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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > Charging time and charger output
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Thread: Charging time and charger output Reply to Thread
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Topic Review (Newest First)
03-07-2013 08:49 AM
norahs arc
Re: Charging time and charger output

You have received some excellent advice from the members here. There is one thing I will mention. Check with the battery manufacturer for charge rates and times. They should be able to supply information such as max voltage and max amps and times. They will also specify an equalization schedual with voltage and amp rates. (Equalization requirements vary between battery types and sizes.)
03-03-2013 08:46 PM
Maine Sail
Re: Charging time and charger output

Quote:
Originally Posted by outbound View Post
so basically fast charging is like the de sulfatization setting on some smart chargers? How about rate of discharge? Does running high load devices separately or together matter? In past always tried to avoid running them together if possible. Is that wrong?
It really depends on what batteries you have. Thick plate deep cycle batteries don't tend to deal as well with high loads as other types but this is more of a voltage drop issue to the equipment than overly detrimental to the batteries. Any load above your banks Ah capacity corrected Peukert will result in less Ah than the bank is rated for but a good battery monitor will keep track of this.
03-03-2013 08:44 PM
outbound
Re: Charging time and charger output

thanks to both you gentle men. you two know what you know.lets just hope I know what I don't know.
03-03-2013 08:38 PM
Maine Sail
Re: Charging time and charger output

Quote:
Originally Posted by btrayfors View Post
Good question.

I don't have any objectively verifiable evidence, but from "feeling" and from comments made by battery manufacturers who have collaborated in some of my research I believe there is reason to believe that charging the batteries as fast as they will accept current is good for them.

This may or may not be due to internal bubbling which could help avoid stratification of the electrolyte and, possibly, speed up the process of dislodging loose PbSO4 deposits on the plates.

Maybe MaineSail has a view on this.

Bill
I think having both types of charges available is often best. This can be especially true with thick plate deep cycle batteries where high charge current tends to build surface charges that don't penetrate the plates as effectively as a slow charge will.

The fast charge will "shake" things loose, limit stratification and with good voltage can help to minimize sulfation.

On the other side a good slow charge of a thick plate deep cycle battery is perhaps the best way to get it chuck full and push the charge deep into the plates. Mixing things like wind & solar with high amp charge sources can be a productive way to handle batteries..
03-03-2013 08:26 PM
outbound
Re: Charging time and charger output

so basically fast charging is like the de sulfatization setting on some smart chargers? How about rate of discharge? Does running high load devices separately or together matter? In past always tried to avoid running them together if possible. Is that wrong?
03-03-2013 08:02 PM
btrayfors
Re: Charging time and charger output

Good question.

I don't have any objectively verifiable evidence, but from "feeling" and from comments made by battery manufacturers who have collaborated in some of my research I believe there is reason to believe that charging the batteries as fast as they will accept current is good for them.

This may or may not be due to internal bubbling which could help avoid stratification of the electrolyte and, possibly, speed up the process of dislodging loose PbSO4 deposits on the plates.

Maybe MaineSail has a view on this.

Bill
03-03-2013 07:32 PM
outbound
Re: Charging time and charger output

realized I expressed myself poorly
?Assuming you start and stop at the same levels of discharge- does it matter how rapidly you discharge and charge the batteries as regards life of the batteries?
03-03-2013 07:21 PM
outbound
Re: Charging time and charger output

Maine Sail + btrayors. On related question
? Is it better to run the high electrical users ( frig/AC etc.) when the high charger ( high output alternator) is running or does it impact on battery life if recharge is via the sun panels and D400s.
Generally turn things off and check house battery bank time to time if using high utiliers . If it falls too much leave things off until it comes back but have no clear idea what's too much.
03-03-2013 02:55 PM
Faster
Re: Charging time and charger output

Here's one of the commandments on SN:

Thou shalt not argue with Maine Sail or btrayfors on matters marine electrical!

From both posts above it should be clear the batteries will not allow the math you cite to rule....
03-03-2013 02:46 PM
sstuller
Re: Charging time and charger output

I don't see a conflict here. From Noco's website their 3.6 amp charger will take 17.5 hours to fully charge a 100 AH 12v battery @ 50% DOD. Their 7.2 amp charger takes 12.5 hours. The charger with twice the output only reduces the charging time by .707 times 17.5 hours to ~ 12.5 hours (.707 is the inverse of the square root of two). So Noco is agreeing with you by saying there is a practical limit to increasing charger output. I'm just trying to quantify that limit. Thanks. Steve S.
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