Fan won't run on 27.5 Volt LI battery...

[zirx]

New to the game. I toot on a build for my own adventure and can't really find out what I need to know about the battery I have. It's a lithium ion, built form me by a local solar enthusiast. It reads 27.5 volts just sitting there.

Do I have to step that down somehow to run 12 volt things? Reason I ask, is the Maxxair fan I have won't run on it, but it runs fine on a standard liq. acid 12 V bat I had lying around.

The led lights I installed seem to work fine with the LI battery...

Any help/ideas...am I just being dumb and not knowing a standard component? The charge controller is reading A-OK and my inverter is working fine. It's just the fan.

thanks

 

[zirx]

(I didn't "toot" on a build...I "took" on a build!

 

[bullfrog]

The battery is probably set up to be nominally for a 24 volt system would be my guess. Yes you will have to modify your battery or system to run 12 volt appliances. I wouldn’t be surprised if it burned up or damaged your fan if it was hooked up directly. Be very careful not to short out lithium batteries.

 

[zirx]

fan still works...on a 12 volt system...hmmmmmm. I wonder what the coponent is that steps it down.

 

[abnorm]

Buck Boost transformer

 

[Camper]

I use a similar converter on my fan and it works fine for me.

Step down converter:

Input voltage: 24V（18V-32V）, Output:12V /10A


https://www.amazon.com/EPBOWPT-Conv...ep+down+transformer+24v&qid=1665524294&sr=8-1

 

[zirx]

Thanks! I ordered one.

 

[rruff]

Thanks! I ordered one.

Make sure you get one that will supply all your 12v loads, just for simplicity. Also, get things that will run on 24v if possible. Wiring losses are cut by 4x vs 12v.

Many options: https://www.amazon.com/s?k=24v+to+1...12v+step+d,aps,212&ref=nb_sb_ss_ts-doa-p_1_17