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Old 09-22-2020, 05:13 PM   #1
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Lithium ion phosphate batteries on sale

I was looking at LiFEPO4 batteries for my house bank. They are running around $950 to $999 each. Just found the Lion Energy UT 1300 in a 2 pack at Costco for $1399 with free shipping. The sale is good until 9/27. I just joined Costco for $60 just to get these batteries. They have a lifetime warranty on them. No affiliation.
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Old 09-22-2020, 05:43 PM   #2
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How are these vs Battleborn?
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Old 09-22-2020, 05:50 PM   #3
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I believe they are pretty comparable but with a lifetime warranty instead of BB 10 year warranty with the last 2 years prorated. Also the BB are $949 each. So for $700 each they seem like a good deal???
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Old 09-22-2020, 05:58 PM   #4
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About the same as a Firefly.

I'm weighing the carbon foam vs the Lifepo4 stuff- found out today that my charger is 100% compatible (yay!)....now have to just make the call if I'm going to separate the house bank (inverter/charger only) from the start/genset bank (separate 40A charger and alternators) or combine the whole mess.

Challenge is that the charge profiles are very different, and the current way we use the boat, we can conceivably have the house bank charged only via genset and keep the alternators as they are.
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Old 09-22-2020, 06:01 PM   #5
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Old 09-22-2020, 06:28 PM   #6
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The price is rough to get past. 4 Lithium $3800 for 400 amphrs. 8 6volt Wet cell golf cart $1200 for about 450 amphrs usable capacity.
Will the lithium last 15 years? I think if they do, the cost could be worth it. In 15 years you would go through three sets of wet cells and spend $3600.
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Old 09-22-2020, 06:43 PM   #7
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The price is rough to get past. 4 Lithium $3800 for 400 amphrs. 8 6volt Wet cell golf cart $1200 for about 450 amphrs usable capacity.
Will the lithium last 15 years? I think if they do, the cost could be worth it. In 15 years you would go through three sets of wet cells and spend $3600.
Indeed. I'm also looking at the weight factor and reducing the number of batteries for the house bank...
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Old 09-22-2020, 07:01 PM   #8
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I can trade 256 pounds of batteries for 46 pounds. Also to expand my battery bank with 6 volt batteries I would have to replace the aft A/C that is a split system with a self contained system at a cost of about $2400 plus the work to do the install in order to get the room for more batteries. Plus the LiFePO4s take a charge much faster. Lifetime warranty. It is a no brainer for me. Plus my 6 volt batteries are getting long in the tooth.
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Old 09-22-2020, 07:10 PM   #9
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Sounds like the case vs. moisture discussion in the video above might be a big deal on the boat.
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Old 09-22-2020, 07:14 PM   #10
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I have not received the batteries yet since I just ordered them. I am not too concerned since they are in a dry location in my engine room. As to the case being too thin or something they only weigh 23 pounds. The case doesnít have to be too strong for 23 pounds. They arenít 8Ds...
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Old 09-22-2020, 07:21 PM   #11
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In my experience (cruising with Firefly batteries), I think the ability of these newer technology batteries being able to charge faster and perform in a partial state of charge continuously is equally as important a consideration as available amp hours and up front costs.
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Old 09-22-2020, 08:17 PM   #12
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Quote:
Originally Posted by fryedaze View Post
The price is rough to get past. 4 Lithium $3800 for 400 amphrs. 8 6volt Wet cell golf cart $1200 for about 450 amphrs usable capacity.
Will the lithium last 15 years? I think if they do, the cost could be worth it. In 15 years you would go through three sets of wet cells and spend $3600.
4 Lithium at Costco $2800
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Old 09-22-2020, 08:19 PM   #13
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Sounds like the timing is right with them being priced low and a great warranty. Plus no need to do any air conditioner work either.
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Old 09-22-2020, 08:32 PM   #14
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If you are starting from GO, the costs involved in cabling and boxing all those LA batts gets to you after a bit further narrowing the overall cost numbers.
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Old 09-22-2020, 11:28 PM   #15
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Looked at Costco on line and couldn't find them!

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Old 09-23-2020, 12:46 AM   #16
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I searched the Costco site for UT 1300 and they came up. The price didn’t come up until I got logged in as a member.
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Old 09-23-2020, 05:40 AM   #17
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Quote:
Originally Posted by Pau Hana View Post
About the same as a Firefly.

I'm weighing the carbon foam vs the Lifepo4 stuff- found out today that my charger is 100% compatible (yay!)....now have to just make the call if I'm going to separate the house bank (inverter/charger only) from the start/genset bank (separate 40A charger and alternators) or combine the whole mess.

Challenge is that the charge profiles are very different, and the current way we use the boat, we can conceivably have the house bank charged only via genset and keep the alternators as they are.

Peter,


Please keep us posted as you pursue this. We would love to know what you end up with, why, and after a bit... how happy you are with your choice.
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Old 09-23-2020, 07:27 AM   #18
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4 Lithium at Costco $2800
At that price, 12 years is break even. If there prices keep dropping wet cell house banks will be a thing of the past.
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Old 09-23-2020, 08:47 AM   #19
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One thing I have a concern about is the size and durability of the battery posts. Can 4/0 cables work on these posts? At an M6 size (that's under a 1/4 inch) and only 12lbs. torque it seems like it would make some iffy connections.

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Old 09-23-2020, 08:54 AM   #20
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One thing I have a concern about is the size and durability of the battery posts. Can 4/0 cables work on these posts? At an M6 size (that's under a 1/4 inch) and only 12lbs. torque it seems like it would make some iffy connections.

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I'm no engineer, but I see the contact area of the posts should be sufficient for the load- the mechanical connection holds the terminals tight, but should not be the issue.
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