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Topic: new Batteries (Read 1775 times) previous topic - next topic

Re: new Batteries

Reply #25 –
Quote from: danilaprepeleac –
thank you  Roger and everyone for your wisdom.
i will try tomorrow to see if the coach negative is long enough  to reach the top battery  terminal.
I had a feeling that  they were not wired the best optimal way.
Just to add to the confusion I keep a 9/16 wrench in the battery storage area secured in place with two earth magnets so if I ever need to disconnect batteries the wrench is right there for the job. A battery disconnect would meet these needs also. Its set up to remove the primary ground in a emergency that I keep in the most accessible position.
Scott

Re: new Batteries

Reply #26 –
As you mention, a battery switch like this one is another, under $50 choice and is well more than capable of all house loads (rated for 250 amps continuous duty).

You would not run the inverter 12 VDC power through it, but that feed already has a fuseable link to protect it.

PERKO Inc. - Catalog - Battery Switches - Medium Duty Battery Disconnect...
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: new Batteries

Reply #27 –
Quote from: danilaprepeleac –
Roger i just got the Victron BMW 712.
do you have this installed in your coach ,would like to be able to understand how exactly gets hooked up.
if you don't mind using the last drawing can you please show me where it gets added to the system and did you take it up in the coach or just left it in the bay since it has the Blue tooth communication.
Daniel
I just had one of these installed in my coach last weekend.  The shunt that measures the draw and charging to the battery is installed on the negative post where all the loads are grounded now, then those grounds are moved to the other side of the shunt.  This is how it measures the usage across the shunt.  There is then a connection wire that goes from the shunt to the display unit.  Mine was installed in the circuit breaker/fuse cover panel in the electrical bay.  Like you said, most likely you'll use the Bluetooth to read the BMV, so placement isn't critical.
Keith
2003 U320 38' #6197

Re: new Batteries

Reply #28 –
danilaprepeleac, (Daniel?)

The Victron BMV shunt has the battery side post connected to the negative side of the batteries.  If they are wired in parallel then the end of that connection chain connects to the battery side shunt post.  Then from the load side shunt post a negative cable will usually go to the coach common negative post behind the white fiberglass panel. Some coaches have this covered with a thin carpet-like material.

All negative connections to the house batteries are at or past the shunt load side post including the inverter/charger, any other chargers, solar chargers, and anything else.  This allows the the shunt to see all powered flow out of the batteries and back into them.

The cable with the RJ12 plugs goes from the shunt to the back of the BMV-712. 

The red wire with a fuse goes from a positive battery terminal to the B1 connection on the shunt. This provides the reference voltage to the shunt and power to the BMV-712.

The B2 connection can be just a wire to the start batteries so you can monitor their voltage.  You can also get a temperature sensor that connects to a Plus battery post.  It has two wires that gets connected to the B1 and B2 connections.


I also have a Drok power meter in the connections to my small inverter. It let's me see how much 12v power goes into the small inverter to make it's 120v output.

Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: new Batteries

Reply #29 –
Been following this thread and now find myself in the same position.  I decided NOT to make the move to lithium at this time and am going to pick up 3 8D AGM Orielly batteries today. 

I have the original prosine 2.5 and the current batteries are the MK Dominator gels (10yrs old).  One is bad so therefore the replacement.

The prosine manual suggests I treat the AGMs like Gels but have read other posts that suggest treating them as wet/flooded.


Spoke with East Penn tech support yesterday and they said to be safe and treat them as wet cells.  They also provided these details:

13.8v - 14.8v max charge voltage assume absorption

13.5v float

30 amp max charge current for 245Ah

I didn't really understand the 30 amp max rating so when I asked they said it will keep the batteries from overheating. 

Called xantrex support and am still waiting for a call back.

Now my question is what settings should I be using on my prosine 2.5 and do I need to change my alternator settings.  I have not tested the voltage at the isolator yet.

I have an "appointment" with oriellys this morning to get them installed so should I leave the new batteries disconnected until I figure this out to be on the safe side ?




2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC

Re: new Batteries

Reply #30 –
If your inverter/charger does not have a charging curve tailored specifically for AGM's, yes, use wet cell program. But, I would be surprised if you don't have an AGM curve.  Have you read your inverter/charger and its remote manual?

Gels are different and ideally you will have a separate gel setting.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: new Batteries

Reply #31 –
When you hook up the three batteries in parallel your charge rate can be 90 ah.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean