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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🛡️ Elevate your battery game with smart, safe, and balanced power protection!

SMART SAFETY SUITE - Integrated overcharge, over-discharge, over-current, and short circuit defenses keep your system stable.
BALANCED BRILLIANCE - Ensures every cell charges evenly for peak performance and longevity.
HIGH CURRENT HANDLING - Supports up to 100A continuous and 150A instant discharge—built for power users.
POWERHOUSE PROTECTION - Safeguard your battery pack with explosion and fire prevention tech.
PLUG PLAY COMPATIBILITY - Designed specifically for 4-series 12V LiFePO4 batteries with easy wiring for seamless integration.

The Walfront LiFePO4 Battery Protection Board is a robust BMS designed for 4-series 12V lithium iron phosphate batteries. It delivers continuous 100A discharge current with instant peaks up to 150A, featuring comprehensive protections against overcharge, over-discharge, over-current, and short circuits. Its balancing function extends battery life by ensuring uniform cell voltage, all within a compact 50g package built to operate reliably from -30°C to 80°C.

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