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Old 23-11-2017, 14:01   #1
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Lipo vs lifepo4

Here is one for the battery gurus out there is there a reason not to use Lipo batteries as opposed to lifepo4. ( I can get them for about $1.50 per ah Lipo or $5 per ah lifepo4 ) I intend on installing a total of 4 100ah batteries. For a total of 400ah ( replacements for my Fla 440ah bank)
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Old 23-11-2017, 16:32   #2
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Re: Lipo vs lifepo4

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Originally Posted by newhaul View Post
Here is one for the battery gurus out there is there a reason not to use Lipo batteries as opposed to lifepo4. ( I can get them for about $1.50 per ah Lipo or $5 per ah lifepo4 ) I intend on installing a total of 4 100ah batteries. For a total of 400ah ( replacements for my Fla 440ah bank)


Thermal runaway.
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Old 23-11-2017, 17:15   #3
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Re: Lipo vs lifepo4

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Thermal runaway.
Yupp. Afaik LiPo os the most hazardous Li battery chemistry:



400Ah of that would probably level half of the marina...
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Old 23-11-2017, 17:59   #4
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Re: Lipo vs lifepo4

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Yupp. Afaik LiPo os the most hazardous Li battery chemistry:



400Ah of that would probably level half of the marina...
yes it might at that if you intentionally drive a nail through the entire battery shorting all of the plates bet you would have disastrous results with an agm or Fla if you intentionally cause a dead short in them to.
They would be in individual 100ah batteries spread out in my engine room . I can get the lifepo4. In the same format. Wonder what they would do if you drive a nail through it.
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Old 23-11-2017, 18:45   #5
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Re: Lipo vs lifepo4



lots of smoke, no fire

Cheers
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Old 23-11-2017, 18:47   #6
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Re: Lipo vs lifepo4

Just got a message from the supplier and these $1.50 an ah batteries are what I am going to get . Turns out they are lifepo4 not Lipo now do I get 4 of the 100ah. Or 2 of the 160ah batteries. Replacing 440 ah of Fla gc2's. I estimate my daily to be about 50ah a day once I install the refer.
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Old 23-11-2017, 18:49   #7
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Re: Lipo vs lifepo4

It generally takes 4 to make 12 volts. Unless they're already in a 12 volt format.

Cheers.
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Old 23-11-2017, 19:20   #8
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Re: Lipo vs lifepo4

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It generally takes 4 to make 12 volts. Unless they're already in a 12 volt format.

Cheers.
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12 volt format 100ah or 160 ah so with 4 units I would have 400ah or use the 160ah to have 340ah. The best part is the manufacturer told me they both have a 1.5C charge rate.

Considering the info I received today the question of this thread became moot.
I am going with lifepo4.
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Old 23-11-2017, 20:17   #9
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Re: Lipo vs lifepo4

Yes LFP is the only LI chemistry suitable for mobile House bank usage.

But 12V dropi-ns have internal BMS. No comms to outside, no way to check for cells imbalance

Parallel a cheap lead buffer batt in there hardwired to alt output, also to prevent damage to sensitive loads

if/when the BMS isolates unexpectedly

I personally would go with prismatics 4s2p, per AH not more expensive, with a known good mfg Winston/CALB/GBS likely better longevity.

Also too many parallel violates KISS, own balance issues.
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Old 23-11-2017, 20:27   #10
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Re: Lipo vs lifepo4

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Yes LFP is the only LI chemistry suitable for mobile House bank usage.

But 12V dropi-ns have internal BMS. No comms to outside, no way to check for cells imbalance

Parallel a cheap lead buffer batt in there hardwired to alt output, also to prevent damage to sensitive loads

if/when the BMS isolates unexpectedly

I personally would go with prismatics 4s2p, per AH not more expensive, with a known good mfg Winston/CALB/GBS likely better longevity.

Also too many parallel violates KISS, own balance issues.
Charging will be via 400 Watts solar. ( Controller is fully programmable and temperature compensating). Alternator will be a 150 amp small frame unit on the new main ( have allocated 8 to 10 horse to run it) when I need a boost in power. The biggest question I have is if I'm replacing 400ah fla ( GC2) with a 50 ah daily load how much lifepo4 do I need ( ah wise) .
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Old 23-11-2017, 21:27   #11
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Re: Lipo vs lifepo4

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Charging will be via 400 Watts solar. ( Controller is fully programmable and temperature compensating). Alternator will be a 150 amp small frame unit on the new main ( have allocated 8 to 10 horse to run it) when I need a boost in power. The biggest question I have is if I'm replacing 400ah fla ( GC2) with a 50 ah daily load how much lifepo4 do I need ( ah wise) .
250AH covers the FLA capacity, gives cover for bad weather and load spikes.

Maybe even 200.

Disable temp comp
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Old 23-11-2017, 21:45   #12
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Re: Lipo vs lifepo4

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250AH covers the FLA capacity, gives cover for bad weather and load spikes.

Maybe even 200.

Disable temp comp
Ok so 200 it is . ( Worst case is I motorsail for an hour ) good time to make water to)
Why disable the temp compensating on the solar?
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Old 23-11-2017, 22:48   #13
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Re: Lipo vs lifepo4

So you going to tell us where you are getting these for that price?

Matt
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Old 23-11-2017, 23:01   #14
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Re: Lipo vs lifepo4

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So you going to tell us where you are getting these for that price?

Matt
dmd power thru Alibaba.com

Also found a guy online that is doing a test of the bank so far so good. I'm still waiting for shipping costs the prices I got are fob the factory
At that price its worth a shot. Just have to keep an eye on them for a while.
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Old 24-11-2017, 04:35   #15
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Re: Lipo vs lifepo4

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dmd power thru Alibaba.com

Also found a guy online that is doing a test of the bank so far so good. I'm still waiting for shipping costs the prices I got are fob the factory
At that price its worth a shot. Just have to keep an eye on them for a while.
Wow, that is almost 4X cheaper than current cells. Personally, I get very nervous when a competing product is that much cheaper. Especially when there are multiple players in the market and they are all priced similarily. Makes me wonder how these guys can go so cheap.

Anyway.. I really hope they work out for you as it would be great for other cruisers. Please report back..
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