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Home > Archive > Alternative Power sources > November 2005 > 12v Generator
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| Hi all, I made a 12v gen (4hp eng, car alt, & a 12v car battery).
I use it to run a 120v battery charger off a cheap 1000w inverter.
(as apposed to charging batterys directly off the 80amp alt).
While running without the inverter the volts are 14.7 - 14.9, when
I start the inverter most times the voltage spikes to over 15 volts,
shutting down the inverter @ more than 15v. So I figured bad battery,
or crappy regulator inside the alt. Had a battery isolator laying
around and remembered you lose .5 or so of a volt going through the
isolator. Put the alt to the isolator and the battery off one of the
legs.
Still with me? Anyway, now I get a steady 14.6v at the battery, When
the inverter starts up the volts drop for a second or so, then come back
to 14.6, no over voltage to shut down the inverter. But now at the alt
term I get 15.5 volts. Is this the max the regulater inside the alt is
set at? Is this bad for the alt?
Rob
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"Rob" <beprivat@here.org> wrote in message
news:q7OdnWP0a-gWUureRVn-uA@rogers.com...
> Hi all, I made a 12v gen (4hp eng, car alt, & a 12v car battery).
> I use it to run a 120v battery charger off a cheap 1000w inverter.
> (as apposed to charging batterys directly off the 80amp alt).
>
> While running without the inverter the volts are 14.7 - 14.9, when
> I start the inverter most times the voltage spikes to over 15 volts,
> shutting down the inverter @ more than 15v. So I figured bad battery,
> or crappy regulator inside the alt. Had a battery isolator laying
> around and remembered you lose .5 or so of a volt going through the
> isolator. Put the alt to the isolator and the battery off one of the
> legs.
>
> Still with me? Anyway, now I get a steady 14.6v at the battery, When
> the inverter starts up the volts drop for a second or so, then come back
> to 14.6, no over voltage to shut down the inverter. But now at the alt
> term I get 15.5 volts. Is this the max the regulater inside the alt is
> set at? Is this bad for the alt?
>
I'm not too knowledgeable about the innards of alternators but 14.6V is
about the maximum for charging lead acid batteries. It tends to suggest a
faulty alternator or you have the connections to the alternator wrong
somehow.
--
Malc
"How dare you take advantage of MY blithering idiot!"
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"Rob" <beprivat@here.org> wrote in message
news:q7OdnWP0a-gWUureRVn-uA@rogers.com...
> Hi all, I made a 12v gen (4hp eng, car alt, & a 12v car battery).
> I use it to run a 120v battery charger off a cheap 1000w inverter.
> (as apposed to charging batterys directly off the 80amp alt).
>
Have a look at the 12V generator problem thread down there somewhere.
--
Malc
"How dare you take advantage of MY blithering idiot!"
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| Solar Flare 2005-11-15, 8:21 pm |
| Alternators will often charge at 15.6 vdc in cold climates.
Norminal cell voltage + 0.17% per degree C below 25C
"Malc" <malunspamwhhite@bluyonder.unspam.co.uk> wrote in message
news:cCsef.26824$Es4.19107@fe2.news.blueyonder.co.uk...
>
> "Rob" <beprivat@here.org> wrote in message
> news:q7OdnWP0a-gWUureRVn-uA@rogers.com...
> I'm not too knowledgeable about the innards of alternators but 14.6V is
> about the maximum for charging lead acid batteries. It tends to suggest a
> faulty alternator or you have the connections to the alternator wrong
> somehow.
>
> --
> Malc
>
> "How dare you take advantage of MY blithering idiot!"
>
>
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