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Battery Choice Opinion Please UPDATE

BFL13
Explorer II
Explorer II
Updated 26 April
----------

Thinking of getting one of these to replace an old pair of wet 6s, where the price here is similar to new 6s.

Not sure if it is suitable for RV use doing 50-90s sometimes but mostly 75-100s. Is it really a deep cycle? Some graphs etc scroll down. Also is this anything like those big AGMs like Mr Wiz and PT have (although theirs are not the same as each other's ISTR-something about starved or whatever acid? )

I see their spec charging voltage is fairly low at 14.1-14.4. I have 12v deep cycle AGMs in 27 format that want 14.8ish. But their float voltages are the same at 13.7ish.

Thanks for any info/advice

http://www.esg100.com/index.php/product/index/g/e/id/35.html
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.
39 REPLIES 39

BFL13
Explorer II
Explorer II
PT you need an excuse to get out of there before it all turns to gumbo and grasshoppers again now that it is finally above freezing (if it is!). They still have pianos here I think, but I see you can get a digital player piano and app for that, so maybe not! ๐Ÿ˜ž
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

pianotuna
Nomad II
Nomad II
Thanks BFL13,

But I haven't killed my telcom jars yet. This may be my last year to full time and if so the telcom jars may last a heck of a long time with the solar keeping them fully charged between trips.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

BFL13
Explorer II
Explorer II
deleted
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

BFL13
Explorer II
Explorer II
pianotuna wrote:
Am glad the new Jar is not Junk. It could not happen to a nicer person. Thanks for sharing your data!


Thanks Don! He has more I guess, since his ad has not been pulled.
You could just pop over and grab a couple ๐Ÿ™‚ Been in his basement for a "couple of years" and he hits them one at a time with his little charger "about once a month". I was worried they might be sulphated, but took a chance.

I would like a second one, but I have enough battery now to get by for a good while.

http://www.usedvictoria.com/classified-ad/3000-Watt-Hour-Deep-Cycle-Battery-for-RV-Camping-or-Home-E...
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

MEXICOWANDERER
Explorer
Explorer
BFL

Trends

And

Tendencies

Using proper analysis

pianotuna
Nomad II
Nomad II
Am glad the new Jar is not Junk. It could not happen to a nicer person. Thanks for sharing your data!
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

BFL13
Explorer II
Explorer II
Thanks Mex, I will have to do that next time, since it is already partly charged back up from solar/alternator on the drive home (down 77 on arrival home) My Trimetric already has a default heat loss for recharging in its program so this could get complicated. ๐Ÿ™‚

I plan a "proper" 10 hour run at 12.5 amps to 50% to get a 20hr rate capacity, but not sure where 50% is! This is stupid. No hydrometer AGMs.

I will go with 12.40v resting a while after bounce back unless somebody can give me a better idea how to read that graph volt/SOC. This trip seems to say it is pretty much as rated for 250AH, so the 20hr rate test will confirm that with any luck.
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

MEXICOWANDERER
Explorer
Explorer
Raise temperature 3c and all your calculations go into the blender...

Amp hours out

Replace amp hours exactly to the number

Then go on to hit the wall at 14.4

How many additional amp hours did it take?

Divide higher number into lower

That is your CEF charge efficiency factor

Repeat the protocol using maximum amperes s recommended by OEM
Versus saturated charging at 14.4 volts
Divide lower time into higher time

That will be your charge acceptance differential

BFL13
Explorer II
Explorer II
The battery checked out ok for camping. It is rated at 250AH and spec is 95% at about 18C for inside the RV so call it 237ish.

I used about 30AH a day from it at under 20 amp draws, with no charging from solar or alternator during that time. The spec resting voltage vs SOC graph is vague, but here is what I got using the Trimetric. (Start Full 13.04v --Voltages were near resting--under an amp draw.

12.9 down 15AH,12.7 down 32 to 38, 12.6 down 56.6AH, 12.5 down 82AH, then had to use multi-meter to get two decimal places for voltage since "12.4" is somewhere near 50% SOC on the graph (I think).

12.46 down 98AH
12.43 down 104
12.40 down 112
12.36 down 120 (so 50% of 237ish)
12.30 down 130--ends--plugged solar back in and alternator for the drive home.

The spec voltage/SOC graph for this 6GFM250 AGM is the same as for my 12v 100AH AGMs for which I have the link here--so you can see how difficult it is to specify from the graph where 50% is ๐Ÿ˜ž If anybody has a clue how to read that for real life work, please post that info! Thanks.

Scroll down to graph on the right.

http://www.wegosolar.com/products.php?product=SKR%252d125AGM-Stark-AGM-12V-Solar-Battery-Sealed-125A
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

pnichols
Explorer II
Explorer II
David,

Where do you start with 14.8 volts ... on the charger's terminals or on the battery(ies's) terminals?

If on the battery(ies's) terminals ... what currents are flowing with the battery(ies's) at, say, 50% at the beginning of the charging?

If on the battery(ies's) terminals ... I believe you mentioned having a humongous charger in order for the 14.8 volts to be maintained right on the battery(ies's) terminals?
2005 E450 Itasca 24V Class C

MEXICOWANDERER
Explorer
Explorer
And according to pundits max tire life and gas mileage will occur at 46.2 mph.

The figures above make the battery manufacturer look good at the expensive of your wallet for fuel and transportation to refill.

For saturation charging of WET flooded batteries I start with 14.8 volts then charge until all cells are constantly bubbling.

If and when I connect to reliable public power I saw the charging figures noted above in half. Who cares...pistons are not going up and down and fuel tanks are not wrinkling...

wa8yxm
Explorer III
Explorer III
Whqt does 0.3CA mean.. The standard we use to rate batteries is called C/20 that means the battery's capacity (in amp hours) if discharged over a 20 hour period.

NOTE that some companies use different standards so as to get a bigger rating Example Wal*mart uses the "At one amp discharge rate" method. So a 73 AH battery has over 100 amp hours at that speed.. The faster you discharge, teh faster STILL the battery runs down.

0.3C means 30% of the C/20 rate

So if you have a battery rated at 100 Amp Hours (both G-27 and G-29 are in that range) your max charge rate is 30 amps or 0.3 times 100.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times

MrWizard
Moderator
Moderator
PT your correct 75 amps
I used 1/3 which is 33%
I can explain it to you.
But I Can Not understand it for you !

....

Connected using T-Mobile Home internet and Visible Phone service
1997 F53 Bounder 36s

BFL13
Explorer II
Explorer II
OK, off today back Thursday so we'll see if this battery is any good.
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.