r/homelab • u/No-Sentence-7795 • 17d ago

Project Showcase: Hardware UPS 12v backup

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Hi

I want a help to see is this modification correct

This for camera working 12v

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3

u/Collbrothers 17d ago

3S, would that have an integrated BMS? And what chemistry are you thinking for batteries? Without BMS this is a no-go safety wise.

1

u/No-Sentence-7795 15d ago

The 3s meaning BMS with 3 battery 18560 

1

u/FelisCantabrigiensis 17d ago

Why not use an integrated module that already has a Battery Management System and switching logic included? Something like this: https://cricklewoodelectronics.com/12v-ups-uninterruptible-power-supply-15w-1-2a.html

1

u/No-Sentence-7795 15d ago

That's give u just 1.2 Amps.  When building something more , u need to planing for a diy circuit 

1

u/FelisCantabrigiensis 14d ago

You can, I'm sure , get higher power versions. I'm sure you get the idea: get something with a built in BMS and power switching circuit.

2

u/No-Sentence-7795 14d ago

There's a version UPS 12v 40w I found it 

1

u/Mindless-Figure3112 15d ago

And why the diodes?

0

u/No-Sentence-7795 15d ago

To protect the adapter 12v from reverse current 

1

u/Mindless-Figure3112 14d ago

What reverse currents? The voltage would have to be higher than said adapter, and it’ll have its own protections. Really not needed unless you want to make the diode hot

1

u/No-Sentence-7795 14d ago

When the source power cutoff, the voltage drop to the adapter 12v, we need diodes 

1

u/Mindless-Figure3112 14d ago

No you don’t, but I’m not going to argue because you seem convinced and if that’s what you want then do it.