Posted by Bob M on August 25, 2008 at 13:26:59 from (151.190.254.108):
In Reply to: H charging prob;lem posted by PetePequawketfarm on August 25, 2008 at 10:42:53:
John T said: Like Jim, Im NO FAN of the 8 volt system as a band aid approach to fix a problem which a good heavy duty battery and 00 Gauge cables might cure, especially on an lil H although Id cut a guy a lil more slack if it were an M lol[/quote:ef87d7e1d5]
I agree 100% John T(!)
John T said: A genny dont necessarily know its voltage, thats a function (in great part within limits) of how fast it turns plus how much current is pumped through the field windings. So....
1) If its a cutout relay I think it will still charge an 8 volt battery NO MODS NECESSARY (notwithstanding cut in/out voltage adjustment) although maybe not at any super high charge rate.[/quote:ef87d7e1d5]
Yup. A cutout system is not much insensitive to system voltage. A "6 volt " genny and cutout will charge an 8 volt (or even a 12 volt...) battery - though at a lower rate and a higher cut-in RPM.
John T said: (2) If it has a VR that has 2 coils and one (not the cutout relay) is a current controller ONLY, I think it will still charge with no mods (other them perhaps cut in/out voltage) cuz the current control relay can still do its job.
The 2 relay VR's I'm familiar with (Delcos on IHC and MinneMo stuff) combine both the current and voltage regulating funtions into a single relay. They're extremely difficult to field adjust correctly to work on 6 volts - for 8 volts they're virtually impossible to get right.
[quote:ef87d7e1d5="John T"](3) HOWEVER if its a 3 coil or 2 coil relay and the one relay is a VOLTAGE CONTROL RELAY (or a combination current n voltage relay on that second coil) I think it needs some significant adjustments (air gaps or spring tensions) to charge an 8 volt battery.
Yes again. Need to increase the spring tension on the VR relay to "bump" the regulating set point from around 7 volts to a tad over 9 volts. (My experience is this is easier said than done however....)
[quote:ef87d7e1d5="John T"] PS follow Jims advice about Polarity and be sure n polarize the genny and have a VR thats compatible with your ground polarity.
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