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Showing results 1 to 17 of 17
Search took 0.00 seconds. Search: Posts Made By: Tasso
Forum: Electrical: Batteries, Generators & Solar 06-05-2017, 08:26
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

This would suggest an internal impedance of about 130 milli-ohm over the remaining 5 internal cells - which is ridiculously high. While the failed battery would be in rapid charge mode and internal...
Forum: Electrical: Batteries, Generators & Solar 27-04-2017, 03:53
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

So I think I was clear that this has not happened on my boat. I have talked to two people that have seen it. One an owner - one a technician who resolved one. In both cases the scenario was actually...
Forum: Electrical: Batteries, Generators & Solar 26-04-2017, 14:40
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

This is amusing but I can't remember if anyone actually answered your question...

To use the batteries you suggest you will need 6 of the 450Ahr batteries. They will need to be configured in...
Forum: Electrical: Batteries, Generators & Solar 26-04-2017, 11:40
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

Rod my concern is your level of confidence in your position - which in fairness several posters have issue with. I challenge to you refute the science in my last post. I agree that the parallel...
Forum: Electrical: Batteries, Generators & Solar 26-04-2017, 08:03
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

Some science - weak batteries typically have higher internal resistance. In parallel - most of the charging current goes to the strongest batteries. In series voltage across weakest battery is...
Forum: Electrical: Batteries, Generators & Solar 25-04-2017, 10:10
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

Condescending means dismissing the opinions of others with sarcasm.

Your experience and opinions differ. That is the sum of it.
Forum: Electrical: Batteries, Generators & Solar 25-04-2017, 09:14
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

Guess that you're stressed at the coffee shop - but your comments are a bit condensing.

We are not stupid. We just have a different opinion.

There are trade-offs for any configuration.

BTW -...
Forum: Electrical: Batteries, Generators & Solar 24-04-2017, 16:23
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

Actually the remaining non-shorted cells contribute 10v of emf to the circuit - the actually power dissipation is 200 watts plus whatever your charging system is throwing at it. Bad time to connect...
Forum: Electrical: Batteries, Generators & Solar 24-04-2017, 07:29
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

I wonder if you have ever been on a multi-day passage. On the open ocean one acquires all sorts of "irrational phobias". I'm happy to admit this but I expect to live longer by showing respect for...
Forum: Electrical: Batteries, Generators & Solar 24-04-2017, 07:17
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

I have seen otherwise. I do not consider trusting my life to the internal resistance of my batteries a good life choice.
Forum: Electrical: Batteries, Generators & Solar 24-04-2017, 05:08
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

With two batteries in parallel - one with a shorted cell - say one at 12v one at 10v - the battery with the higher voltage will provide full current in an attempt to bring two batteries to 12v. The...
Forum: Electrical: Batteries, Generators & Solar 24-04-2017, 00:46
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

This statement is false.

The biggest risk of melt-down, explosion or potential fire, occur from rapid discharge. Rapid discharge is more likely when batteries are connected in parallel.


...
Forum: Electrical: Batteries, Generators & Solar 23-04-2017, 11:11
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con

I don't want to get into a piss fest - but it's interesting than an article that I wrote for Good Old Boat was turned down because they no longer want to publish advice on battery configuration...
Forum: Electrical: Batteries, Generators & Solar 23-04-2017, 11:07
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

Agreed - ABYC recommends each battery bank be protected by a fuse or breaker. I have 200 amp breakers.

I have been entertained by the battle on this tread - but find it odd that people can be so...
Forum: Electrical: Batteries, Generators & Solar 23-04-2017, 10:21
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con

No one is advocating leaving shore without at least two fully redundant banks. But individual cells within a 12v or 6v battery can and do occasionally short. Given that a 12v battery is just six 2v...
Forum: Electrical: Batteries, Generators & Solar 23-04-2017, 10:05
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

I have only heard of one - single cell short in a 12v battery. It is not common but catastrophic. Why take the risk when two 200Ahr 6volts are cheaper than two 100Ahr 12volts?

Should be an easy...
Forum: Electrical: Batteries, Generators & Solar 23-04-2017, 09:57
Replies: 398
Views: 36,849
Posted By Tasso
Re: Wiring In Series (pro vs con)

Series is ALWAYS safer than parallel for this reason. In a parallel configuration - one shorted cell can cause battery explosion or worse. In my boat my two series banks are only in parallel for an...
Showing results 1 to 17 of 17

 
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