Can this handle charging through the negative output instead of the charging negative pad?

You can't really do this, because you lose the charging protection. Essentially you will be able to charge at whatever the full output is... since you're using the same mosfets. I've tested this personally on this unit, and similarly-priced models from other vendors. It's a shame, because I'm trying to use this with an alternator and I am starting to think BMS is not possible. I will have to get a charge management controller.

It specifies charge voltage of 15v. can i use an 18v dc? will it regulate it for proper charging voltage and current? thanks.

Hello~ You cannot use an 18 v dc, it's higher than 15 v, and may cause damage to the protection. It means that the max charging voltage is 15 v. Hope this could help you, and thank you for your support!

how to wire up the separate port BMS to solar charge controller? Is there diagram?

solar positive and battery positive go together on the battery and solar ground goes to battery charge ground on the bms

Hello, each of my four 12v 12ah lifepo4 batteries already have individual internal bms protection. would adding this unit make any sense? thx

It depends on you, and this protection circuit board helps protecting battery pack from overcharging, over-discharging over-current and short circuit. and it is designed with equilibrium function to keep each cell in balance and good service life.

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12V 100A 4Series BMS Protection Board with Balancing with Overcharge/Overdischarge/Overcurrent/Short Circuit Protection for LiFePO4 Battery Pack

Product ID: 47156062

Details

Battery Cell Composition
Lithium Ion
Brand
Walfront
Item Weight
0.05 Kilograms
Manufacturer
Walfront
UPC
736691475918
Vehicle Service Type
For LiFePO4

⚡100A max current handling

🔋12V, 4-series LiFePO4 compatibility

🛡️Multi-layer protection suite

114.48 DT

Duties & taxes included

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Battery Cell Composition
Lithium Ion
Brand
Walfront
Item Weight
0.05 Kilograms

Description

🛡️ Power up smart, stay protected smarter!

POWERHOUSE PROTECTION - Safeguards your LiFePO4 battery pack from overcharge, overdischarge, overcurrent, and short circuits—because your energy deserves elite defense.
PLUG PLAY CONVENIENCE - Comes with a 5P-250mm wire for seamless installation—get your system up and running without the hassle.
PRECISION CELL BALANCING - Equilibrium function ensures each cell stays perfectly balanced, extending battery life and maximizing performance.
COMPACT WATERPROOF DESIGN - Durable build that fits discreetly into your setup and withstands environmental challenges—engineered for the modern professional.
RELIABLE CONTINUOUS OPERATION - Supports charging and discharging simultaneously, proven to handle steady 40A loads with ease for your daily power needs.

This 12V 100A 4-series BMS board is a must-have for LiFePO4 battery packs, delivering comprehensive multi-protection and cell balancing to enhance battery longevity and safety. Designed for easy installation and reliable continuous use, it’s the trusted core component that keeps your energy system efficient and secure.

Specifications

ASIN	B07511RJ9S
Battery Cell Composition	Lithium Ion
Battery Type	Lithium Ion
Best Sellers Rank	#270,046 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,127 in Power Converters
Brand	Walfront
Brand Name	Walfront
Compatible with Vehicle Type	For LiFePO4 Battery Pack
Customer Reviews	3.7 out of 5 stars 154 Reviews
Item Weight	0.05 Kilograms
Manufacturer	Walfront
Manufacturer Part Number	Walfrontvth9zscx12
Model Number	4330198367
UPC	736691475918
Vehicle Service Type	For LiFePO4 Battery Pack
Voltage	12 Volts, 3.2 Volts

Reviews

S**R

28.05.2018

M**E

28.12.2024

E**S

7.04.2024

T**E

25.07.2019

R**D

10.09.2023

R**D

17.07.2021

A**N

18.07.2025

O**E

11.11.2023

A**ー

20.02.2025

B**Y

12.12.2025

J**.

25.03.2019

R**O

9.11.2022

V**A

1.08.2020

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