LiFeP04, your complete system cost

[newhaul]

Originally Posted by john61ct

Depends which one. Custom voltage at 13.75 possible?

Turn off temp comp?

What is the minimum possible Absorb Hold Time?

What will you do to prevent Float?

ok voltage : yes can set to the hundredth of a volt .
Temp compensation : yes don't plug in sensor disables feature.
Aht can be set to 0
Float : can be disabled.
Lvc : I will run all loads on my boat via the 30 amp load output on controller . ( so it would function as the lvc to protect the bank) .

[john61ct]

Originally Posted by newhaul

seems to work out to about $125 per 100ah

It does not scale that way.

Someone being very careful could easily spend $1000 protecting a 100AH bank.

Someone less averse to risk may rely on their own monitoring and play completely "bareback" with 4000AH.

Someone who really knows programming and sourcing cheap Chinese circuitry may put a bulletproof system together for $200 their hardware-only costs.

A noob paying that expert may need to spend over $1000 for a custom turnkey system plus training, then a service contract / retainer of $500 a year for support.

Another metric is look at a Victron / Lithionics packaged system, and then deduct the price of the bare cells, at what you can buy them for.

That is the cost of their BMS.

As more open-hardware / FOSS BMS projects mature over time, this is where total cost of going LFP will start to come down.

The cells themselves, not so much IMO.

[newhaul]

Originally Posted by john61ct

No LVD on a bank costing thousands would be ill advised.

100ah 1s4p prismatic less than $300

[john61ct]

Originally Posted by newhaul

ok voltage : yes can set to the hundredth of a volt .
Temp compensation : yes don't plug in sensor disables feature.
Aht can be set to 0
Float : can be disabled.
Lvc : I will run all loads on my boat via the 30 amp load output on controller . ( so it would function as the lvc to protect the bank) .

What controller, link please?

Can you set load output LVD to 12.15 or 12.25 as you prefer?

Independent pass-through LVDs for different ampacities and how essential the circuit would be better.

Many SC load outputs are pretty limited,

some won't run all device types, designed for resistive only like street lighting.

like a fuse, do not let total approach the max spec.

[john61ct]

Originally Posted by newhaul

100ah 1s4p prismatic less than $300

Ah you were the member with the maybe-LFP Alibaba experiment?

You were indicating NBD if that turned out to be NG over time anyway? If so NP, low cost way to dip your toes.

Others may want a link to your thread on those with the source info, or start a new one, maybe we'll come across someone else with experience.

Being a drop-in, the "last level failsafe protection's already built in right?

Still might be good to over time "design as if" you will replace it with a known-good prismatic bank.

[newhaul]

Originally Posted by john61ct

What controller, link please?

Can you set load output LVD to 12.15 or 12.25 as you prefer?

Independent pass-through LVDs for different ampacities and how essential the circuit would be better.

Many SC load outputs are pretty limited,

some won't run all device types, designed for resistive only like street lighting.

like a fuse, do not let total approach the max spec.

p30l controller from windy
Checked my manuals and the solar controller is only to within a tenth of a volt its the wind generator that is micro adjustable.
My solar controller output is 30 amp ( one of the reasons I got it)
the only real load will be the holding plate refer system which draws approx 4 amps . Variable ( basing my amp estimate on the install I did on the Spencer. )
should be less due to great insulation .
Everything else is led except my propane solenoid, water pump and watermaker.
Have already run all but the refer thru the controller. All on at the same time estimate less than 12 amps draw.

[newhaul]

Originally Posted by john61ct

Ah you were the member with the maybe-LFP Alibaba experiment?

You were indicating NBD if that turned out to be NG over time anyway? If so NP, low cost way to dip your toes.

Others may want a link to your thread on those with the source info, or start a new one, maybe we'll come across someone else with experience.

Being a drop-in, the "last level failsafe protection's already built in right?

Still might be good to over time "design as if" you will replace it with a known-good prismatic bank.

forgive my old but NBD? NG? less ah than advertised from that seller so I'm looking at many others. And yes via PayPal. Will do a new thread when I finally get around to this experiment. ( would rather experiment on my own vessel not customers.)

[john61ct]

Originally Posted by newhaul

forgive my old but NBD? NG?

No big deal, No good.

[newhaul]

Originally Posted by john61ct

No big deal, No good.

thought so but can never tell now days

[notz]

Originally Posted by daletournier

Hi, theres several threads running regarding LiFepo4.

More and more people are going this way for good reasons and I assume they will keep gaining more and more acceptance.

Cost is often disscussed as a deterent . It would be good to hear from those that have done the conversion to LiFepo4 regarding their costs.

What is your complete system , not including generators and solar. Lets talk batteries ,BMS , regulators and anything else specific to Lifepo4. It would be great to know the real costs of individual setups if they are willing to tell.

Please lets not turn into a better a debate of for and against. Lets just keep it factual, just numbers and what you have.

Cheers Dale.

I went with a full Victron LiFePO4 system, 300 amp hours, all of the control systems, and a 3000w MultiPlus inverter. You can see the detailed list of everything at https://sailbits.com/correcting-the-...system-design/

I've also included the diagram below.



In terms of cost, if I do not include the alternator systems, solar charger and panels, and inverter, I was around $4000 USD. Prior to this system I tested and used Firefly Oasis, and loved them as well.

[Opie91]

This seems almost too good to believe....


https://www.ev-power.eu/Winston-40Ah...b87v3hm18i7mt4

[travellerw]

Originally Posted by Opie91

This seems almost too good to believe....


https://www.ev-power.eu/Winston-40Ah...b87v3hm18i7mt4

Unfortunately, I could not get them to ship outside EU. The logistics of shipping ADR goods made the price very high.

[newhaul]

Originally Posted by newhaul

100ah 1s4p prismatic less than $300

shipping cost was to high for the 100ah cells so I'm doing a 4s4p with 25ah cells

Also seemed to have a problem with finding a bms that would do the 1s4p configuration.
Shipping for 4 (100ah cells was 260 shipping for 16 of the 25ah cells is 180. Same weight but I guess fit in a common box better.

[CatNewBee]

Originally Posted by Opie91

This seems almost too good to believe....


https://www.ev-power.eu/Winston-40Ah...b87v3hm18i7mt4

Well this price includes EU VAT, for non-EU citicen, you can buy it for almost 20% less, so shipping might make sense, even if it looks expensive in the first place...

[aquabelle]

In terms of cost, if I do not include the alternator systems, solar charger and panels, and inverter, I was around $4000 USD. Prior to this system I tested and used Firefly Oasis, and loved them as well.[/QUOTE]

Steve....if you don't mind sharing.....what was the. motivation for moving away from Fireflys?