Daily Archives: Sunday November 6th, 2011

Battery problems – day two

Posted on Sunday November 6th, 2011 by dafdaf

Thanks to the answers of our readers, today I’ve done more tests on our batteries. I’ve tested all batteries while disconnected from the ship’s circuitry U1 is without load. U2 is with a 40watts load, measured after 30 seconds. Here come the facts:

Battery  |    U1    |    U2    |
---------+----------+----------+
Main 1   |  12.62V  |   9.19V  |
Main 2   |  12.72V  |   9.62V  |
Main 3   |  12.71V  |  10.70V  |
Main 4   |  12.52V  |  11.39V  |
Start    |  12.30V  |  11.79V  |

The main batteries are of the type: Effecta BTL-100 (specifications). These are 12V, 100Ah AGM batteries. The label says: cycle use: 14.4V-15V standby user: 13.6V-13.8V
The starter battery is a Vetus ‘marine’ battery of type lead-acid.

Our chargers were set as follows:
Windgenerator: off at 14.34V
Shore power: off at 14.40V (setting: ‘AGM’)
Solar charger: off at 14.30V, standby: 13.8V (setting: ‘GEL’)
Alternator: off at 13.80V, secondary regulation: 13.90V

For me this means that the chargers were set correctly and even a little too conservative. As the batteries say cycle, max. 15V – I could’ve set the solar charger to ‘AGM’ with a peak voltage of 14.70V. Hmmm. Any more input before I run off in search for new batteries tomorrow ?

Posted in Hardware, Learning for life, LosLocos, Rancho Relaxo, Work | 4 Comments

Lego construction site and dead batteries

Posted on Sunday November 6th, 2011 by dafdaf

I’ve got 56 minutes left, then my laptop will shut down. And I cannot recharge it, because the ship’s batteries are DEAD. Dead ? You say.  – Well, yes – it seems so. Today I disconnected every single of our 6 months old AGM batteries and measured the voltage. It was between 12.8 and 12.7 Volt. That’s not much but it doesn’t mean they’re dead yet. The thing is: If we charge them, the voltage goes up and down as if there’s no battery connected: If the sun shines, we’ve got 13.5 volts, if there are clouds, we’ve got 12.6. If I try to connect something power-hungry the voltage goes down from 12.6 or whatever it is to 10.5 volts in a few seconds. This doesn’t look too good.

What I cannot understand: How can those 4x 100Ah AGM batteries that are just six months old already be dead ? We were connected to shore-power many times and the batteries have never been ‘used’ much. – Our battery monitor NEVER showed a charge less than 60% – and this maybe one or two times. I really don’t get it. If any reader of this blog has an idea how I could check the batteries or do anything about this situation – all input is very welcome !!

Posted in Hardware, LosLocos, Pics, Rancho Relaxo, Work | 5 Comments