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 ?