RV.Net Open Roads Forum: Truck Campers: Moving LiFePo4, Rewire or run Long Extensions?

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Truck Campers

Open Roads Forum  >  Truck Campers

 > Moving LiFePo4, Rewire or run Long Extensions?

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Prev
Sponsored By:
PastorCharlie

NC

Senior Member

Joined: 03/28/2004

View Profile





Offline
Posted: 12/28/20 06:43pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

PastorCharlie wrote:

When installing my system I used 4/0 welding cable with equal runs connecting 4 batteries ( 450 ah ) and a 2,000 watt Magnum inverter. Fuse the + at battery. All terminals are both crimped and soldered. Estimate your needed run and buy the cable in one piece and cut to desired lengths. Simple and minimizes loss.

4/0? OMG, why?
Presume you had it laying around and then thus more economical than buying adequate but much smaller cable?


Less resistance and will deliver whatever ah I need and is available to use. No hot wires. I called local welding supply and they delivered. Adequate is like operating a truck at its max....its adequate.

My philosophy is, if I go cheap doing for myself I cannot complain because I know who stuck it to me.

Grit dog

Black Diamond, WA

Senior Member

Joined: 05/06/2013

View Profile


Offline
Posted: 12/29/20 09:11am Link  |  Quote  |  Print  |  Notify Moderator

^Like I said, no harm, no foul. I’m sue your setup works great.
It’s just not necessary to use wire that size.
Starter motor on a diesel pickup pulls 450+ amps through 2/0 wire, for comparison.

More so posted for others who don’t have the knowledge, that they do not think 4/0 welding cable is required for this setup.
Cheers
Happy New Years !

* This post was edited 12/29/20 11:06am by Grit dog *


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29

StirCrazy

Kamloops, BC, Canada

Senior Member

Joined: 07/16/2003

View Profile



Posted: 12/29/20 05:36pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

^Like I said, no harm, no foul. I’m sue your setup works great.
It’s just not necessary to use wire that size.
Starter motor on a diesel pickup pulls 450+ amps through 2/0 wire, for comparison.

More so posted for others who don’t have the knowledge, that they do not think 4/0 welding cable is required for this setup.
Cheers
Happy New Years !


wow, I dont know if I would use 4/0 for anything but welding haha. I dont have a situation where I have to carry 400plus amps up to 30 feet away. but ya if you got it use it...


Steve


2014 F350 6.7 Platinum
2016 Cougar 330RBK

Camp woof

California

Full Member

Joined: 08/26/2014

View Profile


Offline
Posted: 01/05/21 12:17pm Link  |  Quote  |  Print  |  Notify Moderator

I have a Bigfoot 10.4 with 2 Lifeblue lithiums. Just stuffing a small blanket inside the door takes care of most of my issues. Started to use that blankie for the dog, so now will use facon heating pads, only if I need to charge and the batts are 40 or below. With blanket and cabinet doors open, will have to be quite cold outside air. Been down to teens at night and daytime high of 33, but moved after 1 day!

phemens

Montreal, Canada

Senior Member

Joined: 09/18/2006

View Profile


Offline
Posted: 01/06/21 05:56am Link  |  Quote  |  Print  |  Notify Moderator

[quote=StirCrazy][quote=Grit dog]^Like I said, no harm, no foul. I’m sue your setup works great.
It’s just not necessary to use wire that size.
Starter motor on a diesel pickup pulls 450+ amps through 2/0 wire, for comparison.

More so posted for others who don’t have the knowledge, that they do not think 4/0 welding cable is required for this setup.
Cheers
Happy New Years !

wow, I dont know if I would use 4/0 for anything but welding haha. I dont have a situation where I have to carry 400plus amps up to 30 feet away. but ya if you got it use it.


Every wire gauge calculator I've tried recommended 4/0 cable for my setup, and my lengths are nowhere near 30ft. From the battery bank to the bus bars is 3ft, and from the bus bars to the 3000 W inverter is 5ft. At 300 amps for a couple of minutes (say running the microwave), those wires heat up fast. I'm not going to gamble an expensive set of batteries for a couple of bucks.


2012 Dutchman Denali 324LBS behind a 2006 Ford F-250 V10 out of Montreal
1 DW, 1 DD, 1 DS, 2 HD (Hyper Dogs)
1200w solar, 600AH LIFePO4, Yamaha EF2000 gen, Samlex 3000w Inverter

otrfun

On The Road

Senior Member

Joined: 09/08/2012

View Profile



Good Sam RV Club Member


Posted: 01/06/21 07:56am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

My mistake, by much smaller, I meant couple sizes (which is considerably smaller diameter and cost).
A 2000W inverter will draw approx 200A at full load.
I also assumed a relatively short wire run, under 10’. With that 1/0 would be more than sufficient and 2/0 would be conservative.
No harm in overkill on wire size. ( Just like pickup trucks, right? Lol). Just not necessary for the load from a 2000W inverter unless it’s a long run. Which would make no sense as it’s far more efficient to have the DC load close to the power source and distribute with AC current to AC loads.
IMO one should strive for =<2% of voltage drop (while under maximum load) to get maximum productivity from the inverter and battery. Higher voltage drops reduce the number of AH you can access from the battery, and thus the inverter's runtime.

If you used 4/0 cable for a 2000w inverter (while under a maximum load of ~200a), the longest cable run you could use and still maintain a 2% voltage drop would be 12 ft. This would drop to 8 ft. with 2/0 cable and 6 ft. with 1/0.

c.traveler2

Moreno Valley,Ca.

Senior Member

Joined: 09/04/2004

View Profile



Good Sam RV Club Member

Offline
Posted: 01/24/21 06:34pm Link  |  Quote  |  Print  |  Notify Moderator

Bert the Welder wrote:

Just saw a LiFePo battery that has a warmer built in. It seems to kick on first, before putting the juice to the cells. Once warm, the BMS lets the charge go through. CanBat was the company. Canadian, eh.....


You lose about 20% of you power when that heater kicks in for the battery...check Battle Born website.


2007 F-250 4x4 /6.0 PSD/ext cab/ 2020 Bunduvry

Lance 815/ 85 watts solar panel (sold)
2020 Bunduvry by BundutecUSA

Travelingman2 Photo Website
Truck Camper Trip Reports 3.0
travelingman21000 YouTube Videos
Alex and Julie's Travels Blog


c.traveler2

Moreno Valley,Ca.

Senior Member

Joined: 09/04/2004

View Profile



Good Sam RV Club Member

Offline
Posted: 01/24/21 06:42pm Link  |  Quote  |  Print  |  Notify Moderator

RickLight wrote:

Yeah we can get off track easily.

Sounds like the big question is how much better will the solar be with shorter wires? Longer 120 is not a factor under 50'.

Plan exclusively for the future 400W system. Then do your voltage drop calculations for both ways. https://www.southwire.com/calculator-vdrop At 10' 6AWG is probably good, but 4 will be half the loss. What can't be calculated is the value of your cash and sweat.

Moving LI batteries inside is a no brainer for me, if you plan on any cool temps. I've been snowed on in mid summer! There are heaters for batteries but that takes time with the truck noise, fuel and fuss.


I have a dual Lithium (Battle Born 100Ah) set and they are separated by about 6 feet. I have run 4guage wire so there not a problem with voltage dropped (I checked it). I also have 320 watts of solar that is managed by a single combi unit...Renogy DC50s DC-DC MPPT charger/controller, it's been very reliable...Renogy

StirCrazy

Kamloops, BC, Canada

Senior Member

Joined: 07/16/2003

View Profile



Posted: 01/24/21 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

phemens wrote:




Every wire gauge calculator I've tried recommended 4/0 cable for my setup, and my lengths are nowhere near 30ft. From the battery bank to the bus bars is 3ft, and from the bus bars to the 3000 W inverter is 5ft. At 300 amps for a couple of minutes (say running the microwave), those wires heat up fast. I'm not going to gamble an expensive set of batteries for a couple of bucks.


no harm in going bigger but for a money vs preformance issue (for some one that dosent have 4/0 laying around to use( I would have just used 0 gauge to the bussbar then at 5 feet 2 gage would be more than enough for the 5 feet. for some one buying the wire they will probaby save 70% with out sacarficing any preformance.

Steve

wintersun

Monterey

Senior Member

Joined: 12/22/2011

View Profile


Offline
Posted: 01/25/21 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

Electricity is not a good source for heating anything. I got by for weeks with a single 100AH AGM battery and two 100W solar panels by using the battery to power the propane fridge controller and the fan for the propane furnace. We made coffee in a drip percolator on one of the cooktop burners. If we had needed to heat food it was with the propane cooktop and this would apply to baby formula as well.

If you don't want to change our camping lifestyle then the option is to add a generator to your rig and run it in the morning to recharge your battery and at night to heat the RV or stay in parks with shore power (best option overall).

We survived in comfort with temperatures in the teens and with our propane furnace as the heat source which was fine as the cubic feet of air to heat was half that of a bedroom and that was with an uninsulated camper. Better to warm the living space then to use electric blankets.

With the exception of a special low temp Relion battery the lithium batteries will not charge at temperatures below freezing or 32 degrees. You could add a 12v warming pad around the battery but I would put this at the bottom of the list of changes to make.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 4  
Prev

Open Roads Forum  >  Truck Campers

 > Moving LiFePo4, Rewire or run Long Extensions?
Search:   Advanced Search

Search only in Truck Campers


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.