery
Schauer Charge Master CM6A, CM12A No No Do not use, as full time de-sulfating mode will damage a lithium battery
Schauer JAC0512,1212, 2512 Yes No Use as charger, maintainer
Schumacher Any lead acid model No No Do not use, as full time de-sulfating mode will damage a lithium battery

TecMate/ Optimate

Lithium TM-471, TM-290, TM-291, TM-271, TM-485 Yes Yes Use as charger, maintainer and it will reset EarthX’s BMS over-discharge protection. (The TM-471/485 is not recommended for the aircraft batteries as it will time out and turn off before it charges).
TecMate/Optimate All lead acid charger models No No Do not use, as full time de-sulfating mode will damage a lithium battery
Tenergy 4cell LiFePO4 Smart Charger Yes Yes Use as charger, maintainer and it will reset EarthX’s BMS over-discharge protection
Yuasa Smart Shot 900 Yes No Can be used for charging. Can not find a maintenance voltage in manual so if it is less than 13.8V, too low.
Yuasa Smart Shot 1.5mA No No Do not use, as full time de-sulfating mode will damage a lithium battery
Note: is not an all-inclusive list
As with any battery you are charging, follow these safety tips:

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