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happytiger · 1st Mar 2015, 4:15 am

The waveform does not matter since the moving iron meter is reading RMS.
The old chargers produced ecessive voltage,and will overcharge the battery if left connected .Like the older cars that had dynamo charging, batteries had a short life due to being overcharged. You need to limit the voltage to 13.8 to keep your battery in good order, with this voltage the current will reduce to a very small value. You can make a regulator with a 2n3055 transistor,and zener diode/s.

1st Mar 2015, 4:15 am	#48
happytiger No Longer a Member Join Date: Dec 2007 Location: Bristol, Avon, UK. Posts: 184	Re: 12V Charger The waveform does not matter since the moving iron meter is reading RMS. The old chargers produced ecessive voltage,and will overcharge the battery if left connected .Like the older cars that had dynamo charging, batteries had a short life due to being overcharged. You need to limit the voltage to 13.8 to keep your battery in good order, with this voltage the current will reduce to a very small value. You can make a regulator with a 2n3055 transistor,and zener diode/s.