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 2:11 pm

Actually running 4 gauge from the front to the back will actually protect the cars converter better as it won't allow the amp to pull as much from the front, sort of limiting the power, but only under very high draw situations.

Yes I would ground the battery at the rear, neg to ground as well.

Is the amp 12 vdc?
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
@82k miles - 58.98Ahr - 90SOH - 87.70Hx - 256GID

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 2:19 pm

yes 12v dc can accept 14.4v to.

ok only 4 gauge in beetween my the batterie. and 0 gauge in the back for the amp to the rear battery.

i will post some other pics tomorow im making the box now.

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 4:47 pm

patatewz wrote: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?
No. When a large demand hits the extra battery the extra battery provides the power. The fuse will not open.
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 5:38 pm

ok but when the fuse will blow? never?

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 5:50 pm

Hopefully never. You would likely need a short leading to the back battery or maybe past the back battery to blow the fuse.

Speaking of fuses you should have one on the positive side leaving the front battery and one on the positive side of the back battery leading to the front. Then a last one as it leaves the back battery for the amp itself. So three fuses, the reason being if the line from the front battery shorted to ground, it would blow the front fuse, but the back battery would still be shorted to ground, and that is bad, so there needs to be a fuse on each end of that line.
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
@82k miles - 58.98Ahr - 90SOH - 87.70Hx - 256GID

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 8:20 pm

patatewz wrote:ok but when the fuse will blow? never?
Probably never. The primary purpose for the fuse is to protect the wire not any other component. Actually as you have a power source at each end you should have a fuse at each end. The fuse is for a wiring fault such as short to ground.
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 8:57 pm

ok thanks i will do that.

a big thanks to all this good information.

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?

Tue Dec 04, 2018 11:41 am

Image

Where its safe to connect my 12V+ 4 gauge wire for my amplifier? At the #1 or #2. I know we have a sensor at the 12v+ to see curent draw... but i dont know where its best to connect to not mess with that sensor...

thanks.

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?

Tue Dec 04, 2018 12:03 pm

You would want to connect it directly to the battery, that way the converter can see the load and adjust accordingly.
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
@82k miles - 58.98Ahr - 90SOH - 87.70Hx - 256GID

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?

Tue Dec 04, 2018 12:19 pm

i just find in a other post, the hall sensor is on the neg terminal of the batery. So its important to not connect anything on the neg pole of the battery.

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