sparklehunt
New Member
- Joined
- Aug 19, 2021
- Messages
- 42
QUESTION: Anyone know/try if the ubiquitous 4s/12v BMS (from JiaBaiDa brand, xiaoxiang, china mfg, etc) can handle being placed (4x) SERIES to 48V battery bank?
MORE INFO:
I would be using (3x) VICTRON BATTERY BALANCER ($65 ea) to go in between each pair of 12V batteries I make.
+ lead ---- 12V batt w/ 4s BMS --victron-- 12V batt w/ 4s BMS --victron-- 12V batt w/ 4s BMS --victron-- 12V batt w/ 4s BMS ---- minus lead
POSTULATION: it works
POTENTIAL ISSUE: when any bms DISCONNECT triggers (last failsafe, the charger and loads will have limits configured within the BMS limits), it would see a full VOLTAGE of 48V across it's mosfet/whatever method of disconnecting it utilizes (by the way is this really true? does the voltage travel through the load when the current stops). Please note this is similar to putting all-in-one/drop-in 12V packs (like BattleBorn) in series which is COMMONLY done and even suggested by them. Of course they use the BATTERY BALANCER too.
PRIOR / RELATED THREADS
WHY? My THOUGHT PROCESS....
Sourcing good, affordable 16S BMS is hard; either expensive, bad reviews, or OOS/sketch ordering.
Overkill Solar backordered
REC/Orion/Batrium/ $500+ minimum.
Affordable Chargery/Daly/Ant are from China (I get anxious about shipping from China). Chargery has threads about their issues like accurate SoC, etc a couple months ago, not sure if fixed. Daly has threads about smoking when not approaching their limits.
For the 4s bms though, seems WIDELY AVAILABLE and RELIABLE (bigger market perhaps?). Also they are PROGRAMMABLE. Oh and I forgot AFFORDABLE. and many youtube vids prove they function as advertised. For example Battery Hookup says theirs are in medical equipment and COSTS $40 in their package. So I THOUGHT: how can I use this BMS for my purposes. Btw COST wise is 4*$40 (4s bms) + 3*$65 (battery balancer) = $340 vs $500+.
Also this is my FIRST battery bank, it would be ADVANTAGEOUS to be able to RECONFIGURE with 12V and 24V system if I want. Of course I will balance them before reconstructing.
EXTRA QUESTIONS if you are feeling generous
what BMS does Battleborn use? In Will Prowse's teardown, the bms looks very similar. Could it possibly come from same manufacturer?
thank you for your assistance in advance.
edit: updated some links and grammar
MORE INFO:
I would be using (3x) VICTRON BATTERY BALANCER ($65 ea) to go in between each pair of 12V batteries I make.
+ lead ---- 12V batt w/ 4s BMS --victron-- 12V batt w/ 4s BMS --victron-- 12V batt w/ 4s BMS --victron-- 12V batt w/ 4s BMS ---- minus lead
POSTULATION: it works
POTENTIAL ISSUE: when any bms DISCONNECT triggers (last failsafe, the charger and loads will have limits configured within the BMS limits), it would see a full VOLTAGE of 48V across it's mosfet/whatever method of disconnecting it utilizes (by the way is this really true? does the voltage travel through the load when the current stops). Please note this is similar to putting all-in-one/drop-in 12V packs (like BattleBorn) in series which is COMMONLY done and even suggested by them. Of course they use the BATTERY BALANCER too.
PRIOR / RELATED THREADS
BMSs in series?
Hi, I’m so happy I found this forum. I didn’t know how much I didn’t know. I plan on powering a small boat with a 35A / 24v fixed pod motor using 8, 280ah LifePO4s. The cells have to be in 2 seperate packs (4s 12v) Should I put a 4s BMS in each pack or use one 8s BMS which will require...
diysolarforum.com
Connecting two battery banks for 48v in series
Currently I have two banks of lifepo4 24v each with 300AH with respective BMS connected in parallel. It is running fine at 24v. Now I want to run 48v system using same battery banks and connect them in series. Is there any problem with the connection as each battry bank has its own BMS...
diysolarforum.com
JBD / Overkill BMS 120A 4S Lifepo4 in series / parallel
Have you tried it (or anyone else on here)? I can't think of a reason it wouldn't work, I just find it odd overkill would say its not recommended. Other battery manufacturers (battle born) also don't seem to like putting their systems into series the reason you could do 2 in series like in a...
diysolarforum.com
WHY? My THOUGHT PROCESS....
Sourcing good, affordable 16S BMS is hard; either expensive, bad reviews, or OOS/sketch ordering.
Overkill Solar backordered
REC/Orion/Batrium/ $500+ minimum.
Affordable Chargery/Daly/Ant are from China (I get anxious about shipping from China). Chargery has threads about their issues like accurate SoC, etc a couple months ago, not sure if fixed. Daly has threads about smoking when not approaching their limits.
For the 4s bms though, seems WIDELY AVAILABLE and RELIABLE (bigger market perhaps?). Also they are PROGRAMMABLE. Oh and I forgot AFFORDABLE. and many youtube vids prove they function as advertised. For example Battery Hookup says theirs are in medical equipment and COSTS $40 in their package. So I THOUGHT: how can I use this BMS for my purposes. Btw COST wise is 4*$40 (4s bms) + 3*$65 (battery balancer) = $340 vs $500+.
Also this is my FIRST battery bank, it would be ADVANTAGEOUS to be able to RECONFIGURE with 12V and 24V system if I want. Of course I will balance them before reconstructing.
EXTRA QUESTIONS if you are feeling generous
what BMS does Battleborn use? In Will Prowse's teardown, the bms looks very similar. Could it possibly come from same manufacturer?
thank you for your assistance in advance.
edit: updated some links and grammar
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