开云体育

Battery Recommendations

Walter Pearson All Messages By This Member #32837 开云体育 Thanks for comments on ePropulsion and GrenerPower batteries. The Spirit Plus battery is only specified as Lithium Ion Polymer. The BMS may be working well in that it senses a problem cell, but could it also be that it failed to provide the cell balancing function which would produce that problem cell? There is no communication between users and ePropulsion; the dealers are our only option and finding a responsive one is elusive. I joined the ePropulsion group on Facebook and did see posts from others experiencing sudden shutdowns, but the group is moderated by ePropulsion sales and marketing, so technical help is scarce. The only dealer I have found that would address the shut-down issue claims there can be three possibilities - corrosion at connections, failed BMS, or cell failure. Corrosion is not likely, but narrowing down between BMS and cell(s) requires shipping and testing and confirmation videos, etc., - not something I want to do – nor pay to have done. An excerpt from the manual regarding storage and self-discharge: ? Before long time storage, ensure the battery charge level is 60% around, store the battery in 15°C ~ 25°C (59°F ~ 77°F) ambient temperature.? If the battery level is larger than 60% for more than ten days without activity, the battery itself will discharge with a small current around 100mA until it reaches the 60% battery level. ? Battery will actively discharge to 75% after 20 days without charging or discharging. ? If battery level is low for a long time, it will enter sleep mode. Charge to wake it up. ? During long time storage, activate the battery every 3 months by a charge condition and keep the battery charge level at 60% around. This activation is very important and it can help to keep the battery in good condition. ? After long time storage, fully charge the battery before use. ? From my self-discharge data, there is evidence that the mentioned 100mA load is applied which increases the self-discharge rate for a short period. It does not quite reach the 60% level before continuing at a lower rate. It’s the sudden drop I don’t like. I plan to test with bollard pull soon to determine whether this occurs under load and, if so, whether shutdowns repeatedly occur at the same charge level. ? ? I previously used the term sudden loss of charge (SLoC), but from subsequent charging, it appears that the battery does not suddenly lose 40% of its charge. It just becomes unavailable due to shutting down. See charge plot: ? Note that I have the Spirit 1.0 Evo Remote which has a permanently fixed remote throttle and display panel. When the battery is removed from the boat, there is no integral charge level indication. I purchased the ePropulsion Battery Activator that displays charge level. I now have a grid charger and solar controller for nominal 48V LiFePO4, so might try the GrenerPower battery again and hope for one at normal shipping charge condition.
steve sawtelle All Messages By This Member #32838 开云体育 This is interesting information. I also have a couple of epropulsion motors and had not seen this information about storage.? Too bad that the epropulsion forum is hosted on a social media platform.? I wonder if the sudden drop you see is from it going into sleep mode, so that you can’t read the actual voltage? The Activator manual says it will not activate a battery in sleep mode. I don’t have an activator so I can’t verify what you are seeing.? Reading the activator manual, there seems to be some odd things: They say after 10 days it will self discharge to 60%, but then they say it will discharge to 75% after 20 days?? I use very little of the total capacity. I have never been below 80%. So how do I get it to the preferred 60%? Run the motor for a several hours? If it automatically self discharges to 60% after 10 days then why would I need to pre- discharge it?? One thing that irks me about the battery, especially if the discharge level is so important, is why the battery has no indicator of charge state? As it is I have to hook it up to the motor and controller to see the state. Or buy the Activator I guess.? And how do I charge it to 60%? I’d have to babysit the charger and periodically unhook the charger and hook up my motor and controller (or activator) to see charge state? If charge state is so important then why don’t they have a smarter charger that can keep the battery at the proper level? I imagine most use cases include long periods of storage.? All that being said, I do like the motor. I am amazed at how long the battery can run.? -Steve toggle quoted message Show quoted text On May 29, 2025, at 11:45?PM, Walter Pearson via groups.io <pearson1854@...> wrote: ? Thanks for comments on ePropulsion and GrenerPower batteries. The Spirit Plus battery is only specified as Lithium Ion Polymer. The BMS may be working well in that it senses a problem cell, but could it also be that it failed to provide the cell balancing function which would produce that problem cell? There is no communication between users and ePropulsion; the dealers are our only option and finding a responsive one is elusive. I joined the ePropulsion group on Facebook and did see posts from others experiencing sudden shutdowns, but the group is moderated by ePropulsion sales and marketing, so technical help is scarce. The only dealer I have found that would address the shut-down issue claims there can be three possibilities - corrosion at connections, failed BMS, or cell failure. Corrosion is not likely, but narrowing down between BMS and cell(s) requires shipping and testing and confirmation videos, etc., - not something I want to do – nor pay to have done. An excerpt from the manual regarding storage and self-discharge: ? Before long time storage, ensure the battery charge level is 60% around, store the battery in 15°C ~ 25°C (59°F ~ 77°F) ambient temperature.? If the battery level is larger than 60% for more than ten days without activity, the battery itself will discharge with a small current around 100mA until it reaches the 60% battery level. ? Battery will actively discharge to 75% after 20 days without charging or discharging. ? If battery level is low for a long time, it will enter sleep mode. Charge to wake it up. ? During long time storage, activate the battery every 3 months by a charge condition and keep the battery charge level at 60% around. This activation is very important and it can help to keep the battery in good condition. ? After long time storage, fully charge the battery before use. ? From my self-discharge data, there is evidence that the mentioned 100mA load is applied which increases the self-discharge rate for a short period. It does not quite reach the 60% level before continuing at a lower rate. It’s the sudden drop I don’t like. I plan to test with bollard pull soon to determine whether this occurs under load and, if so, whether shutdowns repeatedly occur at the same charge level. ? <RexGDDPxcjM0G7HG.png> ? I previously used the term sudden loss of charge (SLoC), but from subsequent charging, it appears that the battery does not suddenly lose 40% of its charge. It just becomes unavailable due to shutting down. See charge plot: ? <4EqioggODdPJkvHm.png> Note that I have the Spirit 1.0 Evo Remote which has a permanently fixed remote throttle and display panel. When the battery is removed from the boat, there is no integral charge level indication. I purchased the ePropulsion Battery Activator that displays charge level. I now have a grid charger and solar controller for nominal 48V LiFePO4, so might try the GrenerPower battery again and hope for one at normal shipping charge condition.

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