02-08-2024, 06:02 AM
|
#1 (permalink)
|
EcoModding Lurker
Join Date: Mar 2021
Location: NC
Posts: 6
Thanks: 1
Thanked 0 Times in 0 Posts
|
16.8v on a 12v starter?
I have a Silverado (5.3L) that I am installing a large 48v electrical system in, to power most belt drive accessories. One of the major things I want to do is get rid of that giant lead battery!
Now, let's say I replace the starter battery with a 4 cell lithium ion battery? That's 16.8v vs 12 or less. It would not power anything else, I don't want 16 volts for anything else. Nothing but starter.
Is this going to damage a typical 12v American style starter motor? I know they sell 14 and 16 volt lead acid batteries for racers, and they claim it works fine, but is that true? It would not be the end of the world, starters are cheap and easy to replace, but I don't want to get stranded somewhere.
I might just try to leave the battery at 16.0v, not quite as hot and that way I don't have to float charge the lithium battery at max voltage.
I could use a 12.6v 3 cell, or 14.4v Lifepo4 batteries instead, but I would like it to crank super fast.
|
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
02-08-2024, 10:25 AM
|
#2 (permalink)
|
Somewhat crazed
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 4,354
Thanks: 526
Thanked 1,187 Times in 1,047 Posts
|
For starters, the spec used to be 14.8v for charging batteries in very cold weather. In theory therefore most electronics should tolerate that and more, but in reality it varies case by case. My glowplug relay which is solid state has a limit of 14.6 stamped on it and I know from experience replacing said relay that 14.7 fails the relay.
The starter will draw more current, spin faster and develop more hp (maybe now 3 1/2). The brushes will arc more and live shorter lives but that shouldn't be noticable. I overvolt my traction motor significantly and know of someone that has doubled his traction system voltages to 400 volts on a 48v rated motor. The trick will be isolating the other systems from the 16 volts and the bemf produced
__________________
casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
|
|
|
The Following User Says Thank You to Piotrsko For This Useful Post:
|
|
02-08-2024, 01:54 PM
|
#3 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,497
Thanks: 8,060
Thanked 8,862 Times in 7,315 Posts
|
Throw in a resistor in series.
__________________
.
.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________
.
.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
|
|
|
02-08-2024, 03:17 PM
|
#4 (permalink)
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,075
Thanks: 1,128
Thanked 584 Times in 463 Posts
|
Quote:
Originally Posted by freebeard
Throw in a resistor in series.
|
And put it in the intake to heat the incoming air.
__________________
|
|
|
02-08-2024, 05:03 PM
|
#5 (permalink)
|
EcoModding Lurker
Join Date: Mar 2021
Location: NC
Posts: 6
Thanks: 1
Thanked 0 Times in 0 Posts
|
Quote:
Originally Posted by Piotrsko
For starters, the spec used to be 14.8v for charging batteries in very cold weather. In theory therefore most electronics should tolerate that and more, but in reality it varies case by case. My glowplug relay which is solid state has a limit of 14.6 stamped on it and I know from experience replacing said relay that 14.7 fails the relay.
The starter will draw more current, spin faster and develop more hp (maybe now 3 1/2). The brushes will arc more and live shorter lives but that shouldn't be noticable. I overvolt my traction motor significantly and know of someone that has doubled his traction system voltages to 400 volts on a 48v rated motor. The trick will be isolating the other systems from the 16 volts and the bemf produced
|
Perfect, just wanted to know it won't instantly let out the magic smoke. I haven't decided entirely how I want to wire it up, but yeah, it will be annoying isolating the voltage everywhere, even the starter solenoid.
The 16v will charge off the main 48v battery and I could adjust the voltage of a 4S pack down by simply by not charging them all the way. Probably smarter in the long run, I'm basically just using the high output batteries like a capacitor, they don't need to hold many watts.
Then to complicate it even more I'll have a 100A 13.8v converter to replace the alternator and power everything else 12v. I could probably use the 16, it just kind of scares me with so many electronics on the engine these days that I don't even understand...
Eventually I'd like to add a motor to the main engine pulley, and be able to use it as a starter/generator...but I'm getting ahead of myself.
|
|
|
02-09-2024, 02:22 PM
|
#6 (permalink)
|
Corporate imperialist
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 11,265
Thanks: 273
Thanked 3,568 Times in 2,832 Posts
|
Run it, you won't hurt it.
Race cars have ran 7 cell lead acid batteries for ever.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
|
|
|
|