Batteries

wa8yxm wrote:

Grumpa wrote:
TT new to me. Two batteries, dated '08, one is 75 amps, one is 675 amps. Its been awhile to have dealt with this. Should the amps be matched or is it like I have one battery? Both are deep cycle, 24dc-6, 24dp-4. Thanks. Or did I answer my own question?

Both are 75 amps.. On one you are reading Amp hours (75) and on the other cranking or cold cranking amps. That is about right for a Group 24

Second: Batteries in parallel need not be the same

Batteries in SERIES do need be the same

You have about 60-70 usable amp hours there

Easist upgrade... IF you wish and have the HEIGHT (They are taller) woudl be a pair of GC-2 (5 volt) :h in series.. These batteries have around 220 amp hours and you can use 110 of them..That's over 50% more capacity with the same footprint.

I hope that's a typo! GCs are 6 volts!

Poor guy has enough stuff to figure out as it is!

Quote:
Both are 75 amps
-----------------------------
I wouldn't bet my last $ on that !
Starting batteries of the same group size do not have as many amp hrs as deep cycle batteries.
That's why they normally do not have an amp hr rating.

Grumpa wrote:
TT new to me. Two batteries, dated '08, one is 75 amps, one is 675 amps. Its been awhile to have dealt with this. Should the amps be matched or is it like I have one battery? Both are deep cycle, 24dc-6, 24dp-4. Thanks. Or did I answer my own question?

Both are 75 amps.. On one you are reading Amp hours (75) and on the other cranking or cold cranking amps. That is about right for a Group 24

Second: Batteries in parallel need not be the same

Batteries in SERIES do need be the same

You have about 60-70 usable amp hours there

Easist upgrade... IF you wish and have the HEIGHT (They are taller) woudl be a pair of GC-2 (5 volt) in series.. These batteries have around 220 amp hours and you can use 110 of them..That's over 50% more capacity with the same footprint.

Grumpa wrote:
Yes and no

I think most would agree with me:

Yes, time for new batteries. BUT

1) What is the converter/charger? (Make, Model, if available) If it's an older unit may be (probably) due for an upgrade.

2) If you do any off grid camping, I highly recommend a pair of Golf Cart batteries.

3) If you do any off grid camping, highly recommend at LEAST 120 watts of solar panels, up to 350 or so watts of panel. (Rule of thumb for solar panel-battery ratio: 50 to 160 watts of solar per 100 Amp hours of battery.)

4) Read any and all posts on this forum about batteries, charging and solar. LOTS of good stuff here. For batteries and charging, pay attention to Mexicowanderer among othres. For solar, read BLF 13, Pianotuna and many others.

5) DON'T be shy about asking for help. We ALL needed advice somewhere along the line.

Yes and no

I assume classic shorted cell. Time for a new matched set.

Do you camp off grid?

Well the outcome was not good. Charged boiled over big time. Baking soda. They were 100 amps and 140. My bad read wrong. Thanks for the input.

Those above are right. From the numbers you gave I'd suspect they are both group 24s. If they are both still alive after 7 years someone has been lavishing them with TLC. Certainly beyond the end of normal lifespan.

Golf Cart Deep cycle batteries have the same footprint as group 24 batteries but are a couple of inches taller and MUCH heavier--about 66 pounds each. GCs are much more robust and will supply about 50% more Amp-hours, 220 to 240 depending on the manufacturer. (Or perhaps depending on their claims) They will also stand up to deep discharging much better.

The dc is a deep cycle w/ 75 amp hrs.
The dp is a dual purpose battery w/ no amp hr rating because it is not a true deep cycle battery
They can be run together just fine,.....if they are both in good condition after tested

The batteries should have Ampere hours marked on them somewhere. That is what you should use to compare them.

I agree completely with Dakota98.