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12-18-2019 04:54 PM
zalman
Quote:
Originally Posted by GBS View Post
I also forgot to mention about storage charge - you have to keep them at about 50% charge during times of non-use. The Lithium Battery Store says over 2 months. I've seen other places talk about 2 weeks....more research needed.
Note in the manual from the Store that they also warn about using 2 in parallel - voltages have to be within .01 v of each other.
They say they include a meter so you know the charge level. I'd question them about how it works. Lithiums are known for being VERY constant in their output, and then they die really, really fast. So measuring voltage is a very poor way to estimate remaining capacity. It NEEDS to be an ammeter - measuring total amps used, to give you a better idea of how much is left.
Finally, they say operating range is 41 to 95 degrees. No cold weather fishing, or hot weather fishing, then....

The cells inside need to be balanced - each individually charged to the same level, at least periodically. I didn't see where their chargers have that capability. Something else to ask about....


From my experience with the 36V LiFeP04 lithium batteries in my boat, sitting for 3-4 weeks they drop from 100% SOC to 96%-97% SOC. I could leave them off the charger for several months without worry... but I wouldn't do that even with lead acid batteries. The manufacturer states that it can be up to 5% discharge per month when powered down (at 25 degrees (C) / 77 degrees (F)). I haven't seen nearly that much so far.

I have a dedicated Lithium charger (Delta-q) with a proper lithium charge curve and balancing cycle. I can leave it plugged in constantly if I chose to and it will perform a charge and balancing cycle every week automatically and then power down.

I have 4 36V (25ah) batteries in parallel. My batteries are designed to have up to 20 units in parallel but that will depend on the manufacturer's specifications.

The "meter" they are speaking of is probably the same as mine. It is a gauge that plugs into the BMS of the battery and reads %SOC, Ah used, Ah remaining, Voltage, and a few more settings from the BMS in the battery, it doesn't rely on the voltage reading at the posts.

41-95 degrees? that's a narrow band. My brand has a recommended operating discharge temperature range of -4 (f) to 122 (F) so clearly there is a LOT of variation from one manufacturer to the next.
12-17-2019 11:16 AM
KJINTF You will be very happy with the Li batteries
12-17-2019 09:10 AM
levonluther Anyone that stumbles upon this thread... See the link above there are 50+ pages at time of me posting with way more valuable information than what I can provide.

Looks like people are using them even for starting batteries. Not sure I'm brave enough for that , or have deep enough pockets for all 4 batteries.

Will be going with 3 12V 50AH or 100AH from lithium hub. Messaged them last night had responses by 805 this morning and when responding another one by 830. 5 year warranty.

I have to buy batteries no matter what so I'm $750 at least to get decent ones. Those would fill my entire box (22x23") by the time I add my starting battery and onboard charger. It would also be north of 300lbs.

If I go with the 50AH setup I can put all the batteries on one side and still have room for some stuff at a total weight of 100#.

3x50AH = $1335 shipped
3x100AH = $2520 shipped
1x125AH = $1025 shipped (what people are using for starting + all other items on boat)

4 bank Charger would be a wash regardless of what way I go
5 year warranty... So that would be at LEAST 1 more set of lead batteries to be purchased.




Sent from my Pixel 2 using Tapatalk
12-15-2019 10:14 PM
Seaark1660 I'd love to have one of those 24v batteries,but that price?Ouch!But a 30lb battery that fits in the same box as a 31 series is awfully tempting.May go that route if I ever need to go 24v TM.
12-15-2019 10:24 AM
Ozark Bob
Quote:
Originally Posted by clawman View Post
As always have a fire extinguisher on board... probably at hand if you are using lithium batteries.
The FAA still does not allow removable lithium batteries on any flights.
Good Luck!!
Look up LiFeP04 batteries.(Marine batteries) They have the same fire rating as lead acid batteries. Other Lithium technologies are not the same. Bob
12-15-2019 08:44 AM
clawman
fire extinguisher

As always have a fire extinguisher on board... probably at hand if you are using lithium batteries.
The FAA still does not allow removable lithium batteries on any flights.
Good Luck!!
12-15-2019 07:31 AM
KJINTF http://www.bbcboards.net/showthread.php?t=982657


Check out the above link.



For me YES YES YES changing to Li batteries has been wonderful. Two 100amp/hr Lifepo4 in the boat for the 24volt Ulterra, four 200amp prismatic cells for the RV excellent for inverter usage, several Li batteries for the drones, two Li battery packs for the Gopro, the Garmin GPS uses them, my phone and tablets use them, the list goes on and on.



Just re-read your first post

95% of my fishing is on a big River in a 17ft Deep V boat - the Li batteries and the 24Vdc Ulterra do great in the river current - use spot lock all the time




Sure they require a bit different maintenance as compared to the old Lead Acid things. If you look around and read the above thread you can get two 100amp/hr LIFEPO4 "12Vdc" group 31 drop in batteries fro just over $1K.
12-15-2019 07:23 AM
Snowking Dakota lithion Battery’s brand have a listed operating temp of -20 to +125. I not going to be ice fishing under -20 with my 10 amp battery. Some of the lithion battery’s you can not connect to each other. Some you can.
12-14-2019 11:13 PM
GBS I also forgot to mention about storage charge - you have to keep them at about 50% charge during times of non-use. The Lithium Battery Store says over 2 months. I've seen other places talk about 2 weeks....more research needed.
Note in the manual from the Store that they also warn about using 2 in parallel - voltages have to be within .01 v of each other.
They say they include a meter so you know the charge level. I'd question them about how it works. Lithiums are known for being VERY constant in their output, and then they die really, really fast. So measuring voltage is a very poor way to estimate remaining capacity. It NEEDS to be an ammeter - measuring total amps used, to give you a better idea of how much is left.
Finally, they say operating range is 41 to 95 degrees. No cold weather fishing, or hot weather fishing, then....

The cells inside need to be balanced - each individually charged to the same level, at least periodically. I didn't see where their chargers have that capability. Something else to ask about....
12-14-2019 07:35 PM
levonluther
Quote:
Originally Posted by Relaxin17803 View Post
You can get a 36 volt 40 AHr battery from the Lithium Battery store for under 1200.00.
Hadn't found that store yet, that is for sharing. Might have to do some more research on them as far as quality, but I see they have a two year warranty. That 100AH is VERY attractive. One battery vs 3 , and I would free up some space to put some gear that's currently burning up prime real estate in the boat.

To the other post - I don't know if I need more than one 100AH. I'm guessing no. But there's so little real world feedback it's hard to know for sure.

Sent from my Pixel 2 using Tapatalk
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