SOHC.co.uk Forums > CB500/550
550F charge issue?
Sesman:
Wow, now that is good service. To be fair I did about 9k on mine over several years of ‘touring’ in the south of France and Spain, where it was effing hot. I’m sure that was a factor in the premature failures. In all other respects I wish i still had my 98 VFR. It was a superb machine and would hold its own today with similar machines. When I say ‘touring’ read beer induced duration TT racing. Nothing to be proud of, but great times sadly missed.
Bryanj:
The problem with the "electronic" ones is that they dont like either voltage spikes or reverse polarity. Now the reverse part can only happen by fitting the wrong battery or simply getting it wrong BUT i have seen, more than once, both done.
The voltage spike is far more common due to old and poor connections/ looms.
Personally i will use the original type until i cant get one
deltarider:
--- Quote from: Bryanj on March 05, 2023, 05:41:38 PM ---The problem with the "electronic" ones is that they dont like either voltage spikes or reverse polarity. Now the reverse part can only happen by fitting the wrong battery or simply getting it wrong BUT i have seen, more than once, both done.
The voltage spike is far more common due to old and poor connections/ looms.
Personally i will use the original type until i cant get one
--- End quote ---
And right you are. It was a German engineer who posted his findings on the German forum after having monitored and compared the OEM arrangement to aftermarket full electronic devices. He discovered the big resistor more or less 'senses' the ambient temperature - not so much the battery's temperature as I understood it - so in hot weather the charging is reduced somewhat, whereas in the cold, right after a cold start the charging is at max, because the resistor is still cold. I don't know how big the effect is and if it was designed on purpose by Honda or just a bonus of having that big resistor in the open.
Sesman:
I suspect it was an unintended consequence; the dominant impedance of a coil is reactance, which is unaffected by temperature. The resistance part of the coil however will change with ambient temperature changing the X/R ratio, which affects both Z (impedance) and the D.C. time constant….which will affect the regulator coil current and torque produced, effectively changing the rpm at which the regulator moving contacts are powered. I could say a little more about dv/dt and the relative effects of producing meaningful voltage spikes, but I suspect it might not be too useful.
McCabe-Thiele (Ted):
Call me a Luddite but the trouble with solid state stuff is there is no easy way to test it. (says he who has electronic ignition) no bits you can adjust to alter voltage.
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