RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
 
 


Reply
 
Thread Tools Display Modes
 
Old 10-13-2020, 11:56 PM   #21
New Member
 
Join Date: Apr 2016
Location: Florida
Posts: 10
Default

Quote:
Originally Posted by jakegw2 View Post
TaxWonk - thank you for this writeup, your system is very thorough.

Two items that I thought of when reading:

Your DC-DC charger might not be doing any limiting of current since 60A is probably more current than your alternator has to spare, after feeding the chassis load, much of the time when you are driving. Your alternator (probably a 160A unit?) may be running flat-out when you are charging. My 220A alternator supplies between 65A and 85A when driving, depending on what else is running (it supplies as much as 120A at startup for a few minutes). I do not use a DC-DC charger. I don't know if the Sterling device lets you set a max current, but if it does you might consider dropping it to 30-40A so that the alternator does not run at max load.

The charger will still raise the charge voltage slightly to accommodate the LiFEPo chemistry, which can be important if you seldom charge off of other sources (LiFEPo needs the higher voltage to balance the cells - not all the time, but periodically to protect the battery).

You have capacity to power the AC if you wish. Based on my experience with two Battleborn batteries and a slightly more powerful AC I estimate you could get 2.5 to 2.75 hours of AC off your setup. You may not need it, but in FL it is really nice to be able to go shopping or in to eat at a restaurant and come out to a comfortable vehicle. Also great for rest breaks without having to idle the van.
Hi Jakegw2,
According to the RoadTrek owners manual I have a 150amp alternator. The charger does have a half power mode and I think if you want to really get into the coding you can set the max charge amperage. Interesting that you say to cut the charging amperage back to 30A. So far I have not seen it charge any higher than 30A according to my battery monitor. But you make a good point and I think I will set it to half power just to make everything last longer.

As for the AC, I had not originally intended to install a mciroaire soft start and I knew that the Mutliplus could not handle the starting amps so I wired it to not run the AC on battery. I thought it was a good feature for someone using my wife's van that did not understand the system. But now that I have the soft start I might go back to having the AC supply back in the main panel.

Thanks!
__________________

TaxWonk is offline   Reply With Quote
Old 10-19-2020, 05:58 AM   #22
Platinum Member
 
Join Date: Jun 2017
Location: Oregon, Washington, Arizona and California
Posts: 146
Default Si Diode

Quote:
Originally Posted by TaxWonk View Post

3. Maxxair Fan - Maxxair fans do not like anything over 13.9 volts and we would be charging at 14.6 volts so I installed a voltage regulator on the 12v supply to keep the fan control board from burning out.

Hope this helps someone.

A silicon diode in series with your fan will drop the voltage about 0.65 Volts. While it's not a regulator, it's easier to install and probably more reliable. Just make sure the diode has a current rating greater than the maximum current of the fan, and make sure it's not a schottky diode (they have a lower forward voltage drop).
__________________

Nic7320 is online now   Reply With Quote
Old 10-19-2020, 12:56 PM   #23
Platinum Member
 
Join Date: Jun 2017
Location: Calif
Posts: 147
Default

Quote:
Originally Posted by jakegw2 View Post
I found at least one person on the Promaster forum that swapped the factory 180A for a factory 220A and says it is working fine.

https://www.promasterforum.com/threa...od-idea.83639/
Thanks for information!
Rlum is offline   Reply With Quote
Old 10-23-2020, 04:02 AM   #24
New Member
 
Join Date: Jun 2020
Location: CA
Posts: 4
Default

if u want ur batterys to last dont slam them at 14.6 try 14.4 lower is longer life
u dont need to boil them .thats why they swell ...over charging and they heat up
midi459 is offline   Reply With Quote
Old 10-23-2020, 12:28 PM   #25
Platinum Member
 
Join Date: Jun 2017
Location: Calif
Posts: 147
Default

Quote:
Originally Posted by midi459 View Post
if u want ur batterys to last dont slam them at 14.6 try 14.4 lower is longer life
u dont need to boil them .thats why they swell ...over charging and they heat up
I have heard this also. Too increase the longevity of LifePo batteries. Do not overcharge and over discharge. Keep between 90 to 35 percent. The life of these things will dramatically increase.
Rlum is offline   Reply With Quote
Old 10-23-2020, 01:25 PM   #26
New Member
 
Join Date: Jun 2020
Location: CA
Posts: 4
Default

yes this is true for most batterys lifep04 is whats used in the mercedes sprinter sieres campers .with a 160 amp alternator direct to the batterys .using a balmoar regulator we had to throttle the voltage 14.8 to 14.4 it was over charging and cooking the batterys .. these camper battery systems are designed for fast as possable charge not longevity of the batterys ..ok so the batterys dont run the ac for 4 hrs u get 3 hrs 45 min .2 v or .4 isnt that much but now the batterys will have a 6-10 yr life insted of cooked at 2 yrs
midi459 is offline   Reply With Quote
Old 10-23-2020, 01:27 PM   #27
New Member
 
Join Date: Jun 2020
Location: CA
Posts: 4
Default

https://batteryuniversity.com/
read read read .........verry interesting exspecialy for us on the road trying to live off a battery ...lifep04 are exspensive be nice to them
midi459 is offline   Reply With Quote
Old 10-26-2020, 12:58 AM   #28
New Member
 
Join Date: Apr 2016
Location: Florida
Posts: 10
Default

Quote:
Originally Posted by midi459 View Post
if u want ur batterys to last dont slam them at 14.6 try 14.4 lower is longer life
u dont need to boil them .thats why they swell ...over charging and they heat up
Right, but the Tripp Lite does not have a voltage setting available. It does have a high (45 amps) and low 11(11 amps) charge setting. Also when the battery separator kicks in you are at the mercy of the Sprinter alternator. My flooded lead acid were inexpensive batteries from Costco and lasted 4 years so not terrible.
TaxWonk is offline   Reply With Quote
Old 10-26-2020, 02:44 AM   #29
New Member
 
Join Date: Jun 2020
Location: CA
Posts: 4
Default

ur running lead acid not lifep04 and ur charger is set for lead acid or agm some batterys like 14.6
__________________

midi459 is offline   Reply With Quote
Reply

Tags
batteries, battery, lifepo4, roadtrek, rs adventurous

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 04:13 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
×