Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
New
#1
Hi guys / girls

New to this site so hello all, and very new to the solar/wind battery energy systems total noob, looking to save a few pounds in the future on electricity bills, as a noob i know the cost of getting everything will more than likely make it at first more expensive than saving but i do like a challenge and learning new things, everyday is a school day.

So i have started to build a few packs as proof of conception im hoping to run maybe my upstairs of house lights and maybe upstairs ring main not a lot of load but i won't be able to gather much solar energy to start with.

So to the basics the size of my packs are they 4P10S, forgive the soldering never done it before i used 1 amp glass fuses on the positive side and the on the negative side the legs off the 1 amp fuse.




Reply
#2
Welcome!

Solder isn't to bad, I've seen worse. But practice makes them better Wink

Do you mean 4s10p? Or are you trying to run 36V strings?

However, that pack is wired up as 1s40p.

3s/4s is kinda 12V, but not really
7s is pretty close for 24V
10s would be for 36V
14s is good for 48V
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
Reply
#3
Hi and welcome.

What you have assembled there looks like a 1s40p.

This is the same pack size that I am using in 14s strings. As Korishan said above I have 48V nominal batteries.

And yes practice will make perfect.

How many packs have you built so far?
Are the total capacities of each pack equal to each other?
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply
#4
Hi

I have soldered 2 and about 6 more ready to be soldered, i was going to make 12v battery but reading on here i think now run series upto 24v for better use of the packs. The 12v idea was mainly for availability of inverters etc and there reasonable prices.

Capacity of the cells are all between 1700mah to 2000mah, the 2 soldered packs have been done for about a week and the voltage has stayed at 4.15v.

1s40p ah i was getting confused because of the 4 rows forgetting that there are as 1 everyday a school day.
Reply
#5
Hi, just a couple of tips, cut and twist your bus bars to the final position where you will connect the plugs or you will break the fuses when you'll do it.

I think you need more mass on the welder, the bus bar disipate a lot of heat and you have the solder like in bubbles, if the  copper of bus bar get enough hot the solder will spread, and for doing that without melting the holders you need a solder with more mass to transfer the heat in less time.

That brings me to the next, on the positive side of the pack, left botton side of the picture, probably you started soldering there, the holders are melted, and the busbar is sunken, maybe the wrap of the cells may be afected too, this busbar is positive and this part of cells are negative, and the busbar car be making contact with cells just the thin wrap is separating them, so it can make a shortcircuit, I will check this holder and ensure that are separated enough. 

Reply
#6
Thanks for the tips, never soldered before so all tips/advice welcome. And should of planned the busbar ends good point.
Reply
#7
(01-20-2019, 08:37 AM)Richard Wrote: Hi

I have soldered 2 and about 6 more ready to be soldered, i was going to make 12v battery but reading on here i think now run series upto 24v for better use of the packs. The 12v idea was mainly for availability of inverters etc and there reasonable prices.

Capacity of the cells are all between 1700mah to 2000mah, the 2 soldered packs have been done for about a week and the voltage has stayed at 4.15v.

1s40p ah i was getting confused because of the 4 rows forgetting that there are as 1 everyday a school day.

Have you matched the pack capacities? It's fine to mix different cell mAh's when connected in parallel (the same pack) however you will need to balance the pack capacities when connected in series (all packs need to be the same total mAh's).
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply
#8
Is it best to use the repacker tool for that.
Reply
#9
Yeah, I think so, most of the users here used it.

Otherwise it's very tedious, calculating everything by hand Big Grin
Reply
#10
(01-20-2019, 02:18 PM)Richard Wrote: Is it best to use the repacker tool for that.

Yes

I used it like most of us here. All my packs are all to within a few mAh's of each other.
I saved all my cell capacities to a spread sheet as I tested my cells, once I had enough cells good to go I cut and paste the results into the repacker.
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply


Who read this thread?
33 User(s) read this thread:
hbpowerwall, daromer, mike, Korishan, PAF, wim, watts-on, jesusangel, Geek, Charly144, djuro, raul_ap, mbrunton, Redpacket, choncy12, Walde, Riplash, chuckp, Chass90, Dirty Optics, Wolf, jeffl98, PaulDane, TimBelgium, kevinjaye, shiftyphil, LEDSchlucker, zoookii, Richard, sukhvirbhai83, i-craft, Edster, kronos

Forum Jump:


Users browsing this thread: 1 Guest(s)