Jewish: Your oil should last eight days. Thank you,
G-d for draining our old oil out of Egypt.
Catholic: Only a priest can add oil to your machine.
Jehovas Witness: We'll send two nice young men with
watchtower tracts to add oil for you.
Pentacostal: We'll have your machine oiled up, and
dancing in the aisles.
Quaker: We'll send a bearded man in a dark suit to
check and add Quaker State oil to your generator.
Mormon: Any worthy Melchizidek priesthood holder can
add as much oil as needed.
Muslim: We'll sell you more motor oil, but you will
later be required to convert to Islam.
I just re-read the manual and there's nothing, either way, about
the charging circuit for the battery.
It should be described in the weekly "exercise" or "battery maintenance"
sections, but it's not.
Also, if there is a charging circuit, it's not obvious in the schematic
diagrams. If there is the requisite 240VAC to ~15VDC "charger", that's
not obvious in the machine either - as the control circuitry is pretty
simple (one small circuit board for the entire generator).
So, while I "doubt" that the battery is charged by a power supply
connected to the 240VAC (or even the 120VAC half), the question deserves
a definitive answer, which I will get from Generac and report back.
In general, when there is no rain, the power is stable.
When there is rain, the power goes out once a month (on average).
Of course, it has gone out three times in December alone, so that's
just an average.
I left a message at Generac for them to tell me whether the battery
is charged by the AC mains or by the generator running weekly for
I can't say about yours, but of all things I bought a 5 kw generator several
years ago that has a nicad type battery. It came with a wall cube type
charger that I have to plug into the wall to give a slow charge to that
I had another 5 kw generator that would not start so that is the reason for
the other one. Finally got it started as the carborator was gunked up. As
I never started or put gas in the new generator , I just took the battery
out of the generator and put it in storage. I do charge it every so often
from the wall cube.
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On Friday, December 19, 2014 9:19:21 PM UTC-5, email@example.com wrote:
A fully charged battery is 12.6V, without anything connected. If he's
seeing significantly higher than that, then I agree it's definitive that
it's being charged. However if he sees just around 12.6V, I don't think
it necessarily proves it one way or the other. Assuming it has a
charger/maintainer of some kind, we don't know how exactly they work.
IDK even how a BatteryTender, which has some smarts in it, works. It
allegedly only charges as much as necessary, so it could monitor, test,
and you'd only see the voltage raise during periods when it's actually
As to Danny's generator, I tried to find a service manual for it, but
couldn't find anything. The experience I have with Generac is a similar
generator that was built about 10 years ago. It definitely had battery
charging circuits that were driven off both the line AC and the generator,
if running. While trying to fix that one, I had the service manual.
I would think that's how Danny's would work too, for obvious
reasons. But IDK and you'd need a service manual, schematic, etc to know
for sure. I'm not sure I'd even trust the Generac people, as you'd think
a help line would have obvious answers like that at their finger tips.
They couldn't even tell him whether the spark plug cables were "bolted"
on to the spark plugs, so I wouldn't put much faith in them.
If I was D, I'd obtain the service manual, not just the operating manual,
for future reference.
On Sat, 20 Dec 2014 06:04:39 -0500, Stormin Mormon
Yes, 13.2 12.6 is the theoretical open circuit voltage of a lead acid
battery, but some alloys are slightly higher. 12.7 or 12.8 is quite
common on a searled recombinent absorbed glass mat battery. Any kind
of charge at all will wxcede 13.2 volts.
On page 12 of the manual, the diagram at the left side of the page shows
a Battery Charge winding connected to a rectifier. One side of the
winding goes to the Control Logic PCB. Output of the rectifier goes to
a fuse, and then to the battery. There is also a connection to the
Control Logic PCB via SW2A.
So the battery is apparently charged when the generator is running. It
is not clear if it is also charged through one of the three transfer
switch connections. SW2 may be an option you can set to allow that, but
I did not see any mention in the manual.
Fred McKenzie wrote, on Sat, 20 Dec 2014 14:16:45 -0500:
Thanks for confirming that information from the schematic in the
For others to see that schematic, I've converted the entire 32
page PDF manual to JPG using the following Linux command:
$ convert -density 300 generac_9067-9.pdf generac_9067-9.jpg
While all 32 pages were uploaded, the specific page 12 Fred speaks
about is located at the URL below (rotated sideways for convenience):
Apparently some Generac models do charge the battery when running and
others do not. My manual states:
The generator is equipped with a battery trickle charger that is active
when the unit is set up for automatic operation. With the battery
installed and utility power source voltage available to the transfer
switch, the battery receives a trickle charge while the engine is not
running, to prevent self-discharge. The trickle charger is designed to
help extend the life of the battery by maintaining the battery when the
unit is not running. The trickle charge feature cannot be used to
recharge a discharged battery. No battery charging occurs when the
generator is providing power."
Sorry I assumed that your 8KW unit charges the same as my 7KW unit.
Apparently it does not.
On Saturday, December 20, 2014 5:22:56 PM UTC-5, Danny D. wrote:
I agree with Fred, it's not clear from the schematic what's going on.
But like he says, SW2 is involved in the schematic. It's also listed
in the table there with a 3 word description "set .... switch". I
can't make out the middle word. Presumably on the original that you
have you can read it?
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