curiouscarbon
Science Penguin
- Joined
- Jun 29, 2020
- Messages
- 3,027
darkwing duck references on solar forum? hell yeah
What heating mats did you use?I overbuilt this guy using dead tree carcus. Since it's in a room that isn't heated I insulated it and have a heating mat under both the batteries. I'll be adding to it as time goes on. Working well so far!
COOL!
it would do fine..I’d like to hear more from someone who bought a used server rack (say a Dell rack) and put at least 3 EG4 batteries in… how did you modify to support the weight? How did you add appropriate bus bar? How did you do your cabling?
I am considering a used server rack and would like to know if anyone else has done it. Pictures always helpful too.
Be interested to see the cable management approach you end up with.So far I have a couple of these, gonna get 4 stud ones to connect to two inverters.
I bought a trough. But I have read not to mix DC and AC wires in them. So I guess I need to come up with a way to separate them?Be interested to see the cable management approach you end up with.
This:What heating mats did you use?
Be interested to see the cable management approach you end up with.
Here's a thread recent thread about bus bars and fusing that may offer you some useful nuggets.I am making three banks of five 48V 100Ah batteries. Parallel connections between batteries in a bank of one foot in length, 2/0 cable. And banks to bus bar also 2/0 eight feet of equal lengths.
The main reson that racks are so expensive, is that they are made of metal which does NOT burn.I overbuilt this guy using dead tree carcus. Since it's in a room that isn't heated I insulated it and have a heating mat under both the batteries. I'll be adding to it as time goes on. Working well so far!
I would try think about at least two different situations for sizing the wiring and laying out the bus bar arrangements and choosing the appropriate parts. Normal vs. bypassing a battery that's acting up until you can remedy the issue.Then from bus bar to bus bar below two 15k Sol-Arks, 4/0 or two 2/0?
Something has gone wrong with one of your three batteries.
600 amps / 2 battery banks = ~300 amps that each bank needs to supply.
Of course it would likely be a rare occurrence but it's good practice to size and fuse your wire like you are.I believe the BMS limits the batteries to 50A discharge. So 250A per bank.
Of course, my load with never be as high as what the Sol-Arks can produce, unless I do something crazy like get EVs!
I didn't build this because server racks are expensive?? I'm aware wood burns. Everyone in the DIY space is aware of the risks involved. I don't get what the point of your comment is.The main reson that racks are so expensive, is that they are made of metal which does NOT burn.
I would try think about at least two different situations for sizing the wiring and laying out the bus bar arrangements and choosing the appropriate parts. Normal vs. bypassing a battery that's acting up until you can remedy the issue.
If everything is working normally you've got two 15k inverters sharing the output of three 500 Ah (5x100Ah) batteries, right?
In very round numbers here's some food for thought. Maybe you've already done all this math, if so, this is just an exercise I'm playing around with out of my own curiosity.
Normal:
30,000 watts / 51V = ~600 amps that the entire battery bank needs to supply. Can the bus bar you've chosen handle 600 amps?
600 amps / 3 battery banks = ~200 amps that each bank needs to supply
Something has gone wrong with one of your three batteries.
600 amps / 2 battery banks = ~300 amps that each bank needs to supply.
I better just leave it there as hopefully the smart people will be along soon to offer more detailed advice and I've got to get to work.
Cheers!