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Charging voltage for Dyno battery | 15 comments (15 topical, editorial)

Re: Charging voltage for Dyno battery (3.00 / 0) (#13)
by AbyssUnderground on Sat May 3rd, 2008 at 04:04:11 AM MST
(User Info) http://www.repowered.co.uk

I have a 12v 90Ah SLA for my system and although I've been reaching float every day this week, a 0.5A load will drop it to about 12.8-12.9v instantly. This does mean its not fully charged and an extended float period is needed.

Be aware these batteries weight 28KG as well. If your back is dodgy, don't try lifting it!

The rating for this battery is C/20, which is 4.5 Amps. I don't think I've ever really used more than 1.5A total except when running my inverter from it so it does very well capacity wise.

http://www.repowered.co.uk - My Renewable Energy site.
msn[at]m3ezw.co.uk - my msn if you want a chat.

Re: Charging voltage for Dyno battery (3.00 / 0) (#14)
by Flux on Sat May 3rd, 2008 at 02:19:56 PM MST
(User Info)

You will never get a battery to hold above 12.9v with any sort of load at all. That is fully charged and whatever it is floating at it will drop virtually instantly if you pull off the surface charge.

This is why you can never measure state of charge when charging floating or discharging. You can only measure this when the surface charge is removed. Standing for a minimum of 6 hrs or after a minute or so of discharge with a modest load. Even 12.9 is on the high side but some calcium based VRLA's can just make it. Typical full charge for most flooded cells is about 12.8V.

Flux

[ Parent ]

Re: Charging voltage for Dyno battery (3.00 / 0) (#15)
by Speo on Sun May 4th, 2008 at 12:55:11 PM MST
(User Info) http://www.windpulse.com

Abyss, I noticed the same thing you are describing. Applying a load after reaching the floating stage, was dropping the voltage to 12.8, then it was slowly going down, at a much lower rate.

Based on Flux's explanation, that's a normal behavior. We were doing better than we think. I'm glad it's not proved the other way around.

Thanks Abyss and Flux for the input.

Speo

[ Parent ]

Charging voltage for Dyno battery | 15 comments (15 topical, 0 editorial)

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