why i call Li fussy

pianotuna wrote:
Tom,

Show me a bms that allows a draw of 240 amps from a 100 amp-hour battery?

My future bank will allow 9600 amps. Not that I'll ever use that amount of current.

Your needs certainly are out of the ordinary. I have a 170ah Renogy drop-in lithium with built in BMS that I purchased two years ago from Walmart for $970 plus tax. I'm never in a situation where the battery temp will drop below 32F. I have 400 watts of solar and in two years may have run my generator 6 times to charge my battery after a couple of cloudy days. This does not include times that I run the generator to use my microwave or A/C. I don't have to do anything to the system. About the only thing I have to do is turn my inverter on when needing 120 volt power.

pianotuna wrote:
time2roll do you have a link to a 300?

What happens if you have 3 100 amp-hour Li in parallel? Can they reliably provide 1 c each to yield 300 amps? My guess is that there would have to be carefully balanced wiring. (which should be in place anyway).

https://www.aliexpress.com/item/1005002205134036.html?

Most of these larger units are built on 280 Ah cells. Maybe 2 or 3 in parallel using copper or aluminum bus bar for the assembly. If going 4+ probably best to break it into two or more batteries with their own BMS for each.

So a battery assembled with 8x 280 Ah cells as 2p4s could go 500 amps. Although 200 would be better. Due to the very low resistance (<3 mOhm) it does not seem LFP has the balance issues of lead-acid. The BMS keeps the assembled cells in balance.

3 tons,

He is a man who has found a way to make money.

time2roll do you have a link to a 300?

What happens if you have 3 100 amp-hour Li in parallel? Can they reliably provide 1 c each to yield 300 amps? My guess is that there would have to be carefully balanced wiring. (which should be in place anyway).

3 tons wrote:
Who the heck is Will Prouse??…Whether he’s correct or not (??), can anybody please tell me who Will Prouse is, and how he might be credentialed??…I cant fault his entrepreneurship, but from my perspective his evaluations and conclusions, many of which often seem half-baked (in the end leaving me more puzzled than when I started…) are superficial…Not my source of choice.

3 tons

I have also wondered why he is treated as some sort of expert? As far as a I can tell his credential is being good at social media and self promotion.

pianotuna wrote:
Tom,

Show me a bms that allows a draw of 240 amps from a 100 amp-hour battery?

My future bank will allow 9600 amps. Not that I'll ever use that amount of current.

I am not sure why this would be a metric you would be interested in, but here you go:
250A BMS

Now tell me how much capacity you would get from your 100Ah battery at 240A?

Who the heck is Will Prouse??…Whether he’s correct or not (??), can anybody please tell me who Will Prouse is, and how he might be credentialed??…I cant fault his entrepreneurship, but from my perspective his evaluations and conclusions, many of which often seem half-baked (in the end leaving me more puzzled than when I started…) are superficial…Not my source of choice.

3 tons

RLS7201 wrote:
The cost is outrageous.

Up front, yeah. If you can afford them, they're wonderful.

pianotuna wrote:
Tom,

Show me a bms that allows a draw of 240 amps from a 100 amp-hour battery?

My future bank will allow 9600 amps. Not that I'll ever use that amount of current.

You can buy a 300 amp BMS and strap it onto a 100 Ah battery. I don't recommend it. The cell manufacturer would recommend about 100 max with 50 as more realistic.

Easy to create unrealistic expectations. 9600 amps... give it a rest.

Why the need to prove LFP is so bad? Actually works well for many people.

I still don't get it, with Li batteries.
The cost is outrageous.
They don't tolerate the cold. My wet cell deep cycle batteries live behind my front bumper and have worked perfectly down to -15F.
Additional devices must be purchased and added into the charging system. I.E. BMS, DC to DC chargers, etc.
4 100 amp GC batteries cost about $400 and last me 5-6 years. That's less than $100 a year for batteries.
We spend the winter months near Quartzsite on BLM property with 500 watts of solar. generator only runs for microwave and hair dryer.
Yeah, Li batteries charge faster, thus the DC-DC charger to protect the alternator. They weight less but that's not an issue for my coach.
For the additional cost of Li batteries, I wouldn't get any more service.
Flack jacket on

Richard