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Topic: Dead start batteries (Read 461 times) previous topic - next topic

Dead start batteries

Since the coach has been sitting the optima batteries that start her up were low.Tried a battery charger from a friend, which didn't do anything.
Bought the charger from Optima on amazon and it took 4 days or so but all three are now in the green and she starts right up. When they put in the lithium system they must have disconnected the boost due to the different battery chemistries. Not sure. Since we didn't have the AC on, I didn't have her plugged in. I should install a charge cable from the Victron inverter charger to them, there is a 2nd charger for the start batteries.
Anyway if you have Optima batteries I recommend this charger. Worked great.

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'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired

Re: Dead start batteries

Reply #1 –
Quote from: Bob and Julie –
I should install a charge cable from the Victron inverter charger to them, there is a 2nd charger for the start batteries.
If you don't keep the coach plugged in, they will still (eventually) become discharged.  Why not plug it in, if you have a way to do so?
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Dead start batteries

Reply #2 –
If the coach is not plugged in the Victron Multiplus start battery charger will not charge the start batteries.  The only sure way to prevent start battery discharge is to disconnect the start batteries when it is in storage.  Or add a passive charger (solar) to charge the start batteries.  You have a complex and expensive system that is likely unique (or certainly different from most FTs).  Get the schematics and understand how it works.  If you do not have detailed schematics then figure it out by looking and tracing wires and creating one. when you have a problem you need to know what and where to look.

Your Optimas may be compromised due to a very deep discharge.  Be sure they stay fully charged.  If your Optimas are wired as shown then move the center battery to one end or the other.

There is no reason not to have the boost solenoid connected and functional with lithium batteries for a short start assist.  Just don't leave it on.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Dead start batteries

Reply #3 –
I have been using the Optima charger for 4 years now, works great.  Remember to set it after you stop and plug in if you have it plugged in to your coach.  I have mine plugged in under the bed and unit is attached to side of bed under the skirt.  Out of the way and easy to read.
John
John and Stacey Smith
Motorcade NO: 11973
1997 U295 CSGI 40'..Build No. 5036     
920 Watts on the roof..CAT Power w/fuel Inj. Programmer
2021 GMC Sierra AT4 1500
EX..2015 Jeep Wrangler Sahara
Ex 1990 U280 RSAI 36'..Build No. 3638

Re: Dead start batteries

Reply #4 –
Even when not plugged in, I keep a small [36 watt] 3 stage agm charger on my start batteries.
This plugs into a small inverter I use to maintain the settings on the tv, sat and stereo. That way no problem with different voltages of lithium and agm batteries. I have a switch on the dash to turn it on or off.
Jim C.
coachfree, previous 1997, 1999, 2000, and 2003 Foretravels.