AndroBlaze:


So I was pretty surprised to see the comments from your trail on the question "can lithium batteries start conventional cars" as I just assumed most people knew this was possible and took it as a given, probably because I am a bit of a youtube freak and the first time I came across normal sized 12v lithium batteries, it was people testing them with cars.

Anyway after seeing your comments and going back to youtube to dig up the videos, I was actually quite surprised that it took a bit of time and there weren't as many videos of people doing so, I mean not like the way I remembered it.

[b]However addressing your questions, it seems even if the BMS is rated 100Amps, that won't stop it from delivering far more in the milliseconds it takes for it to start your alternator (see video 1). But to be on the safe side as shown in the last video, its probably safer for you to use LIFEPO4 batteries that are designed exactly for the purpose of acting as cranking batteries.

The comments of the other youtubers on the videos is actually the highlight if you ask me, as it shows you people have been doing this for years and the workarounds they've found effective. [/b]

That's interesting, didn't know that.


So now the bigger issue is setting up the right charging parameters and dealing with the thermals of an engine bay.

AndroBlaze:
DIY custom built lifepo4 car battery ( made it 4 years ago, has used it on 3 different cars and claims he bought the BMS for only $9 ! )


https://www.youtube.com/watch?v=HEd5FkGnljQ?si=nwBt6ylV2qpfyqrg

This is nuts and looks a lot more straightforward than I expected.

Just a simple 4S7P setup making 17.5Ah (but with 30C instantaneous discharge). Says his alternator didn't have any issues charging it either.

Game-changing!

AndroBlaze:
DIY custom built lifepo4 car battery ( made it 4 years ago, has used it on 3 different cars and claims he bought the BMS for only $9 ! )


https://www.youtube.com/watch?v=HEd5FkGnljQ?si=nwBt6ylV2qpfyqrg

This hits a memory lane.
In 2023 I was about to make a 3 day journey, car battery started craze. Then I had a 40amp diy LifePO4 built for emergency. I had no choice than to test run with it. It worked!!! But I didn't charge with it as the alternator charging current was around 30a or so. Since I must travelled, I decided not to charge with it after starting the car by disconnecting the terminals. So it was strictly to start the car only. Had to drive without the battery connected. Not easy though, because whenever I park the car, I must open it to reconnect, start, disconnect and drive. Na desperate measures oo ..

N.B: No be everything be fire fire. If the above oyinbo was a Nairaland YouTuber, he will be castigated for installing cells in a wooden box. YouTube is not a standard, do your thing with safety even if nobody had done it before. Certain things can't just be said here. Peace!

dollarnaira:


This hits a memory lane.
In 2023 I was about to make a 3 day journey, car battery started craze. Then I had a 40amp diy LifePO4 built for emergency. I had no choice than to test run with it. It worked!!! But I didn't charge with it as the alternator charging current was around 30a or so. Since I must travelled, I decided not to charge with it after starting the car by disconnecting the terminals. So it was strictly to start the car only. Had to drive without the battery connected. Not easy though, because whenever I park the car, I must open it to reconnect, start, disconnect and drive. Na desperate measures oo ..

N.B: No be everything be fire fire. If the above oyinbo was a Nairaland YouTuber, he will be castigated for installing cells in a wooden box. YouTube is not a standard, do your thing with safety even if nobody had done it before. Certain things can't just be said here. Peace!

A wooden box is exactly what you need if it's going to stay in the engine bay. Wood is a better insulator.

Surely a BMS allows you to regulate charging current?

Decentlyproud:
Riio sunII 3kva 24v. I think it's version1

This is what I use currently

Good afternoon everyone

My Haier thermocool inverter freezer rated for 100watts consumes around 100watts whenever I put in on but as time goes on, the consumption can rise to as high as 320watts.

What could likely be the problem?

Happy Weekend

Please what brand of panel btw 400 - 450w would you recommend for someone staying in Benin City, fouani does not have that size and then Cworth is not readily available in Benin. Please what panel brand can i go for? Thanks for the reply

Dharyhor:
Good afternoon everyone

My Haier thermocool inverter freezer rated for 100watts consumes around 100watts whenever I put in on but as time goes on, the consumption can rise to as high as 320watts.

What could likely be the problem?

did you put hot food inside of your fridge?, most fridges goes high above their rated capacity when the inside temperature goes higher than normal.

favouredbymercy:
Happy Weekend

Please what brand of panel btw 400 - 450w would you recommend for someone staying in Benin City, fouani does not have that size and then Cworth is not readily available in Benin. Please what panel brand can i go for? Thanks for the reply

have somebody in lagos purchase Cworth 420w panels and ship down to you.

fuckboys:
have somebody in lagos purchase Cworth 420w panels and ship down to you.

Is shipping few numbers of fragile item as such, not be an issue?

Thanks for your reply

fuckboys:
did you put hot food inside of your fridge?, most fridges goes high above their rated capacity when the inside temperature goes higher than normal.

No bro

It happens almost every time, it'll initially be consuming 100watts then goes up as time goes on

Same here my car uses a 75ah battery but with a higher crankimg amps which led to the batteries I've bought for prematurely.

I've watched videos of people that achieved using lithium on their cars.

1 used a generic 300A BSM with a n 800A peak power, while the other person used 2 Daly BMS in parallel to achieve his.

However, I discovered that to actually achieve this you have to use the power LFP cells and not the normal ESS cells as the power cells have up to 5C discharge rate.

HeavenlyBang:


Same here.

I've used 75aH batteries rated at 600A crank to start my car, so I'm guessing I need somewhere around that.

My research shows Lifepo4 can handle that instantaneous current discharge, but like you said the bottleneck will be the BMS. You can run it directly without a BMS, but then you risk overcharging considering how alternators work.

Ideally, we'd need a 50-75aH battery, a BMS that can handle 600A without tripping, and potentially fan for cooling so the battery doesn't overheat in the engine bay (or place the battery in the trunk and wire it from there).

I measured my battery voltage with my alternator running this evening and it was at 14.2-14.4v. Lifepo4 can handle that.

The big issue is the BMS.

I've also seen people suggest using supercapacitors to handle the high instantaneous current needed when cranking the engine, then the capacitors get refilled by the battery. That would eliminate the need for a high C BMS, I believe.

Interesting project imo.

This is not actually note true.

There are car batteries that are made of LFP cells.

You can check Amazon and some of the other online stores to confirm.

CuteMaro:

Lifepo4 batteries are not recommended for this purpose due to extreme temperatures and fire risk. I hope it's worth it.

Gurus, any idea or experience about HENZ POWER brand of solar inverter?

Can this actually power 1hp inverter air-conditioner?

ManAdii:

This is what I use currently

Decentlyproud:
Can this actually power 1hp inverter air-conditioner?

Guy, you wan insult this inverter?
Something wey I dy use iron and microwave at the same time. Traditional Philips iron of 1.2KW and panasonic microwave.

What is 1hp of 0.75KW. Highest the surge can be 2KW on start up.

You should be concerned about your battery bank.

favouredbymercy:
Happy Weekend

Please what brand of panel btw 400 - 450w would you recommend for someone staying in Benin City, fouani does not have that size and then Cworth is not readily available in Benin. Please what panel brand can i go for? Thanks for the reply

Contact @kristen

Hehehehe...I am not underrating it o.just wanted to be sure.

We don't have much team tbb here, I guess

ManAdii:

Guy, you wan insult this inverter?
Something wey I dy use iron and microwave at the same time. Traditional Philips iron of 1.2KW and panasonic microwave.

What is 1hp of 0.75KW. Highest the surge can be 2KW on start up.

You should be concerned about your battery bank.

Felicity dry cell batteries available in unit and bulk at good price.
Call or WhatsApp me on 09116033581 to place your orders.

Dharyhor:
Good afternoon everyone

My Haier thermocool inverter freezer rated for 100watts consumes around 100watts whenever I put in on but as time goes on, the consumption can rise to as high as 320watts.

What could likely be the problem?

This happened to me. I always wondered how my battery drained so fast, till I monitored it and discovered.

It will only maintain that 100w if the contents are already frozen. If you just load it, while working, power consumption will jump to like ×2 or ×3

Thank you for the videos they were very helpful and informative.

AndroBlaze:
Proper lifepo4 cranking batteries


https://www.youtube.com/watch?v=Mms05lZEYkA?si=BRVuvh4CFoRdLoFM


https://www.youtube.com/watch?v=YNz7BcBvCrU?si=1T0PwN5diQ-L3qJb

Valentinooo:


This happened to me. I always wondered how my battery drained so fast, till I monitored it and discovered.

It will only maintain that 100w if the contents are already frozen. If you just load it, while working, power consumption will jump to like ×2 or ×3

So can we say it's normal and that nothing is wrong with the freezer?

Fully installed!

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AndroBlaze:


To be honest I admire your attitude and the way you have taken everyone's contribution on your matter.

I think within the one year period you have given yourself to upgrade to lithium you will learn a lot. The thing you have going for you is that lithium batteries will probably be cheaper in a year's time and Lead's value will probably keep going up, which means the secondhand value of your batteries will still be ok as scrap (BTW I am measuring in dollars and not our pitiful currency).

Keep it up and try and keep this board updated on your journey. In maybe 2 years time you'll understand why we all advised you the way we did and you'll probably be doing the same with a newbie that comes to you asking a similar question.

Also, have you tried the AC yet? Interested to know if your setup successfully carried it.

Yeah it runs AC so well. The AC power is 980w - 1kw. THANKS

Happy weekend Gurus. Has anyone used GROVOLT inverter? What would you say about their 1.5kva hybrid inverter

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Please who know how to set charging parameters for welion inverter to charge lithium batteries the battery is 10kwh sms

Please i need your assistance on this

toscotech:
Please who know how to set charging parameters for welion inverter to charge lithium batteries the battery is 10kwh sms

Please i need your assistance on this

Set as user defined. I think option 05 in the settings menu

Then set float and buck to 56.5 I think option 27&28

Then set your low battery cutoff option 29.


Please use manual to confirm what I typed above...

I noticed my inverter starts beeping and eventually turns off when there is little sunlight for as low as just 10 minutes (when gate and compound lights are on). When tv and fan is also on, it starts beeping in as low as just 2 minutes and then goes off. In a nut shell, e wan be like na when sun dey blaze e dey function well.

Then after careful thought, I decided to disconnect the MPPT charge controller and connect the batteries and solar wires directly by bypassing the charge controller. Omo rain fell for 2 hours and I still had light with TV , fan and every every on. If it was before, the inverter for don off coz there is little sunlight. What could be the issue and what could be wrong? I'm a novice on solar energy but it seems like the charge controller is not allowing the batteries to charge properly. That's what I'm thinking.


Is this also a good or bad decision?