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Search took 0.00 seconds. Search: Posts Made By: Dockhead
Forum: Electrical: Batteries, Generators & Solar 02-06-2012, 17:07
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

Of course. Amp hours in and out is of very limited value. I go by voltage at low load (a proxy for open circuit voltage).

By the way, the batteries working very well indeed. They just supplied...
Forum: Electrical: Batteries, Generators & Solar 26-05-2012, 02:31
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

Thanks, Hud! I just lived with them for 24 hours without charging, and without having fully charged them to start with. They don't seem to be discharging faster than they used to. Got my fingers...
Forum: Electrical: Batteries, Generators & Solar 26-05-2012, 02:27
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

OK, thanks. I left them isolated for 10 hours yesterday. When I came back, they were showing 25.6 volts. I put a heavy inverter load on them -- a 2.5kW kettle, then a 1.5kW immersion heater. The...
Forum: Electrical: Batteries, Generators & Solar 26-05-2012, 02:14
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

My boat used to have two different "service"banks, with the windlass, winches, and thruster on their own separate bank. I combined these banks, which turned out to be a very good decision. But the...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 13:21
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

Thanks.

I was away from the boat for 20 days. I don't know when they reached the 8 volts at which I found them :( I would say it was a total, 100% discharge :(

This identical situation...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 12:55
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

I actually have one of these -- a good one which cost about $300. I am not entirely convinced of its accuracy. But I did test and log results for every one of the 8 new batts when I installed them...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 11:47
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

Thanks for that, Bill!

Thanks for confirmation about the method of measuring state of charge. Gives me more confidence. I will continue to do it that way. It seems to me that if this method...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 11:37
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

Umm, I think you're confusing charging voltages with open circuit voltages -- two very different things.

Trojan recommends charging at 14.8 volts (28.6), with periodic equalization at 15.5 volts...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 10:49
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

That's also my understanding.

But who while cruising can take all loads off for 24 hours? What do you think about my slightly loaded test? What do people really do in practice?
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 10:08
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

I think that's AT 14.8 volts, not TO 14.8 volts. I'm not talking about the charging voltage; I'm talking about the batteries open circuit voltage (or pseudo open circuit voltage) as a measure of the...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 04:54
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

Thanks, guys, for the sympathy! Such a PITA. I get back to the idea that battery banks should have a safety switch or battery management system which totally isolates them at the battery posts when...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 03:33
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

The inverter is part of the Victron integrated inverter/charger. I leave the Victron switched off altogether, and the 230V system likewise completely shut down. I don't think that could be it,...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 03:04
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

420 amp/hours at 24 volts.

I'm going to check the voltage drain with my DC clamp meter before I leave the boat the next time.
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 02:42
Replies: 36
Views: 5,186
Posted By Dockhead
Re: Dead Batteries -- Blast Them or Coddle Them?

Well, half an amp for three weeks is 250 amp/hours, more or less. The fridge was not on. Maybe there is some other leakage.

I don't know why the engine start battery was flat. It is totally...
Forum: Electrical: Batteries, Generators & Solar 24-05-2012, 02:14
Replies: 36
Views: 5,186
Posted By Dockhead
Dead Batteries -- Blast Them or Coddle Them?

Got back to the boat last night after three weeks to find every battery (3 banks) dead as a doornail. D**n! My house bank now consists of $2000 worth of brand new Trojans -- double d**n!

It...
Showing results 1 to 15 of 15

 
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