Good Sam Club Open Roads Forum: Tech Issues: lifepo4 and maxxfan
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

 > lifepo4 and maxxfan

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Next
mdkelley

Michigan

New Member

Joined: 07/03/2021

View Profile


Offline
Posted: 07/03/21 09:26am Link  |  Quote  |  Print  |  Notify Moderator

Hello,

I am new here. I didn't see a new member introduction so I will do that quickly before posting my question.

Matt from Michigan. I have a 1989 pop top 8' skamper on a 2004 2500 duramax. So far I have installed a MaxxAir fan, one LiFePO4 battleborn with a power dynamics Li single stage converter/charger, and removed the non-functioning 3 way fridge and am putting a 5000btu AC unit in that space. I also purchased a 2200 honda generator to use for off-grid battery charging and running the tiny AC unit. This camper follows a van conversion camper the wife and I used for about 4 years. Also installing a WiFi ranger and have a wilson cell booster. That pretty much rounds out my rig introduction.

My question: Will my power dynamics 45 amp LiFePO4 controller burn out my MaxxAir fan? I ask because I think it did! So, on to question2. If that is true (too much voltage to run a fan) what regulator do other use to get around this issue? I wired the converter in to my system to act as shore power and have a quick disconnect to put the battery into the system when not on shore power or if I need to charge the battery. I figured there is no reason to constantly charge the battery if I am on shore power. I am not sure if I need to get a 12v regulator that is rated at 45 or more amps since that is the output of the converter, or if the regulator's amperage rating is more for amp draw and not really an amp input rating. I would think maybe a regulator from a truck may work since an alternator usually puts out more than 45 amps but looking for some guidance from someone who has done this already so I can avoid any implementation headaches (learning curve).

Thanks,

Matt Kelley
Michigan

Matt_Colie

Southeast Michigan

Senior Member

Joined: 10/09/2011

View Profile


Offline
Posted: 07/03/21 10:40am Link  |  Quote  |  Print  |  Notify Moderator

Matt,

Welcome and thank you for trying to supply enough information.

You called the converter "power dynamics". Did you mean "Progressive Dynamics" from Marshall MI?

If it is a PD unit, it did not burn out your fan.

If it is a PD unit, just set the connections to the battery and forget the rest. Those guys do their homework.

If this is not the case all bets are off.

Matt - another from SE Mi


Matt & Mary Colie
A sailor, his bride and their black dog (one is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.


Grit dog

Black Diamond, WA

Senior Member

Joined: 05/06/2013

View Profile


Offline
Posted: 07/03/21 11:20am Link  |  Quote  |  Print  |  Notify Moderator

Welcome and yes thank you for the detailed explanation.
Refreshing in a forum that a lot of “Wut iS wRoNg??” type questions are asked.
Short answer is have you measured voltage output to your DC fuse panel and at the fan? What is it?

The battery isn’t the issue. With normal fla batts at a nominal 12.6V output fully charged and lifrpo4 at 12.8, this is a nonissue. IMO
Pulling off shore power through the converter, voltage may be/is higher, assuming here but haven’t tested, but again this is a normal scenario.
Could the fan just be defective?
What leads you to believe it’s too high of voltage?


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

wopachop

Who run bartertown

Senior Member

Joined: 11/17/2006

View Profile


Offline
Posted: 07/03/21 11:22am Link  |  Quote  |  Print  |  Notify Moderator

2 Matts from Michigan!! You guys should be at redbud right now!!!! (making jokes)

What voltage did your fan get? Just like cars and dirt bikes all the 12v stuff is able to get 14v and not burn out. No need for a regulator. But you can find them cheap on ebay. I use them for other stuff. Many have a little potentiometer that you turn with a screwdriver to adjust the output voltage to whatever you want.

mdkelley

Michigan

New Member

Joined: 07/03/2021

View Profile


Offline
Posted: 07/03/21 01:15pm Link  |  Quote  |  Print  |  Notify Moderator

Yes progressive dynamics from Marshall mi. Getting older and my memory is slipping ??.The voltage at the fan connector was 14.2 if I remember correctly, I will recheck when I get home. I read online some said maxx air told them anything over 13.6 would fry the circuit board. I emailed maxx air today and am awaiting a response.

Just thought maybe it was the higher voltage since the fan worked with a regular lead battery when it was installed in a few weeks ago. I will connect it directly to that FLA battery to see it it works with that. I tried it with just the BB lifepo4 battery and then just the converter and neither worked. If no one runs a voltage regulator with the high volt output lifepo4 charger/converter and a maxxfan then it must be something else going on. Also, the lights all work fine, even the one on the circuit that feeds the fan.

wopachop

Who run bartertown

Senior Member

Joined: 11/17/2006

View Profile


Offline
Posted: 07/03/21 01:36pm Link  |  Quote  |  Print  |  Notify Moderator

mdkelley wrote:

Also, the lights all work fine, even the one on the circuit that feeds the fan.
Ah then something came loose with the fan wiring. You definitely have 12v feeding the fan?

mdkelley

Michigan

New Member

Joined: 07/03/2021

View Profile


Offline
Posted: 07/03/21 02:10pm Link  |  Quote  |  Print  |  Notify Moderator

Yeah, I pulled that light and wiring and checked voltage at the fan connector and tested the fan before I stuffed the wiring back into the ceiling, it still didn't work.I can check the voltage at the circuit board as well but doubt there is any issue with the wiring.

BFL13

Victoria, BC

Senior Member

Joined: 02/15/2006

View Profile



Posted: 07/03/21 02:57pm Link  |  Quote  |  Print  |  Notify Moderator

Those fans have their own fuse up in the fan area you might have blown. (one version has a pop-out glass fuse)

One version has a rocker switch for fan direction. If that is in the middle with no direction selected the fan will not run.

You only need a converter, forget the regulator idea. If it is not too late you might want to return that one for their two-stage version. The original one-stage like you got was a mistake, where they thought an LFP could float on 14.x for an extended time, or else they expected you to not float the LFP at all.

Your plan to disconnect the battery when on shore power should be ok though. Just remember to do that if you will be on shore power for a long time. If you got the two-stage it would drop to 13.6 and float the LFP safely so you would not need to disconnect it.

* This post was last edited 07/03/21 03:16pm by BFL13 *   View edit history


1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

wa8yxm

Davison Michigan (East of Flint)

Senior Member

Joined: 07/04/2006

View Profile


Offline
Posted: 07/03/21 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

The specifications for charging a BB Battery Bulk/absorb = 14.2 – 14.6 Volt, with 14.4 Volt ideal. That is the same as the Progressive lead Acid bulk charge voltage That is the highest voltage the system should produce at any time.

Most converters output between 14.4 and 14.6 in Boost/Bulk mode.


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


pianotuna

Regina, SK, Canada

Senior Member

Joined: 12/18/2004

View Profile


Offline
Posted: 07/03/21 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

.

* This post was edited 07/05/21 03:27pm by pianotuna *


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Next

Open Roads Forum  >  Tech Issues

 > lifepo4 and maxxfan
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:




© 2022 CWI, Inc. © 2022 Good Sam Enterprises, LLC. All Rights Reserved.