Leisure Battery Info - 95Ah Branded vs 120Ah Non-Branded

[Starfox]

Hi - Sorry another question on Leisure battaries. I have just purchased a new Yuasa AGM 95Ah leisure battery (From Halfords for easy collection!) for £165. I wanted a well-known brand. It is replacing a non-branded 135AH 'Deep Cycle' one which is done (It is rated as 135Ah C100 if that matters)

I am having last-minute reservations given the one it is replacing was 135AH and was considering something like the below as it is around the same price but 120Ah but I cannot see much detail about it (Marine MCA is less actually than the Yuasa one). However it is obviously a non branded battery so I don't know if this matters as much as the higher Ah rating?

Advanced AGM LP120 Leisure Battery 120ah 12v | Advanced Battery Supplies

The Advanced AGM LP120 leisure battery is a low profile height 120ah dual purpose battery type. This absorbed mat technology sealed unit is popular for Motorhomes, Camper Vans and many other applications. AGM Leisure batteries can be drained using 70% of their capacity. They can also be charged...

advancedbatterysupplies.co.uk

Additional info - new solar panel being fitted (200W replacing damaged one with a new Victron MPPT) and next on the list would be DC DC upgrade to support the higher AGM charging given I have a Euro 6 engine. Battery stored under the seat so need the 190mm height. Just running basic stuff out of a T6.1. Thanks!

 

[T6Jay]

Not all 95Ah batteries are equal!

Some manufacturers Ah rating is based on C20 (20 hour discharge), and some on C100

So a 95Ah C20 may be equivalent to a 105Ah C100

Worth checking the specs beyond the quoted Ah!

For example:

This is marketed as 105Ah: 12V 105AH Expedition Plus AGM Leisure Battery - Alpha Batteries

This is marketed as 95Ah: 12v 95AH Exide EP800 Dual AGM Leisure Battery NCC Class A - Alpha Batteries

but the C20 ratings for both are 95Ah

 

[CJW]

Customer support was important for me so I went branded. I wanted to know what the safest charge current was for my Exide EP800 (by chance the second example @T6Jay shows above) so I emailed Exide and got a thorough reply. This meant I could set my DC-DC charger at a known safe charge level.

 

[T6Jay]

Customer support was important for me so I went branded. I wanted to know what the safest charge current was for my Exide EP800 (by chance the second example @T6Jay shows above) so I emailed Exide and got a thorough reply. This meant I could set my DC-DC charger at a known safe charge level.

As it happens, that's the battery I have too. What was the safe charge level?

 

[CJW]

As it happens, that's the battery I have too. What was the safe charge level?

Hi

Here was my question:

Good morning. Sorry for the caps! I have a technical Question please. I have
the Ep800 dual agm battery, and Am trying to find out what the maximum charge
acceptance is in amps. I’m charging it through a renogy DC-DC charger
(Dcc50s) which has the potential to present 50A to the battery under certain
cIrcumstances unless I change the default settings. Many thanks. Chris

…and here was the answer…

Thank you for your enquiry, please find details below;

Bulk Charging (Constant Current)12 volt Battery
Charge at a constant current rate of no more than 10 times I20 to a voltage of 14.4V (example; For C20=100Ahr, the max charge current is 10x5A or 50A).

Absorption Charging (Constant Voltage)12 volt Battery
Charge with 14.4V limit for 12 to 24 hrs or when current drops below 1% of the C20 rating (example; C20=100Ahr, the low current shut off is 1%x 100 or 1A).

Float Charging (Constant Voltage)12 volt Battery
13,7V with current limited to 4 times I20.

Trickle Charging (charge maintenance during extended storage)
Charge voltage on point - 12.50vCharge voltage off point - 13.6v Limit current to 0.4 times I20

…so I set my dcc50s to output a max of 40A, rather than the default 50A.