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(ET) charger voltage




I've been scanning through the archives, and also the Service Manual, and am seeing some mixed messages on this - what voltage should the charger be putting out to the batteries? Mine's putting out a shade under 40 V (39.5V or so), and they seem to not be holding as much energy as I'd like (T-105s that are a few years old, bought used). According to the Service manual, 40-45 V is ok (well, not on exactly the same wires as I'm measuring the voltage, I'm measuring across the battery pack, rather than at S3 and S1 directly on the charger, so there's presumably a small amount of voltage lost between the points the manual says and the points I'm measuring at, especially if some weak connections, such as at the Diode heat sink). According to the archives online, I've seen people saying that if the voltage isn't 42-45V, the charger won't fully charge the batteries enough (some people who replaced the capacitor when the charger was only putting out 39V or so, for example). With mine charging, the charge meter goes slightly into the white section - whereas in the archives, I've seen statements that if the meter doesn't go all the way to the high end of the white section, the batteries won't get a full charge. On the other hand, the Landis controller only has the charger on when the pack voltage falls below 38V, by default, unless you adjust it up. So, if charging to 38V will give you a full pack, then there's no need to have the charger putting out more than 39V or so (other than that the higher the voltage it puts out, the quicker the pack will charge). So, which is it? Is 39-40V from the charger ok, or should it be 42-45? Essentially it comes down to - what should be the voltage of a fully charged battery pack (I know it's higher than 36V, but how much?)?

Thanks,
Mike

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Michael S. Briggs
UNH Physics Department
(603) 862-2828
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