43 replies to this topic

[VanGoOutdoors]

So I have a dec 2016 build camper (so you know the battery age)

Dual exide option, 150ah of power
I have charged the battery to 13.6 v as read on a meter
After 12 hours overnight, with only the fridge set to 5, it's at 12.5v

The math doesn't add up. Everything else is turned off, and from what I can find with the 2ah (two way 85 fridge) the fridge takes, there's no way it should eat up that much voltage.

Thoughts before I spend 500 on two 6 volts?

I am going to pull both batteries and have them tested at camping world, who is an exide dealer, to rule that out, but that seems like far too much of a rapid discharge for the small load.

Thoughts?

[nikonron]

Do you have the fridge loaded? It's difficult to cool air.  Ron

[VanGoOutdoors]

Do you have the fridge loaded? It's difficult to cool air.  Ron

There are about 12 bottles of water in there. 

but even if it ran continuously (which it doesnt) for 12 hours, thats only in theory 24 amp hours of use from 150, and even if you factor only going to half charger for 75 AH used, the math STILL doesnt add up

[Beach]

If you are just turning fridge on and it isn't precooled, then your amp draw is more than 2A. Not to say you don't have a battery issue but you might be drawing 4-5A(or more)/hr X 12hrs,  trying to initially cool that fridge

[VanGoOutdoors]

The fridge had been on now for 7 days, with no less than 12 bottles of water, never opened for the past two days

[Captm]

What type of exide batteries do you have?

[nikonron]

13.6 is just a surface charge, do the math from 12.6, which is a more realistic number for a fully charged 12 volt battery.  Ron

[VanGoOutdoors]

What type of exide batteries do you have?

The deep cycles that come with the four wheel camper. 

fp-agm24dp

 

My big issue, is that im TOLD that the blue sea cutoff is at 12.4v

 

Well, by this, according to *power charts* its at 75% at 12.4, yet has a low voltage cutoff so the truck battery wont charge it with a theoretical good amount of power.  

I have solar, but if overnight the batteries go to 11.9 as they did on my trip, then there is an issue (two fans on medium and fridge)
I may just pull the blue sea isolator and install something lower voltage.  I have an X2 power battery in the truck (northstar) that ran my Snomaster fridge for 3 days, didnt hit a low voltage cutoff on the unit, and also charged 3 phones a speaker and two camera batteries all day.  Just seems like these batteries arent really giving great performance with that as a benchmark

WHat was pointed out was this item that separates at 12.4v and wont reactivate until 12/4 is reached somehow (solar, generator etc)

https://www.bluesea....12V_24V_DC_120A

but i dont read any function of the sort like that on the site. 

Edited by broverlanding_tacoma, 27 July 2017 - 05:28 PM.

[rando]

This is the problem with using voltage to measure state of charge - the batteries need to be at rest (ie no load, no charge) for at least a couple of hours before making a measurement.   If anything I would say the numbers you saw are totally normal.     If your fridge was running when you saw 12.6v that would mean your batteries were still almost completely charged.   If that was after the fridge had been off for a while then your batteries were at about 75% SOC.

[nikonron]

The fans alone will pull 26 amps in 10 hrs. on a medium setting.  Ron