RV.Net Open Roads Forum: Tech Issues: 2004 Cat C7 Charging LifePo4 battery bank

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 Tech Issues

Open Roads Forum  >  Tech Issues

 > 2004 Cat C7 Charging LifePo4 battery bank

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Sponsored By:
map40

Florida

Senior Member

Joined: 01/15/2005

View Profile



Posted: 03/03/21 12:52pm Link  |  Quote  |  Print  |  Notify Moderator

I am upgrading my battery bank to a hell of a lot of capacity (Around 1200 amps). I know that if this was a gasser, the alternator will die young if it has to charge the bank. How good is the alternator in the Caterpillar? Will it take sustain maximun capacity constant? Otherwise I need to find a way to regulate power or connect and disconnect the banlk ontermitently.
Thanks!


Alfa SeeYa
Life rocks when your home rolls

Matt_Colie

Southeast Michigan

Senior Member

Joined: 10/09/2011

View Profile


Offline
Posted: 03/03/21 01:11pm Link  |  Quote  |  Print  |  Notify Moderator

Map40,

I wish I could help more, but I am currently still in the research phase for a client. There are available DC-DC chargers that both create the correct final voltage for charging LiFePo4 batteries and limit the charge current drawn from the source. It is a single unit. There also should be a BMS Battery Management System with the Li unit to keep it from hurting itself or others. As said, this is a study in process on my part.

Matt


Matt & Mary Colie
A sailor, his bride and their black dogs going to see some dry places that have Geocaches in a coach made the year we married.


map40

Florida

Senior Member

Joined: 01/15/2005

View Profile



Posted: 03/03/21 01:21pm Link  |  Quote  |  Print  |  Notify Moderator

Matt_Colie wrote:

Map40,

I wish I could help more, but I am currently still in the research phase for a client. There are available DC-DC chargers that both create the correct final voltage for charging LiFePo4 batteries and limit the charge current drawn from the source. It is a single unit. There also should be a BMS Battery Management System with the Li unit to keep it from hurting itself or others. As said, this is a study in process on my part.

Matt

Thanks for the reply Matt. I got that part covered. The batteries are managed by their own BMS which can charge them dirvectly from the alternator feed. All of that works and so far I have 340 amps installed and they work great. My concern is: Will the alternator take the workload? The old Lead acid setup was 300 amps to recharge in the worst case, but when you talk about 1200 amps, the alternator will NEVER rest. Wil it last?

Lwiddis

Monterey, California

Senior Member

Joined: 08/12/2016

View Profile



Good Sam RV Club Member

Offline
Posted: 03/03/21 01:24pm Link  |  Quote  |  Print  |  Notify Moderator

Running any vehicle alternator at max or near max for long periods won’t work IMO. Weren’t built for that level of service.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watt solar-parallel & MPPT, Trojan T-125s. TALL flag pole. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist14 yr. Army vet-11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


2oldman

NM

Senior Member

Joined: 04/15/2001

View Profile


Online
Posted: 03/03/21 01:55pm Link  |  Quote  |  Print  |  Notify Moderator

The charging rate will likely be determined by the size of the charging wire. Congrats on the 1200ah.

CA Traveler

The Western States

Senior Member

Joined: 01/03/2004

View Profile


Offline
Posted: 03/03/21 02:16pm Link  |  Quote  |  Print  |  Notify Moderator

Not an expert but there have been prior posts that typically alternators will not sustian their maximum ratings without damage which is basically what you want with that amount of Ah.

But not sure what you mean by 1200A - Are you planning for 1200 Ah?

Suggest you get the model number and contact the mfg.


2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland

Bob


map40

Florida

Senior Member

Joined: 01/15/2005

View Profile



Posted: 03/03/21 03:04pm Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

Not an expert but there have been prior posts that typically alternators will not sustian their maximum ratings without damage which is basically what you want with that amount of Ah.

But not sure what you mean by 1200A - Are you planning for 1200 Ah?

Suggest you get the model number and contact the mfg.

Well, by 1200 amps I meant 1200 usable amps. 6 280 amps batteries. 15kw in the 12v system. I also have 28kw in a 48V system to run all the 110-220 with a split phase.
This 12v battery bank will be for storing the solar and running the 12V side of the house. If needed, I can run 110V through the inverter (which I might be upgrading to a low frequency inverter so I can run ACs with the 12v batteries).
I have a 6kw inverter generator that I can use to recharge both banks at a 90% efficiency, if I ever need it, wich I don{t believe I ever will.
I am getting rid of my diesel generator. I am done with the smell, noise, maintenance and ineficiency. With what I get from selling the generators I can do all of this and more.
Now I have to find a way to control the flow from the alternator or install a timer on the batteries so the charge intermitently.

2oldman

NM

Senior Member

Joined: 04/15/2001

View Profile


Online
Posted: 03/03/21 03:08pm Link  |  Quote  |  Print  |  Notify Moderator

I think CA is referring to the designation of amp-hours, not amps. Running ACs with 12v is going to require some big cabling. I think I'd prefer doing that with the 48v side.

MEXICOWANDERER

las peñas, michoacan, mexico

Senior Member

Joined: 06/01/2007

View Profile


Offline
Posted: 03/03/21 04:06pm Link  |  Quote  |  Print  |  Notify Moderator

6?" or 8?/¹?" alternators can sustain 100% load.
Google DELCO, MOTOROLA, LEECE NEVILLE IMAGES and state which one you have.

SV K

Varied

New Member

Joined: 12/01/2020

View Profile



Good Sam RV Club Member


Posted: 03/03/21 04:10pm Link  |  Quote  |  Print  |  Notify Moderator

Is your alternator air or oil cooled?

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Tech Issues

 > 2004 Cat C7 Charging LifePo4 battery bank
Search:   Advanced Search

Search only in Tech Issues


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.