I am wondering what charging
output do you acutally see on each of your twin Lestek 210As at an engine idle rpm
of say 1,250 rpm
(2,500 rpm alternator?), when your bank is discharged down, say 50%.
What current do you measure out of each alternator initially? After 15 mins? After 30 mins? After 60 mins?
I am thinking of substituting for my 90A Hitachi factory alternator on my new Yanmar
3JH5, a small case alternator nominally rated at 180A, and adding a secondary large case alternator on the other side of the engine that is rated nominally at 210A.
To mount the 210A I will try to use Yanmar's own secondary alternator bracket running twin 1/2" V belts, that they developed for a 130A.
The question is whether your 210A alternators are really a significant low rpm improvement over just adding a second small case 180A. Note, I am only interested in low rpm performance.
The manufacturer says to expect about 110-120A at 1,250 rpm in moderately hot engine comparment air after 30 mins for the 180A.
My other option is to wait for MasterVolt to work out an Alternator and Voltage Regulator combination suitable for fast charging
their new 320AH/12V LiIon batteries. But for safety
reasons I wonder if this will be a significant improvement over today's technology. It appears they will have a tight coupling between their alternator and battery
, that may conservatively throttle back charging.