Re: [electricboats] Battery Recommendations

I just bought a DC house 12v 50ah battery for a trolling motor I use for trolling motor I use on my dinghy. Only got a couple hours use so far, but it seems good and it only weighs 20 lbs. Good luck. 

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Re: [electricboats] Battery Recommendations

I have only day sailed with the Spirit motor and battery, so my speeds
were always low and would rarely use up more than 10% charge. I was
gathering data on self discharge in order to figure out how to charge in
the off season and on day 28, the system would not turn on until I
connected the charger. It did accept a charge. I have repeated this
sudden drop in charge level while idle. The first time was with cables
connected and I subsequently found out Bluetooth is drawing power
looking for the wireless remote even when the system is off and even
though my remote is the wired model.

The sudden drop also occurs with the cables disconnected, but takes
months instead of days. Charging after these events is more rapid than
should be possible which indicates to me there is still capacity there,
but the BMS has seen a cell it doesn't like and shuts things down. A
dealer informs me that I would have to substantiate the problem, send
the battery for analysis, and then hope for a fix or a replacement. My
warranty would run out before all that could happen, so hence the search
for alternative power.



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Re: [electricboats] Battery Recommendations

I do transport my boat batteries here and there, so weight is an issue.
The GrenerPower at about 33 lbs.was about all I can handle. I have
thought about going down to the next size.



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Re: [electricboats] Battery Recommendations

When your epropulsion battery quits with 40% remaining, what exactly does it do?

 

Because if you are running near full throttle when it shuts off, then it comes back on and you are able to use it at lower throttle settings, then that would indicate voltage sag cutoff.

 

This could be because of the teny tiny wires epropulsion uses that cannot take much current without significant voltage drop.

 

Voltage sag may not be your problem at all, I'm just thinking out loud.

 

I saw one video of someone that hacked their electric outboard (don't remember the brand) and put in larger wires to the circuit board with larger connectors. If I remember correctly, he did this because his OEM connectors kept failing (something like every 6 months), NOT because of voltage sag.

I guess he was disconnecting and reconnecting several times a week on his dingy, while cruising and putting his dingy on deck when moving the big boat. And after a few months the pins in the OEM connectors would loosen up and he would have to wiggle it to even get it to work at all.

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Re: [electricboats] Battery Recommendations

I also have 4 of the 100 Ah LFP batteries (with Bluetooth) from WattCycle, I have had a problem with one. It disconnected itself (may have been my fault) and would not take a charge or show any voltage across the terminals. The Bluetooth app showed crazy cell voltages from 3.2V to negative 0.8V.

I researched and found some people had good luck disconnecting and re-connecting the internal BMS so that is what I wound up doing and it cured my problem and showed cell voltages nearly identical, and also nearly full. No issues since.

 

Why I say it may have been my fault is because I had left this one battery connected to a 2500 watt 12V inverter (12" long 8ga wire) in the front floorboard of my truck. I had been using this as a portable 110v power supply for a 7 ¼" circular saw. I had left it connected so I wouldn't have to use a resistor to reconnect it when I needed it again. But the next week when I went to use it, the inverter power switch was on but no lights or output from the inverter. I guess the switch got turned on while bouncing around and I thought my only issue was a discharged battery but it was the BMS issue above. It was easily fixable but I prefer things that don't break, as opposed to something that has a good warranty or is easily fixible when it does break.

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Re: [electricboats] Battery Recommendations

I have 4 of these currently running in my home UPS system, 2 are 2 months old, 2 are 5 months old, and no problems yet. These may be a larger (and heavier) than what you are looking for but they have built in Bluetooth and are still way cheaper that the epropulsion.

 

Re: [electricboats] Battery Recommendations

Thanks for your insight. I have not found any reviews specific to this battery. There are some posts regarding GrenePower batteries and don't see any red flags. Perhaps I might try again - after I determine my refund was credited. My ePropulsion battery is certainly high-priced and even so has reliability issues. It shuts down suddenly with over 40% charge remaining and finding the cure is not straightforward. Support from GrenePower was very good - after the initial smoke-blowing. ePropulsion support is negligible. Maybe I can get Will to do a tear-down? The search continues...

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