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post #1 of 19 Unread 07-14-2019 Thread Starter
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Charging 2 different battery types

Iím fixing to purchase a new Sterling Pro charger, and expand my batter bank. Currently i have two flooded group 24ís. 1 house, and 1 starter.

Iím going to add a 3rd battery, a group 24 for a starter, and place both the exiting group 24ís in parallel for the house.

My question is this, would it be ok to buy a gel or AGM for the starter for now and charge off the Sterling, without the add on thing that does different charge profiles? Iíve read that you typically don't want to mix battery types on a charger, just didnít know if the flooded and gelís were close enough for the time being.

Just looking at options. Eventually I want to go all lithium, but Iím not ready yet. So my thinking is just to buy a cheaper 3rd battery now and make due with what I have. The flooded batteries are only 18 months old and have quite a bit of life in them. Doubling my house capacity and adding a small bit of solar will take me a long way for now.

Thanks. FWIW, I plan on ordering the Sterling from Maine Sailís website.
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post #2 of 19 Unread 07-14-2019
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Re: Charging 2 different battery types

Better to get proper deep cycling batteries for House, not recycle the G-24s. What are they?

GEL is too different, look at the spec sheets if there is no V setpoint that suits both, might want a B2B.

Or choose your batteries according to their profile specs.

What are your other inputs besides shore power?
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post #3 of 19 Unread 07-14-2019 Thread Starter
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Re: Charging 2 different battery types

My understanding is that Group 24 is the size. The batteries are marine deep cycle. 75ah. Some northeast batter company called “The Best battery co.”

I can always just get another flooded I reckon. I’m just looking at options. If I were to replace the two I have, I’d probably go with all lithium’s, the new Trojans, and size up to the 31’s. I’m just not ready to do that right now, and I likely get by with just the two flooded 75ah’s for quite a while.

Other charge input will be 100-150w solar, likely the Victron controller.
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Re: Charging 2 different battery types

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Originally Posted by Zemurray View Post
My understanding is that Group 24 is the size. The batteries are marine deep cycle. 75ah. Some northeast batter company called ďThe Best battery co.Ē

I can always just get another flooded I reckon. Iím just looking at options. If I were to replace the two I have, Iíd probably go with all lithiumís, the new Trojans, and size up to the 31ís. Iím just not ready to do that right now, and I likely get by with just the two flooded 75ahís for quite a while.

Other charge input will be 100-150w solar, likely the Victron controller.
Yes the BCI numbers are the physical size.

As I said, you want true deep cycle batteries, there are only a handful og good brands left, and few are sold in consumer or automotive retail outlets.

"Marine deep cycle" from those channels in 12V and automotive sizes are 99.9999% crap, fraudulently labeled.
https://marinehowto.com/what-is-a-deep-cycle-battery/

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Can you fit a pair of 6V GCs?

The best battery value by far is Duracell (actually Deka/East Penn) FLA deep cycle golf cart batteries, 2x6V, around $200 per 200+AH @12V pair from BatteriesPlus or Sam's Club. Deka labeled same batts also sold at Lowes.
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Re: Charging 2 different battery types

And sticking with FLA lets you use any of the dozens of voltage-following combiner gadgets, no need to worry about radically different charge profiles.
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Re: Charging 2 different battery types

Quote:
Originally Posted by Zemurray View Post
Iím fixing to purchase a new Sterling Pro charger, and expand my batter bank. Currently i have two flooded group 24ís. 1 house, and 1 starter.

Iím going to add a 3rd battery, a group 24 for a starter, and place both the exiting group 24ís in parallel for the house.

My question is this, would it be ok to buy a gel or AGM for the starter for now and charge off the Sterling, without the add on thing that does different charge profiles? Iíve read that you typically don't want to mix battery types on a charger, just didnít know if the flooded and gelís were close enough for the time being.

Just looking at options. Eventually I want to go all lithium, but Iím not ready yet. So my thinking is just to buy a cheaper 3rd battery now and make due with what I have. The flooded batteries are only 18 months old and have quite a bit of life in them. Doubling my house capacity and adding a small bit of solar will take me a long way for now.

Thanks. FWIW, I plan on ordering the Sterling from Maine Sailís website.
It is pretty tough to mix GEL and AGM or Flooded on the same charger. GEL's need a low absorption and AGM and Flooded need higher. You can mix AGM and Flooded, provided the charge voltages are all within the right range, but a battery chemistry module or a Battery to Battery charger would be the better choice when mixing chemistries on the same charger.

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Re: Charging 2 different battery types

Get a p air of 6volt golf carts. Same footprint as most group 24, with twice the power. Bigger plates, more cups.


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Re: Charging 2 different battery types

If you are changing your batt system within the next 2ish years, just go to walmart and find one. They used to offer free replacement for 2 yrs on some batts, and may still do so.
You dont care about it beyond your change.
One and done....off your mind
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Re: Charging 2 different battery types

There are no batteries at Walmart suitable for true deep cycling usage
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Re: Charging 2 different battery types

Good feedback. The Golf cart batteries would be a no brainer if I wanted to stay with flooded long term. The drawbacks there for me is that my battery bank (and the only place to really put it) is in the port side lazerette, and I already have a weight problem on that side of the boat, in addition to the short term cost.

Another concern I have on flooded is that the current fiberglassed in battery box arrangement seems to have the batteries in the wrong orientation for healing over. Seems I read somewhere about the orientation batteries facing port or starboard was not ideal.

Long term, I think lithium is where I want to be, from a weight perspective and from a usable capacity perspective. 3 grand is just a lot to drop right now when I don't have the rest of the charging system to support them. My thought is to upgrade to a good short power charger, add solar, evaluate needs on an ongoing basis, and eventually swap to all lithium. That will solve several problems for me. Weíre trying to be very minimal on our power needs, so the most bang for the least amount of space and weight is appealing.

i think just spending $150 on a cheap flooded battery and making due with my pseudo deep cycles will hold me for a while. I probably wont go more than another year on the current batteries.

Iíve got a lot of other high dollar projects/upgrades going on right now (new sails, deck hardware upgrades, etc..).

Maines article posted above was great. Very enlightening.
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