patatewz
Posts: 18
Joined: Tue Dec 01, 2015 8:54 am
Delivery Date: 01 Dec 2015

BIG amp install maximun current draw for the dc/dc converter?

Sat Dec 01, 2018 3:16 pm

can i use a 150 amp fuse on the 12v+ with a 0 gauge wire to power a big sub amp or i will fry my dc/dc converter?

i read somewhere the dc/dc converter can provide 135 amp... so if i draw more than that whats happen?

thanks a lot and sorry for my english im french.

BrockWI
Posts: 758
Joined: Fri Mar 28, 2014 6:28 am
Delivery Date: 28 Mar 2014
Leaf Number: 423875
Location: Green Bay, WI.
Contact: Website

Re: BIG amp install maximun current draw for the dc/dc converter?

Sat Dec 01, 2018 5:51 pm

Yes you should fuse it at 150 amps and when you say converter, do you mean inverter? Is it sine wave or mod- sine wave? What kind of sub are you trying to power that pulls 1000+ watts continuous?
3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 200k miles - 52 mpg lifetime
EVSE level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@90k miles - 54.71Ahr - 83.64SOH - 78.44Hx - 237GID

patatewz
Posts: 18
Joined: Tue Dec 01, 2015 8:54 am
Delivery Date: 01 Dec 2015

Re: BIG amp install maximun current draw for the dc/dc converter?

Sat Dec 01, 2018 9:48 pm

very big 18 inch sub... i talk about the dc/dccconverter from the leaf to feed the 12v current... i think it can handle only 135 amp so if i use a audio amplifier of 150 amp maybe i will blow my dc/dc leaf converter?

patatewz
Posts: 18
Joined: Tue Dec 01, 2015 8:54 am
Delivery Date: 01 Dec 2015

Re: BIG amp install maximun current draw for the dc/dc converter?

Sun Dec 02, 2018 10:25 am

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smkettner
Posts: 7355
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: BIG amp install maximun current draw for the dc/dc converter?

Sun Dec 02, 2018 11:18 am

I would have a separate battery to power the amp so as to absorb the surge power.
LEAF DC-DC converter can keep the extra battery topped off when you are not busting your eardrums.
Lots of people use Optima batteries as a buffer in these stereo systems.
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
RAV4 traded in for I-Pace Dec 2018

patatewz
Posts: 18
Joined: Tue Dec 01, 2015 8:54 am
Delivery Date: 01 Dec 2015

Re: BIG amp install maximun current draw for the dc/dc converter?

Sun Dec 02, 2018 11:21 am

yea i have a yellow top primary batterie but how i connect a second batterie? and how the seconde battery will protect my dcdc converter?

smkettner
Posts: 7355
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: BIG amp install maximun current draw for the dc/dc converter?

Sun Dec 02, 2018 11:28 am

The resistance in the wire will prevent surging overload from being transmitted to the DC-DC converter. When running at max power the second battery will be basically powering the amp and the DC-DC converter providing a steady charge without overload.

Use a smaller wire such as #6 and maybe an 80 amp fuse. This will create a voltage drop during excessive load and restrict power to the second battery to a safe level. Still plenty of power to keep the second battery charged on a daily basis. I assume the second Optima would be in the rear of the vehicle or close to the amp.
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
RAV4 traded in for I-Pace Dec 2018

patatewz
Posts: 18
Joined: Tue Dec 01, 2015 8:54 am
Delivery Date: 01 Dec 2015

Re: BIG amp install maximun current draw for the dc/dc converter?

Sun Dec 02, 2018 12:22 pm

just to be clear the second battery in my trunk with a 80amp fuse between the mainbattery and the second? and i plug my amp at the rear? and when a big surge will come, the 80 amp fuse will blow to protect my dcdc converter?

BrockWI
Posts: 758
Joined: Fri Mar 28, 2014 6:28 am
Delivery Date: 28 Mar 2014
Leaf Number: 423875
Location: Green Bay, WI.
Contact: Website

Re: BIG amp install maximun current draw for the dc/dc converter?

Sun Dec 02, 2018 12:32 pm

In the end yes the fuse will protect the Leaf's DC-DC, but what is really protecting it is the battery up front, the lines running to the back and then primarily the rear battery. All these will reduce surge on the DC-DC converter. I honestly doubt that sub will pull more than 100w continuous unless your pumping white noise through it, sure it might surge to close to 1000w but in short bursts for milliseconds.

One way to think of it is the main DC-DC converter is a supply or hose of running water (water being power) and the first battery is a tank and the "hose" leading to the second battery as another tank. All the main DC-DC has to do is re-fill those tanks, the instant surge will be pulled from the closest battery or "tank" to the amp and will then slowly refill.

I am not sure what size you will run from the front to the back, but even at 4 gauge, unless you dead short it (that's what the fuse is for) you shouldn't hurt the car. Just remember to leave the car on, if you manage to run the 12v dead you won't be able to restart it.
3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 200k miles - 52 mpg lifetime
EVSE level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@90k miles - 54.71Ahr - 83.64SOH - 78.44Hx - 237GID

patatewz
Posts: 18
Joined: Tue Dec 01, 2015 8:54 am
Delivery Date: 01 Dec 2015

Re: BIG amp install maximun current draw for the dc/dc converter?

Sun Dec 02, 2018 1:19 pm

wow your helping me a lot!

ok i will run 0 gauge wire from 12v+ and 12v- from the feont to the rear. with a fuse at 100 amp in front.

i will plug my amplier at the rear 12v+ and 12v- at on the body of the leaf.

do i need to ground the 12v- in the back to the body of the leaf?

and i will use a 5000w rms amp the sub is a special sub y can handle 10 000w burst.... so you tell me i can run a very big amp in the back and its only the rear batt it will suffer and no big urge draw in the front and on the dc dc converter thats correct?

thanks for your help its amazing!

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