diy solar

diy solar

turning off the charger - RV

jvbutter01

jvbutter01

New Member
Joined
Aug 20, 2020
Messages
208
As I have been reading posts, the LifePo batteries do not want to be, "trickle charged" or don't want to float the batteries for long term. If I have a RV, battery bank (280ah) on board, with a charger (PD9130LV ) connected on shore power side. What is the easiest way to keep the charger from constantly floating the batteries when we are in RV park and 100% connected to shore power? Is there a smart switch? I don't want to open the elect box and unplug the charger each time. The shore power will be connected to the 110 side of my power box.
 
jvbutter01 said:
As I have been reading posts, the LifePo batteries do not want to be, "trickle charged" or don't want to float the batteries for long term. If I have a RV, battery bank (280ah) on board, with a charger (PD9130LV ) connected on shore power side. What is the easiest way to keep the charger from constantly floating the batteries when we are in RV park and 100% connected to shore power? Is there a smart switch? I don't want to open the elect box and unplug the charger each time. The shore power will be connected to the 110 side of my power box.
Click to expand...
LFP batteries are happy to sit for extended periods at 100% or near to it. Useing a seperate port BMS it will disconnect the charge side of the battery while allowing it to be discharged if needed.
 
schmism, i will have to look into the "separate port bms" you speak of. haven't heard of that type.

Ok, thanks snoobler. I read about that, but here on forum, i've read against constant trickle charge, Yes Snobbler, it is specific LifePo type charger. I'm pulling the standard charger out of the trailer just for this reason. this makes things easier.
 
jvbutter01 said:
schmism, i will have to look into the "separate port bms" you speak of. haven't heard of that type.

Ok, thanks snoobler. I read about that, but here on forum, i've read against constant trickle charge, Yes Snobbler, it is specific LifePo type charger. I'm pulling the standard charger out of the trailer just for this reason. this makes things easier.
Click to expand...

The forum's position has been very consistent that floating between 3.30 and 3.40V/cell is safe.
 
Hello,
maybe I'm not in the right spot here but..

My question is,, my 5th wheel came with a 120v to 12v supply and charger...its working fine..
BUT I want to change out the stock FLA with LifePo.. the stock charger only knows one chemistry FLA
there is no way that I know of to disable just the charge function...is there ?
 
snoobler said:
You have a Lithium specific model of that charger. You shouldn't have to worry about it.


After charging, it floats at 13.6V. If there is no battery use, it drops to 13.2V.

LFP batteries may be floated indefinitely at 3.4V or less. That's 13.6V with 4 cells.
Click to expand...
I've heard 13.4 or 3.35 per cell is optimal but still slightly decreases lifespan.
diysolarforum.com

Charging method lifepo4 280AH EVE (float or not.)

So even with an low voltage its able to charge to 100% SOC Depending on what rate you charge with, you'll get at the same state of charge at lower voltage.
diysolarforum.com diysolarforum.com
 
If the trailer were in "storage"...yea that would work..
I full time...if I did turn it off I would also lose basic functions...
Refrig, lights,smoke detectors,propane sniffer,fans...etc..
 
Hey Will .....

Is there a Dc to DC converter device that will convert the FLA charge to Lifepo ?
or even a replacement for the stock supply/converter that IS compatable ?
 
RamblinRec said:
Hello,
maybe I'm not in the right spot here but..

My question is,, my 5th wheel came with a 120v to 12v supply and charger...its working fine..
BUT I want to change out the stock FLA with LifePo.. the stock charger only knows one chemistry FLA
there is no way that I know of to disable just the charge function...is there ?
Click to expand...
I assume you mean a converter, confirm?
What is the make and model of the converter?
 
RamblinRec said:
If the trailer were in "storage"...yea that would work..
I full time...if I did turn it off I would also lose basic functions...
Refrig, lights,smoke detectors,propane sniffer,fans...etc..
Click to expand...
Well, sort of. Those items run off of your battery not off the converter directly. Then the converter keeps your battery charged.
so you could turn it off for a learned period of time and then turn it back on. Of course that means you have to remember to do so.

I realized that when I added LiFePo4 batteries and an inverter/charger, that two things happened. 1. If I left the converter in, it would be trying to run off the AC produced by the inverter. This would be the battery running the inverter to run the converter to charge the battery. Dumb.
2. the snazzy new inverter/charger is way smarter than the converter.
I just wish that I realize that before I spent $$$ on the Li compatible converter
 
I did see this...whatever it means...
WF-9800 Series converters are equipped with an advanced 3-stage charger
 
RamblinRec said:
I did see this...whatever it means...
WF-9800 Series converters are equipped with an advanced 3-stage charger
Click to expand...
Page 6 of this manual explains the charging algorithm.
also

Its not terrible.
But you could do better.
As @richard cabesa alludes an inverter/charger with built in transfer switch is the way to go.
A good inverter charger will allow you fine grained control of the charge profile.
You also generally get a configurable low voltage disconnect plus lots of other goodies.
IMO an updated ac2dc converter is a waste of money.
I'm guessing you already purchased a dedicated inverter, confirm?
 
You must log in or register to reply here.

Similar threads

W
EG4 6000XP 120v AC grid connection to 120/240v L1 and L2 input
2
Replies
32
Views
1K
Marobel
M
H
I made a rookie mistake, connected two 110v sources at the same time, any ideas?
Replies
4
Views
395
heavenorbust
H
L
Off-grid inverter in rv ground to chassis via panel?
Replies
0
Views
83
LordKitsuna
L
M
Charge and discharge patterns for an RV with Lithium Batteries
Replies
7
Views
450
MarcoWasRight
M
B
Shore Power / Alternator / MPPT
Replies
2
Views
385
Bootboiler
B
Back
Top