Nina Lucia
Well-Known Member
I just need one, as a starter batterie 110-130 AH AGM Dual purpose batterie. Any suggestions where to buy one at reasonable price?
110-130 AH AGM Dual purpose batterie
- Thread starter Nina Lucia
- Start date
PaulRainbow
Well-Known Member
You don't need "dual purpose" for a starter battery and starter batteries don't normally have an AH rating, you need to go by CCA for engine starting. What engine is it ?
Nina Lucia
Well-Known Member
Hi Paul, we have old Volvo 2003T, I was thinking to replace soon two domestic as well, for AGM, and I tough might best to have all AGM?
What CCA do you think we need for our engine, and can you recommend where to buy one?
Thanks
What CCA do you think we need for our engine, and can you recommend where to buy one?
Thanks
PaulRainbow
Well-Known Member
You could use lead acid for the starter and AGM for domestics, but it certainly won't hurt to use AGM. I've fitted a lot of Hankook batteries, such as this one, 680CCA:
Hankook SA56020 AGM Starter Battery: Type 027
Or a little bigger if you want: https://www.batterymegastore.co.uk/product/hankook-sa57020-agm-car-battery/
Pick one that fits nicely.
Hankook SA56020 AGM Starter Battery: Type 027
Or a little bigger if you want: https://www.batterymegastore.co.uk/product/hankook-sa57020-agm-car-battery/
Pick one that fits nicely.
[70521]
Well-Known Member
I replaced all of my lead acid batteries, starter and domestic, with AGMs last winter. c70 Ah for starter and 3 * 130 Ah for domestic.
I specifically went for batteries that had a low profile to fit them in the existing location.
I specifically went for batteries that had a low profile to fit them in the existing location.
Ink
Well-Known Member
[70521]
Well-Known Member
No problem
12V 130AH EFB AGM LEISURE BATTERY HEAVY DUTY LOW HEIGHT (100 ah 110ah 120ah 125 | eBay
It was the 190mm height that was the key for me. They were also the same size as the 100 Ah. While the battery purists may have issues over that they have worked without any worries this year on both shore and alternator charging.
CPD
Well-Known Member
I haven't been keeping up with battery technoogy. What advantage do AGMs offer over the traditional lead-acid for domestic applications ?
Tranona
Well-Known Member
Longer life (greater number of discharge cycles) faster charge acceptance, lower self discharge. Generally the greater cost is less than the longer life, but whether this is of value depends on your usage pattern and time horizon for the decision.
Nothing new - AGMs have been around for years. However they have traditionally had a bigger price premium as the market was limited. Growth in the RV market and particularly the adoption in the automotive market for stop start has brought greater choice and falling prices as in the Hankooks suggested above.
My boat has Exide AGMs as used in Jaguars. 3*95AH which retail around 30% premium over similar capacity leisure batteries but with potentially 50%+ longer life. Now 6 years old and expect to last at least 10 years.
Nothing new - AGMs have been around for years. However they have traditionally had a bigger price premium as the market was limited. Growth in the RV market and particularly the adoption in the automotive market for stop start has brought greater choice and falling prices as in the Hankooks suggested above.
My boat has Exide AGMs as used in Jaguars. 3*95AH which retail around 30% premium over similar capacity leisure batteries but with potentially 50%+ longer life. Now 6 years old and expect to last at least 10 years.
Nina Lucia
Well-Known Member
Thanks Paul,
Will it be better if I get little bit bigger one, like varta-silver-dynamic-agm-g14-car-battery-uk-part-code-019
its 95AH, might last little bit longer and not that more expensive ?
Thank you
CPD
Well-Known Member
Really interesting. Thank you for taking the time to reply !.
CPD
Well-Known Member
Just to clarify ...... no change in charging system at all from lead acid to AGM ?. Many thanks ...........
[70521]
Well-Known Member
Plus :
- They don't give off hydrogen gas when charging;
- The won't leak acid if the case breaks; and
- They are happy at almost any angle.
PaulRainbow
Well-Known Member
For an engine start battery, it doesn't offer anything extra, unless you have to crank your engine for an extremely long time.
[70521]
Well-Known Member
My charger has a setting for either lead acid or AGMs. I just flipped the switch. It is only a 25v charger and with a total of 570Ah onboard (there is a 110Ah lead acid for the anchor windlass) some would consider that the charger was on the low side, but I've never had an issue. I don't use a huge amount of power, about 70Ah per day with all the essential systems on. The fridge is only on when motor sailing or on shore power.
My usual bulk charge is c13.8v then a float of c13.2v.
PaulRainbow
Well-Known Member
PaulRainbow
Well-Known Member
Sandy, the absorption voltage is way too low, i'd suggest 14.4v, float is also a little low, i'd say 13.4v would be better. Definitely need to change the absorption voltage, 13.8v is typically the upper end of the float band, they'll never get fully charged.
PaulRainbow
Well-Known Member
You need to check your current charging voltages, but most modern, traditional, lead acid chargers can be used for AGMs.
Wing Mark
Well-Known Member
Surely that will take a long time to charge, but maybe that doesn't matter to you.
Is there a reason for having quite a big battery bank with modest demands on it?
[70521]
Well-Known Member
So that I don't discharge the batteries too far. I am often on multiple day trips without shore power and prefer to sail rather than use the iron sail. The effort over the last two years has been reducing the output. Fitting the Hydrovane this winter will take the autohelm out of the equation on long passages. Solar is the 2022/23 project.
