19-07-2020, 09:22 AM
Adjustable resistances are always a bit tricky as the watt rating is generally for the whole or most of the resistor not just part of it, for which it is more or less proportional.
Adjustment of the 3rd brush is preferable as there is no associated power loss.
To manipulate really need a voltmeter; a zener necessary to expand the scale. Very cheap LED indicators are available.
For most now a modest Summer rate used in conjunction with a smart bench float charger is probably the ideal, esp if the battery is CaCa. For 400 mile day trips on the later cars the field fuse can be removed to stop charging for periods.
Adjustment of the 3rd brush is preferable as there is no associated power loss.
To manipulate really need a voltmeter; a zener necessary to expand the scale. Very cheap LED indicators are available.
For most now a modest Summer rate used in conjunction with a smart bench float charger is probably the ideal, esp if the battery is CaCa. For 400 mile day trips on the later cars the field fuse can be removed to stop charging for periods.