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Old 01-13-2012, 03:09 PM   #21
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Here they are...


Fresh from Costco..

Battery A


Battery B


I then charged the with my Battery-Minder for 48 hours, and let them rest for 24 hours..
Battery A reads 6.47V
Battery B reads 6.47V
Linked, I am reading 12.94V.
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Old 01-13-2012, 03:11 PM   #22
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After Loading and Unloading them, i decided for safty, I better get the right tools for these heavy puppies...
Battery Lifting strap..
$6.99 with free shipping off Ebay...
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Old 01-18-2012, 12:23 PM   #23
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Just an update, and a few questions...
The two batteries have settled at about 0.02v different.
Is that ok?

The GC2's weigh in at 63lb each, so 4 of them is close to 260LB!
Add the Motor battery at 40lb, and we have 300lb hanging on the slides..
Then adding teh weight of the modified drawer, and we are deep into the slides rating of 500lb, and over their 300lb "Mobile" rating.
I am looking at what to do abbout being sure this will work...

Started work on the mods needed to the battery tray..
The floor was too shallow and badly rotted.
I am dropping the floor, and moving the divider/support over to be in a better place.. somewhere in the middle, where it will not interfere should I decide to go from the planned 4 x GC2's to a possible 6x GC2's.

Pictures will tell the story...
Original setup...


Closer inspection...



Its going away...
Drilled rivits out...



Cutting rusty floor out..







Planned footprint.
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Old 01-18-2012, 01:07 PM   #24
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Ah, that battery drawer looks so much like the one on my 83 310. It brought back memories, but fortunately, mine had no rust problems, nice solid floor. Your rebuild with the dropped floor should work well. I think you are pushing the weight envelope with the possible 6 GC batteries, but 4 is a good idea.

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Old 01-20-2012, 03:03 PM   #25
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Some more planning, and measuring..
I made some choices.
The floor will drop 2.5", and the divider will move to the center to make best use of the space, and to support the center of the tray.

This way... if I moved the Engine battery somewhere else..
I could fit 8 X GC2's in here!
Thats 520lb....

So, yesterday, cut out the divider...



And the Toolbox section lid..



Plan to put the divider back in the center, but will have to do some repair work all around...



Including moving the isolation switch, cos the diveder runs right thru it!...


Scrap..

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Old 01-20-2012, 03:46 PM   #26
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For longevity I would pick the GC batteries. Are you planning to go off grid and don't want to use your generator? gc batteries can do it all in combination with solar collectors, so you have to figure what they need to run and how much solar power you will collect and save. While traveling the motor will generate more than enough 12 v to store for lights, run the refrig and microwave, when parked you will need a large bank of solar collectors and gc batteries to store all the power the unit can use.
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Old 01-20-2012, 04:27 PM   #27
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Thanks Dave.
Yes, all the reading i did told me they were a cost effective and better way to go.

The defining moment is when you put the 2 GC2's next to one another and then compare that to a single Group 27... the sheer mass and volume, and weight tells you that the capacity is there.

The shorter term plan is to get 4 x GC's, and have 2 at each end of the tray to spread the weight load more evenly.
I would love to go for it and get 8 x but money says no at the moment!

Longer term plan to to add Solar and be able to exist off the grid and minimise or eliminate Genset use!
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Old 01-28-2012, 03:30 PM   #28
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Sheer Mass, and Volume is the key...

How does a Group 27 compare in size/volume with 2 x GC2's?

Like this...
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Old 01-29-2012, 07:19 AM   #29
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As a check of charge condition, I took the solar collector off line and put a charger on the system. My 6 gc batteries, the smart charger gave up and flashed a red light after about five minutes of trying. Did a hydrometer check of each cell and found in the center battery one dead cell. took it out of circuit and the battery charger was happy, yesterday I pulled the bad one and one of the good ones to balance the load. Can't complain as when I looked at the date of manufacture it is Jan00. One thing I found over the years has been that they use a lot of distilled water, top them up when you get them and check at least every 6 months.
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Old 12-01-2015, 08:45 PM   #30
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What are dimensions of Costco 6v cart batteries?
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Old 12-01-2015, 10:38 PM   #31
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Still satisfaid with those battery??
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Old 12-02-2015, 12:36 AM   #32
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GC2 dimensions
length is 10 1/4" x width 7 1/8" x height 10 7/8";
weight is 60+ lbs each
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Old 12-02-2015, 12:41 AM   #33
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Yeah, tell me about the weight. My battery box is big enough but it was a flat out struggle to get those beasts off the truck and onto the box. You need a good sturdy battery strap or a strapping big helper to get them in place. That said, my AMSolar system keeps them nicely charged while I keep the lousy AS issue battery boiler off them.


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Old 12-02-2015, 06:54 AM   #34
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Quote:
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GC2 dimensions
length is 10 1/4" x width 7 1/8" x height 10 7/8";
weight is 60+ lbs each
Thanks! Trying to find the right battery box
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Old 12-02-2015, 09:19 AM   #35
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Ours came from Sutton RV in Oregon.


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Old 10-13-2017, 08:50 PM   #36
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I got my small RV in 2012, used, bad batteries, so I changed to GC2s from Costco and added a Xantrex Link Lite to be sure not to over discharge them. I was very happy with them, but a couple of years later I found they were not able to run the furnace all night like they did when I first set them up. I had tried to keep them charged by always plugging in when I returned home, not always successful. I didn't know a great way to tell if they were bad or just used, so I gave up and got a new set and was back to happy.

To be sure I didn't have to replace the batteries again I purchased a solar system that keeps the batteries topped up and equalized every month. No worries about forgetting to plug in. Unfortunately I parked the RV at my cabin for the winter last year and between the snow and the pines the solar failed me and let the batteries die.

I noticed this last trip that the battery will no longer run the refrigerator anymore. The battery voltage drops too fast. Perhaps it's time for another set as it's almost 3 years. Perhaps I should get some sort of low voltage cutoff for those times when the solar isn't keeping up with the parasitic loads. Don't like killing my batteries with bad care.

What has others experiences been with the Costco batteries? Should I be getting 7 years or is that just what you get when you pay half what a Trojan cost?

-Randy
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Old 10-18-2017, 06:16 AM   #37
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I would think if you are not able to check the batteries at least weekly or so and not living in somewhere like AZ with no snow or tall trees to block the solar you might want to unplug the batteries durning non usage.

Letting any battery run down completely especially a deep cycle battery is its death abet a slow one. 3 yrs on a set of good batteries is not the norm. Some folks get 6 to 8 yrs of usage on well cared for batteries.

instead of running the furnace, a power hog, consider a heater like the thermal wave or the heat buddy type device that uses no power. better option for battery life over all.


Quote:
Originally Posted by israndy View Post
I got my small RV in 2012, used, bad batteries, so I changed to GC2s from Costco and added a Xantrex Link Lite to be sure not to over discharge them. I was very happy with them, but a couple of years later I found they were not able to run the furnace all night like they did when I first set them up. I had tried to keep them charged by always plugging in when I returned home, not always successful. I didn't know a great way to tell if they were bad or just used, so I gave up and got a new set and was back to happy.

To be sure I didn't have to replace the batteries again I purchased a solar system that keeps the batteries topped up and equalized every month. No worries about forgetting to plug in. Unfortunately I parked the RV at my cabin for the winter last year and between the snow and the pines the solar failed me and let the batteries die.

I noticed this last trip that the battery will no longer run the refrigerator anymore. The battery voltage drops too fast. Perhaps it's time for another set as it's almost 3 years. Perhaps I should get some sort of low voltage cutoff for those times when the solar isn't keeping up with the parasitic loads. Don't like killing my batteries with bad care.

What has others experiences been with the Costco batteries? Should I be getting 7 years or is that just what you get when you pay half what a Trojan cost?

-Randy
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