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Old 27-09-2014, 10:35   #31
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Location: Santa Eulalia, Ibiza
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Re: Installed Battery Capacity

To add,
Undercharging, Most chargers come with poor defaults & people are conservative with charge time, A long absorb as long as it is temp compensated and voltage is not too high is good for the batteries, It stirs the electrolyte preventing stratification and keep the pores of the plates clear, combating Sulphation lessening need for EQ, You need to keep a close eye on water usage, But that is the only down,
EQ, What is it and why ? A controlled over charge to equalise the SG's of the cells, Why ? Two reasons, Batteries are "bullies" In a battery you have minimum of 6 cells, one cell is always a little weaker than the rest, every cycle the weaker one gets a little weaker, As a battery is only as strong as it's weakest cell, That's where your capacity go's,
Stratification, In a low use / poorly charged battery, the heavier "acid"will sink to the bottom causing plate erosion poor performance & false SG readings, EQ "stirs" the electrolyte,
Sulphation, The formation of sulphate crystals on plates bocking pores, Caused by under use, EQ " Knocks" the crystals off, If the battery is chronically under used or a float battery, A heavy discharge then charge @ %15 of 20h rate before EQ'ing is recomended

Thats all for now :-) hope this helps someone, Have a good one,
Tim
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Old 27-09-2014, 11:25   #32
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Re: Installed Battery Capacity

Quote:
Originally Posted by blackswan555 View Post
....... Sulphation, The formation of sulphate crystals on plates bocking pores, Caused by under use.....
Sulfation happens on "every" charge discharge cycle and is not caused by "under use". Lead Sulfate crystals are formed as a natural chemical reaction when batteries discharge. When charged most of the the Lead Sulfate returns to Lead and Lead Oxide and the "Sulfate" part recombines with the water in the electrolyte to strengthen the SG of the electrolyte. Permanent sulfation, where the Lead Sulfate crystals harden and cannot be removed even by Equalisation, is a result of under charging, not under use.

All Lead Acid batteries should be recharged to a proper known "100%" as soon as possible, if this is not done every 2-3 weeks they should be Equalised. Lifeline and FullRiver sealed AGMs CAN be Equalised.
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Old 27-09-2014, 11:29   #33
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We have 420ah * 24v (like 840 @ 12v).

I would increase it if I could. It would be nice to get 24 hours between genset runs.

We have a lot of electrical equipment on board and don't particularly conserve. With a quiet heavy duty genset, the generator runs are not really a bother, but still. The main problem is running the heat, which uses about 300 watts with all the fan coils going. In combination with the other loads (like inverter running 24/7), that will run the batts down fairly quick.
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Old 27-09-2014, 11:56   #34
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Re: Installed Battery Capacity

Sorry under use was the wrong term, A sulphated battery is one which has been left standing in a discharged condition or undercharged
to the point where abnormal lead sulphate has formed on the plates. (or had plates exposed to air)
Tim
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Old 27-09-2014, 12:12   #35
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Re: Installed Battery Capacity

1400Ah LiFePo @12V.

No problem drawing 300+A for short times (less than a few minutes).
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