I am in the end stages of putting everything together to complete my first build. I need a little reassurance on how to wire everything together. This is what I am working with…
I am still in need of a Charging Port and Charger. Open to any recommendations?!
Here are some pics to help show what I am working with…
A couple of the issues that have come up…
-Not sure how to connect my the motors hall sensors? It seems like the spot they get plugged into the FOCBOX are not the right size.
-From the Battery I have a XT90 and the FOCBOX has XT60. Can I solder a XT60 Female onto the XT90 to make them connect or is this a no no?
Two things that I am really stuck on is how to wire the BMS on this setup? And How to wire in the charge port (still need to order one, any recommendations? Also need to order the actual charger.)
Good point on the xt60. Should be simple enough to do.
Can you elaborate in the balance leads? Would that be the smaller wires (+,-) coming from the battery?
I had @eboosted make the battery for me. He marked on the bms which end goes where (big dot, small dot). Would any of these include the balance leads? See Pics…
I agree with Ryan, change the battery connector to an xt60 - then you could just connect the Unity straight to the battery, bypassing the BMS (for simplicity).
You are definitely going to want to run your charging circuit through the BMS though. It looks like there’s a balance lead loom attached to your battery. Don’t plug this into the BMS just yet, but can you tell if it is a match for the white plug on the BMS? I’m guessing whoever made your battery supplied the BMS, so it probably is a match.
Before you plug it in though, you need to connect B- on the BMS to the negative terminal of the battery, and CH- to the negative on your charge port of choice. I just used a DC power plug - but I recommend going with a plastic body one to reduce the chance of accidental shorts.
For the positive lead to the charge port, this connects straight to the positive terminal of the battery - but I recommend adding a 10A fuse in line. I use the glass cylinder ones.
You can use a thinner gauge wire for charging, I think I used 18AWG, but you could go thinner.
EDIT: cool, the balance leads should be straightforward
I suppose if you don’t want to unwrap the battery, and you’re already taking off the xt90 plug, you could splice the charging circuit onto the battery power leads.
https:///collections/battery-chargers/products/12s-4a-battery-charger
https:///collections/battery-chargers/products/12s-2a-battery-charger
These are your best bets, Build Kit Boards has one but they are out of stock.
Thanks for all the help guys! I ran into one more issue. The charge port has 3 prongs. I know the odd looking one at the top is for the negative from the BMS, but what do I do with the other 2? Which one is the positive of the 2 remaining? @Eboosted
Maximum battery discharge on the Samsung 30Q and 12s5p is 75A specified and 100A if you want to push the batteries to the max. I’d personally use 100A and have used that on all my boards.
@Eboosted I’m having trouble getting the board to charge. Is there a way I can trouble shoot this? I would guess that it has to do with the way I have the charge port wired…not sure.