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Old 03-25-2012, 04:05 PM   #11
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Excellent post, Chak. I'm getting ready to replace my Grp 24 12V with two GC2's (6V) that I picked up today at Sams Club. On Roy B's advice, I picked up a 25' spool of 4AWG wire, lugs, grommets, bus bar, fuse, etc. Over the next week or so, I hope to complete this mod installing the two new batteries in a front mounted toolbox.

Thankfully, my converter has "Charge Wizard" technology built-in. I want to do this incrementally (as I can afford to) but eventually, I will add a 1500-2000W pure sine wave inverter to the mix. Maybe someday, solar panels....
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Old 03-25-2012, 06:19 PM   #12
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We have a 31 FS. If we use the furnace at all the battery is always at 1/3 in the morning. I changed the battery and it is still at 1/3 in the morning. IMHO just not enough battery for the motorhome, Jayco should of made room for a second battery.
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Old 03-25-2012, 09:21 PM   #13
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Originally Posted by Riplin View Post
We have a 31 FS. If we use the furnace at all the battery is always at 1/3 in the morning. I changed the battery and it is still at 1/3 in the morning. IMHO just not enough battery for the motorhome, Jayco should of made room for a second battery.
Riplin - keep in mind that the meter built into the camper is not accurate by any means. It can come close, but will never be a good indication. Most importantly, when you check the battery, make sure ALL loads are turned off. Preferably, leave them off for an hour or two (but I realize this isn't practical when camping).

Those built in meters are especially bad for telling when the battery is full. Are you camping, running a generator for a few hours to charge (checking the meter as to when to quit charging?) Sadly, this won't work out well as you get higher readings than reality right after/during charging.

Check your battery, with a cheap volt meter and hydrometer. This will give you an idea if it may just be bad.

31 foot is a big space to heat - it may take quite a battery bank to do better. That said, optimizing what you have may help. How far is your converter from the batteries? I ask because many models have WAY to much wire between the 2. This prevents the batteries from taking a charge without 10's of hours of generator time.

Also, look at your converter. If you are re-charging with a generator, a 2 stage converter will take 10+ hours, whereas a 3 stage can get you to 90% in a couple of hours. (lots of variables here, but in general)

Hope this helps...

-Chak
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Old 03-26-2012, 07:04 PM   #14
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Originally Posted by Chakara View Post
Riplin - keep in mind that the meter built into the camper is not accurate by any means. It can come close, but will never be a good indication. Most importantly, when you check the battery, make sure ALL loads are turned off. Preferably, leave them off for an hour or two (but I realize this isn't practical when camping).

Those built in meters are especially bad for telling when the battery is full. Are you camping, running a generator for a few hours to charge (checking the meter as to when to quit charging?) Sadly, this won't work out well as you get higher readings than reality right after/during charging.

Check your battery, with a cheap volt meter and hydrometer. This will give you an idea if it may just be bad.

31 foot is a big space to heat - it may take quite a battery bank to do better. That said, optimizing what you have may help. How far is your converter from the batteries? I ask because many models have WAY to much wire between the 2. This prevents the batteries from taking a charge without 10's of hours of generator time.

Also, look at your converter. If you are re-charging with a generator, a 2 stage converter will take 10+ hours, whereas a 3 stage can get you to 90% in a couple of hours. (lots of variables here, but in general)

Hope this helps...

-Chak
Thanks for the input. We dry camp about 50% of the time. I checked the battery voltage at the battery with the gen running and found it to be 13.2volts. Way too low to put a real charge into the battery. With that being said we can drive all day and spend a night with the furnace on still have the battery at 1/3 or below. I know the gauge in the command centre is cheap, not the greatest. But when there isnt enough battery to start the gen it is 1/3 or alot lower. I bought an external battery charger and 2 2000w champion inverter gens as well as a second battery to hook up when we camp in cold weather. The single battery is along way from the converter. But I have no desire to change that. I will add a permanent 2nd battery this summer in an outside storage compartment. I still believe that Jayco did a disservice by only providing one battery compartment on such a large RV.
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Old 03-28-2012, 09:12 AM   #15
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Well took the greyhawk back to the dealer to find out what was draining the battery over night. The tech found that a solenoid was not closing and was causing the draining. Battery checked out OK.
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