Is this a sealed or a flooded battery?

O

Oscarpop

Well-Known Member
Joined
31 Jul 2011
Messages
1,053
Location
Kent
Visit site
I have these batteries on my boat

Numax Sealed Marine Battery 100Ah MV26MF

Numax Sealed Marine Battery 100Ah MV26MF. CCA750. Numax flooded, maintenance free marine battery perfectly fits the bill if you want a well built, quality battery. Numax stands for quality, reliability and durability, and this range certainly ticks all three boxes here. Many thousands of people all around the UK have trusted in these Numax batteries over the last couple of decades, and have certainly benefitted from their choice. The range boasts: •Fully sealed for enhanced safety •Advanced semi-traction technology envelope separation for deep cycling •Original equipment specification •Dual purpose engine start and auxiliary capability •A full 2 years warranty •Thicker grids for longer life Dimensions: L302mm x W172mm x H225mm The Numax Marine Battery range is a quality range of high powered batteries engineered with the latest technology for todays and tomorrow’s leisure needs.

I am in the process of selecting the dip switches on my mppt controller and I have the option of selecting sealed or flooded.

I beleive that these are sealed and flooded, so would think about selecting sealed.

Is this correct?

Many thanks
 
My charger has the ability to set for sealed and flooded, if memory serves me right.....
Sealed charges at 14.4
Flooded charges at 14.8

They are sealed so set up as that, it won't do any harm to these batteries if you chose the wrong setting.

Somebody will be along soon to tell you my info is duff :D

Tom.
 
Last edited:
As they claim it's sealed, I'd suggest you treat it as such.
If still undecided ask Numax.

The difference will probably in the voltage chosen as float voltage, a lower one for gel batteries. There are as many voltages quoted, ranging from 13.4 to 14.4 for open, flooded batteries, as there are authorities, so I would definitely recommend getting it from Numax, so to speak, the horse's mouth. Ideally you should have a temperature sensor to reduce the voltage down with increasing temperatures.
 
I could be wrong, but I suspect that flooded means you can top them up, sealed means you can't, at least, not easily. The flooded setting will probably use a higher voltage that would result in some gassing, so you'd eventually need to top them up, the sealed setting would use a lower voltage to reduce gassing to a minimum.
 
Stemar said:
I could be wrong, but I suspect that flooded means you can top them up, sealed means you can't, at least, not easily. The flooded setting will probably use a higher voltage that would result in some gassing, so you'd eventually need to top them up, the sealed setting would use a lower voltage to reduce gassing to a minimum.
Click to expand...

I think this is exactly the case. If you can't top them up, choose "sealed" to minimise the amount of water the charger boils off.

Pete
 
From the advice I was given it could be that Little Ship has them the wrong way round.I have Numax sealed on my boat and the advice from the electrician was to have the charging on my Sterling Alternator Management gizmo set at the 14.4 v setting.
He said flooded could be set to the greater setting.
 
LittleShip said:
My charger has the ability to set for sealed and flooded, if memory serves me right.....
Sealed charges at 14.8
Flooded charges at 14.4

They are sealed so set up as that, it won't do any harm to these batteries if you chose the wrong setting.
Click to expand...

Sealed would charge at 14.4V and flooded at 14.8V.

If in doubt, set at the lower voltage. If they can be topped up, use the higher, and check them every month for fluid.
 
Looking at a picture of the Numax, almost certainly you can pry up the strip with the Numax label on it and then you will be able to top up. My Exides are very similar. There is even a slot at one end to put a thick screwdriver blade in to lever it.
There is long standing confusion over the word sealed.
"Sealed maintenance free" as in this case means a flooded battery intended not to need topping up during its lifetime. That's usually subject to a charge voltage limit, normally 14.2V these days with lead calcium batteries such as the Numax. There's really no difference between this and one with vent plugs, "maintenance free" is really a marketing invention and a by product of modern alloys that gas less.
"Sealed lead acid" is now more often called AGM or VRLA, is not flooded and cannot be topped up. (Gel can also be called VRLA but is different from AGM.)
So it depends which way your controller manufacturer is using the word. Does the documentation clarify that, or say what the voltage levels are for each setting?
After confirming that the top strip is indeed removable to top up, I would use the flooded setting.
 
You must log in or register to reply here.

Other threads that may be of interest

W
Battery suicide
Replies
17
Views
579
Refueler
Refueler

Share this page

Top