Hello everyone electrical question here.
I currently have a jap spec 1996 hdj81 land cruiser with 24 volts starting 12 volts running.
I am wanting to convert it to run at 12v all the time with Lifepo4 cells (lithium battery) charging straight from the alternator.
Now I would like to take out the 24v starter system and run it all at 12v but my question is whether I need to buy a new starter or not, my current one is 24v 4500 watts and the 12v equivalent is 2500 watts that the Australian market got. What I need to know is whether the 24v starter will have enough grunt at 12v to start the truck. I won't be starting it in super cold weather maybe -3 will be absolute worse but most of the winter it won't be in the negatives. I tend to leave camp after 10.00 am
Another consideration is the Lifepo4 cells I'm using has a max current draw of 1360 amps and don't have much voltage sag, unlike the lead-acid batteries. If I was drawing let's say 300 amps my voltage will only sag as low as 13v whereas you'll need a very good lead-acid battery bank to sag above 11v at that current.
Currently, my 24v starter draws 190 amps at 11v per battery. If the voltage was now 13v from the Lifepo4 cells would the amps increase to accommodate the drop in voltage to maintain starting capacity. I don't think it will need the full 4500 watts just the standard 2500watt starter capacity I would imagine will be sufficient as it seems to start instantly now, don't mind it turning over once or twice.
My other concern is if it has the torque to run at 12v will it have the speed to get the engine up to a starting RPM.
and lastly, if it won't work what is the difference to allow the 2500 watt one to work.
I currently have a jap spec 1996 hdj81 land cruiser with 24 volts starting 12 volts running.
I am wanting to convert it to run at 12v all the time with Lifepo4 cells (lithium battery) charging straight from the alternator.
Now I would like to take out the 24v starter system and run it all at 12v but my question is whether I need to buy a new starter or not, my current one is 24v 4500 watts and the 12v equivalent is 2500 watts that the Australian market got. What I need to know is whether the 24v starter will have enough grunt at 12v to start the truck. I won't be starting it in super cold weather maybe -3 will be absolute worse but most of the winter it won't be in the negatives. I tend to leave camp after 10.00 am
Another consideration is the Lifepo4 cells I'm using has a max current draw of 1360 amps and don't have much voltage sag, unlike the lead-acid batteries. If I was drawing let's say 300 amps my voltage will only sag as low as 13v whereas you'll need a very good lead-acid battery bank to sag above 11v at that current.
Currently, my 24v starter draws 190 amps at 11v per battery. If the voltage was now 13v from the Lifepo4 cells would the amps increase to accommodate the drop in voltage to maintain starting capacity. I don't think it will need the full 4500 watts just the standard 2500watt starter capacity I would imagine will be sufficient as it seems to start instantly now, don't mind it turning over once or twice.
My other concern is if it has the torque to run at 12v will it have the speed to get the engine up to a starting RPM.
and lastly, if it won't work what is the difference to allow the 2500 watt one to work.