Voltage required to wake

[MrNatural22]

Never have had a reason to wake a sleeping 12v lifepo BMS but a distant neighbor ran his 100ah lifepo down to where the BMS did its job and shut down the battery. (32" TV and inverter on all night ) States he tried a lead acid 12v battery to wake up the the BMS but did nothing. \
no charger available. My thoughts are lifepo is 13.6v so one would need at least that or higher to wake the BMS which a LA battery can't supply.
I suggested using jumper cables from a running vehicle to quickly reawake the BMS. Good idea or bad idea?
Never had a reason to reawaken any of my batteries as i monitor them closely.
Any and all input on this is appreciated.

 

[sunshine_eggo]

The voltage needs to be above the BMS resume voltage, and that may vary from BMS to BMS.

I'd try the jumper cables.

 

[v_green57]

Maybe a DC-DC boost converter:

https://www.amazon.com/HiLetgo-Adjustable-Step-Up-Constant-Converter/dp/B07T137H2Y

 

[MrNatural22]

The voltage needs to be above the BMS resume voltage, and that may vary from BMS to BMS.

I'd try the jumper cables.

Thanks Steve.
I told him jumper cables from a running vehicle then once its awake a good 12hrs of sun back on his 325watt 60v solar panel thru an MPPT (battery connect first of course then connect solar panel ) to charge back up to near full. And buy a proper plug in lifepo charger for those dark times. AND buy a damn voltmeter, even a cheepy $4 H Freight one.
He thinks he's plugged into his house and can run that 1500w inverter and that big tv all night.
Doesn't understand solar capabilities and consumption on a 100ah battery yet.
BUT that's how we all learned by making assumptions and sometimes expensive mistakes.

 

[HarryN]

Usually the part that people forget is the need to first take the voltage down to essentially zero. In other words - disconnect it from everything else with a breaker, switch or removing a wire.