LiFePO4 Battery Basics - Parallel, Series, 48V VS 12V + Bluetooth monitoring!

[@Cowboy_Steve]

Howdy! Math make Cowboy Steve head hurt... 😁 Great refresher because I can rarely remember all the specifics lol. I keep learning it planning to make a power pack I can haul around to work around the property and I never seem to find the time (or the funds) to do it. So I have to keep relearning it 🙄 Something about 'old dog new tricks' 😅 Well done and thanks for sharing 🤠

[@BigFarles]

I missed this video. I’m glad I looked back into last week and found it. Thanks for the information.

[@jmdminiaturehorse63]

Good job on the basic electricity lesson...lol

[@jamescady723]

Much appreciated!

[@byfaithalone3529]

👍

[@mikejbam]

Are LifePo4 batteries the right choice when cycle count will be very low? I'm adding a battery and inverter to my sump pump system. We go years without a power outage, so I just need a battery chemistry that is ok with being charged and almost never discharged. Thanks for the video.

[@SSLFamilyDad]

I would say yes, you will want to add a cheap lifepo4 battery tender to your setup but that should work just fine

[@Valery_751]

Hello When connecting 4 batteries in series to get 48 volts, do you need a BMS?

[@Sylvan_dB]

The "basic math" should also include the units. That's the only thing that most people probably didn't learn when they learned the multiplication tables. 100amp-hours or 100ah simply means 100 X amp X hours, so for an 8 amp load: 100 amp-hours 100 amp hours 25 1 hours ------------------------- = --------- X -------- X --------- = ------ X --- X ---------- = 12.5 hours 8 amp 8 amp 2 1 Oh, and: volt X amp = watt (just a rule...) another is: resistance X amp = volt; with those two you can figure out the current (amps) and voltage at any place in any simple circuit.

[@SSLFamilyDad]

Very good, thank you for adding that!

[@cndbrn7975]

Where did you manage to find the improper fraction 25/2, 100 / 8 = 12.5? I think the "rule" is P = V x I - the other is, V = I x R - where I is (A) or current x resistance. I believe Ohm's Law describes it best in the triangle; V I R

[@Sylvan_dB]

@@cndbrn7975 That's exactly the math. 100 amp-hours, powering an 8 amp load, amp-hours divided by amps gives hours, 100 / 8 gives 12.5, but taken in steps dividing both numerator and denominator by 4 gives 25 / 2 which is of course also 12.5.

[@dreadartist]

Nice video! I'm wondering if say you used the 2 batteries for different purposes so they were at a different state of charge. Could you still just hook them up together in parallel and charge them together, or would that hurt them? In other words, do they have to have a very similar charge to be charged together at the same time with one charger? Thanks in advance 😊

[@SSLFamilyDad]

It is best to charge them both fully before putting them in parallel

[@artmatthew1]

You are coming dangerously close to shorting those 24v leads at 7:45. You might want to mention to be careful..

[@cndbrn7975]

Hey, thanks for the vid. I'm trying to figure out if this configuration would work, for my ebike. I had (6) 12v 20ah lead acid batteries in series, when I bought it, for a 72v 20ah bank. Now I want to put 4 12v 12ah lithium batteries together but this will only be 48v, I need 72v. So, I was thinking of using a 12v lead acid battery, wired to a buck/boost converter, to get me the 24v extra volts. I'd like to get as much capacity from them as well but I'm not sure if this configuration will work? If anyone else has any input, feel free to comment .. You have 4 batteries, there terminals are +/- In a housing like this; B1 B2 B3 B4 You want to connect them in (2) series sets ie; 1, 4 & 2, 3 .. B1- to B4+ B2+ to B3- Now you want to connect these (2) sets together in parallel .. B1+ to B3+ B2- to B4- Will the battery bank with, 4 batteries connected in series & parallel be .. The series voltage: B1 to B4 = 24v B2 to B3 = 24v The parallel ah's: B1, B3, B2, B4 = 48ah Total battery bank with 4 s/p: V = 48 Ah = 48

[@neildriedger637]

👍