Battery type - advice/views please?

[xeitosaphil]

Unfortunately two of my three house batteries have gone caput, and I have decided to renew all three and keep the existing one as a spare.
I have a separate engine start battery so it’s only the domestic bank, however the house bank may need to start the engine in an emergency. ( cabling is sorted for this )
The original bank was a mixture of sealed and open lead acid leisure batteries, and the one that is still ok is a 6 year old Numax CXV31MF which I have had drop tested and checked( by our local battery company), and was showing 12.76 rested Voltage with 700A capacity( don’t know how they tell capacity but they are cleverer than me so accepted it). Due to its age I am not worried about it as a spare.
I wondered if I might get a deep cycle bank this time around which would be better suited to discharge rates? Having researched extensively I would liked to have one of these

http://www.atlasbx.co.kr/en/product/marine02.jsp XDC Series (Extreme Dual Purpose MF) ------- XDC31MF which weigh 30Kg so must be quite good deep cycle capability?

Performance details available on link to download

http://www.atlasbx.co.kr/en/support/catalogue01.jsp

Unfortunately these don’t seem to be available in the UK unless anybody knows of a source? They are available in Greece but that is of little help.
As a possible alternative I wondered about these
http://www.atlasbx.co.kr/en/product/marine03.jsp

The DC31MF 100Ah --------- This I think is sold by Battery Mega store as Hanook a Deep Cycle battery but is in actual fact a Leisure battery?

Question is, if I were to replace current bank with " True deep cycle" batteries would they be able to withstand an emergency start without doing any damage to the batteries? Or would it be better to stick to Leisure type as above.
I’m not sure what the difference is with this battery XV31F which I assume is the same as my original Numax CXV31MF which Atlasbx state as a engine start only?

Incidentally I don’t have the room for, or the funds for 4 x T 105’s

Engine is a 2GM20, available charging is by 90a alternator/Adverc, 100w solar panel and Ctek M300 mains

Thanks for any advice received

Philip

 

[Sandyman]

My advice. Stick with the Numax. They are our house batts in use 24/7 for past 10 years.
Also available for use as engine start but never had to use. Engine start batts also Numax.

 

[PetiteFleur]

I also have the Numax, 2 batteries used for both engine start and domestic. Now 7 yrs old and still fine. From battery megastore.

 

[BabaYaga]

Question is, if I were to replace current bank with " True deep cycle" batteries would they be able to withstand an emergency start without doing any damage to the batteries? Or would it be better to stick to Leisure type as above.

In my view both the leisure type batteries linked to and true deep cycle batteries could be used for emergency starting without any damage or other issues.

 

[macd]

1. I have had drop tested and checked( by our local battery company), and was showing 12.76 rested Voltage with 700A capacity( don’t know how they tell capacity but they are cleverer than me so accepted it).

2. I were to replace current bank with " True deep cycle" batteries would they be able to withstand an emergency start without doing any damage to the batteries?

1. There is no such thing as 700A capacity. Battery capacity is generally measure in Ah, but you'd need a crane to get a 700Ah lead-acid battery into your boat. They may have told you the CCA was 700A, but that would have been extrapolated, anyway, unless they shoved them into a deep freeze before testing. (CCA is the peak amps at zero degrees F.) Drop tests are of use mainly on starter batteries and tell only a limited story on leisure/deep cycle.

2. If you're thinking of something like flooded deep-cycle Trojans, they'll start an engine no problem. Trojan say as much. Three of them (or 2 x 3 if 6V), won't even notice the drain.

 

[xeitosaphil]

My advice. Stick with the Numax. They are our house batts in use 24/7 for past 10 years.
Also available for use as engine start but never had to use. Engine start batts also Numax.

Are all the Numax Leisure batteries? or are they a mixture of leisure/start, and pure deep cycle/Domestic - only I see they sell both sorts?

What Model /Ah have you used for the Domestic bank? mine are 110Ah's

 

[sailorman]

My advice. Stick with the Numax. They are our house batts in use 24/7 for past 10 years.
Also available for use as engine start but never had to use. Engine start batts also Numax.

Who manufactures the Numax

 

[xeitosaphil]

1. There is no such thing as 700A capacity. Battery capacity is generally measure in Ah, but you'd need a crane to get a 700Ah lead-acid battery into your boat. They may have told you the CCA was 700A, but that would have been extrapolated, anyway, unless they shoved them into a deep freeze before testing. (CCA is the peak amps at zero degrees F.) Drop tests are of use mainly on starter batteries and tell only a limited story on leisure/deep cycle.
2. If you're thinking of something like flooded deep-cycle Trojans, they'll start an engine no problem. Trojan say as much. Three of them (or 2 x 3 if 6V), won't even notice the drain.

1. In reply, the chap who did the drop test on each individual battery also had a sophisticated electronic meter which he used at the same time as the drop test was carried out. He mentioned 700, but didn't quite hear the rest . as I didn't hear properly I took it to mean Cranking Amps capacity, as the battery is only 110Ah with a CCA of 1000 - New and fully charged. I took the 700 to be a proportion of that, rightly or wrongly?

2. In reply as I mentioned, I can't fit in, or afford T 105's or the 12v equivalent, but Numax and Hankook ( which I assume are the same battery only differently badged probably manufactured by Atlas in Korea ) apparently sell leisure and D/Cycle ( although loosely described) so I may have a choice? or are there any more suitable batteries out there. I just wondered if one type would be better than the other, in my situation.
Other threads have suggested, and what I have also read on the web recently, that there are many suppliers selling the same batteries from a limited number of manufacturers but just sticking their own labels on them. Apparently even Varta Lead acid batteries are no longer made in Germany, but in China, Varta AGM batteries are still made there, and Manbatt, re- Numax also seem to be just distributers of distant Far Eastern manufacturers?

Lots of different distributers batteries all carry the same basic number codes which tend to support my theory, that there may be only a small number of battery manufacturers World Wide, and Atlas is one of them ( only my own observation)

Thanks for the replies so far

Philip

 

[PaulRainbow]

My money would go on some 110ah wet cell, lead acid batteries. Most likely Numax. Cheap as chips, can be topped up and will start the engine just fine.

 

[Sandyman]

Are all the Numax Leisure batteries? or are they a mixture of leisure/start, and pure deep cycle/Domestic - only I see they sell both sorts?

What Model /Ah have you used for the Domestic bank? mine are 110Ah's

Use 2 times 110Ah Numax leisure for engine start, and the same set up for domestic.
24v system. With the starter bank of 220Ah never seen the need for deep cell batts.
Starter batts from Batteria Megastore were replaced about 8 years ago.

 

[Sandyman]

Who manufactures the Numax

Sorry can't help you there. Came recommended years ago. Stuck with them & have never had any problems. Guess like everything they have a life span but when they need replacing I will have no complaints.

 

[sailorman]

Sorry can't help you there. Came recommended years ago. Stuck with them & have never had any problems. Guess like everything they have a life span but when they need replacing I will have no complaints.

Most batteries are Korean made & re-badged, check out the cases & posts , they are all the same no matter what sticker is applied to them

 

[xeitosaphil]

Isn't that what I said in Post 8 ?

Sorry Sailorman, reading this post back again this morning it sounds a little hostile, which was not my intention.

I would like to thank all for their replies and am grateful to all who contributed with advise

Philip