#32438

开云体育

I’m looking at buying a Pearson 10M that has been fitted with a Thunderstruck 10k and bank of 4 lithium battery packs for 196 AH 48V. All that checks out and fits fine with my needs and wants for the boat. The current owner did the install and it looks good. A couple of questions based on my reading:

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The boat will get stored somewhere around Lake Ontario outdoors over the winter. From what I read, it is best to store the batteries somewhere so they don’t get subjected to sub zero temps so I plan to just pull them and put them in my basement over the winter. Also it seems it is best to have them somewhere around 80% capacity – i.e. not full charge.

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Looking for tips on keeping the batteries safe while sailing – they are installed well under the starboard cockpit seat and rear quarterberth area. I don’t plan to sail in extreme weather and the area looked perfectly dry when I checked the boat out in the marina and out for a short sail in very very light breeze. Just wondering what sort of precautions aside from securing them very well people take to make sure the cells are never exposed to water. Basically this is a question asking, assuming it is well installed, are there some upgrades or best practices about insulating the connectors and such that can help further reduce issues that could be encountered – this is the nightmare scenario of a fire starting.

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Thanks,

Scott

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#32439

Hi Scott,

I have a Kirby 30 on Lake Ontario (at TSCC) with a Thunderstruck Kit as well and 3 48V/96 Ah Dakota Lithium packs wired in serial, this is my second season with the install.? In prior years I've removed the batteries from the boat for the winter and stored them indoors however at 80 lbs per battery that's a real chore.? I've reached out to Dakota Lithium to see if I could leave them in the boat as long as I disconnected the negative terminals so that they don't cross charge.? I'll let you know what I find out.

Regarding the install, as long as the owner did a good job bracing the batteries down, you should be ok in rough weather.? I built a Starboard tray and cover for mine and have the batteries bolted down where the old fuel tank used to be (under the cockpit).? I've been out in some really bouncy Lake Ontario waves and have never had a problem with the engine or the batteries.

Regards,
Jeff.

#32440

开云体育

Hi Scott,

Regarding your question 1, there is nothing wrong with storing your batteries in your basement.? However, I do not believe you have to do that.? From what I have read, you are not supposed to CHARGE the batteries in freezing temperatures, but it is OK to STORE them at those temperatures.? Mine have been fine here in northern Ohio.

Note that I am NOT an expert, so those who know better, feel free to correct me.

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Pat

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Show quoted text

From: [email protected] On Behalf Of Scott E Erdman via groups.io
Sent: Monday, October 9, 2023 11:43 AM
To: [email protected]
Subject: [electricboats] a couple of questions

?

I’m looking at buying a Pearson 10M that has been fitted with a Thunderstruck 10k and bank of 4 lithium battery packs for 196 AH 48V. All that checks out and fits fine with my needs and wants for the boat. The current owner did the install and it looks good. A couple of questions based on my reading:

?

The boat will get stored somewhere around Lake Ontario outdoors over the winter. From what I read, it is best to store the batteries somewhere so they don’t get subjected to sub zero temps so I plan to just pull them and put them in my basement over the winter. Also it seems it is best to have them somewhere around 80% capacity – i.e. not full charge.

?

Looking for tips on keeping the batteries safe while sailing – they are installed well under the starboard cockpit seat and rear quarterberth area. I don’t plan to sail in extreme weather and the area looked perfectly dry when I checked the boat out in the marina and out for a short sail in very very light breeze. Just wondering what sort of precautions aside from securing them very well people take to make sure the cells are never exposed to water. Basically this is a question asking, assuming it is well installed, are there some upgrades or best practices about insulating the connectors and such that can help further reduce issues that could be encountered – this is the nightmare scenario of a fire starting.

?

Thanks,

Scott

?

#32441

Check with battery manufacturer. I have Winston cells - their spec sheet shows operating down to -45c. Does it get colder than that where you ?winter?

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#32442

开云体育

I agree with this.? I have left my battery (48V LiFePo4, 280AH) on the boat stored outside for the winter in NE Ohio.? Last season they were at something like 53.25 volts when I put the boat way and 53.24V in spring after 6 months of no inputs or outputs. ?? Rock solid.? I have a Victron 712 monitor with Bluetooth and I would just drive by the boat and check the condition from my phone without getting out of my car.

My battery is made from prismatic cells and was assembled in place on the boat.? Removing it from the boat is not practical and would require disassembly.? That is likely to cause more wear and tear and more potential damage just from messing with it.? Te whole unit is about 200 lbs and it would not be practical to lift it out for winter storage.? And I don't think there i a need so long as it is not being charged in freezing conditions.? And there is no need to trickle charge these batteries if there is no load on them.?

FYI on the Pearson 10M, make sure the keel is blocked properly.? The aft section is a fiberglass fairing and can be damaged from improper blocking.?

Dan Pfeiffer

Show quoted text

On 2023-10-09 11:24 am, greenpjs04 wrote:

Hi Scott,

Regarding your question 1, there is nothing wrong with storing your batteries in your basement.? However, I do not believe you have to do that.? From what I have read, you are not supposed to CHARGE the batteries in freezing temperatures, but it is OK to STORE them at those temperatures.? Mine have been fine here in northern Ohio.

Note that I am NOT an expert, so those who know better, feel free to correct me.

?

Pat

?

?

From: [email protected] On Behalf Of Scott E Erdman via groups.io
Sent: Monday, October 9, 2023 11:43 AM
To: [email protected]
Subject: [electricboats] a couple of questions

?

I'm looking at buying a Pearson 10M that has been fitted with a Thunderstruck 10k and bank of 4 lithium battery packs for 196 AH 48V. All that checks out and fits fine with my needs and wants for the boat. The current owner did the install and it looks good. A couple of questions based on my reading:

?

The boat will get stored somewhere around Lake Ontario outdoors over the winter. From what I read, it is best to store the batteries somewhere so they don't get subjected to sub zero temps so I plan to just pull them and put them in my basement over the winter. Also it seems it is best to have them somewhere around 80% capacity – i.e. not full charge.

?

Looking for tips on keeping the batteries safe while sailing – they are installed well under the starboard cockpit seat and rear quarterberth area. I don't plan to sail in extreme weather and the area looked perfectly dry when I checked the boat out in the marina and out for a short sail in very very light breeze. Just wondering what sort of precautions aside from securing them very well people take to make sure the cells are never exposed to water. Basically this is a question asking, assuming it is well installed, are there some upgrades or best practices about insulating the connectors and such that can help further reduce issues that could be encountered – this is the nightmare scenario of a fire starting.

?

Thanks,

Scott

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