Question about Generac Electrical Supplies

1 Answer

Output voltage drops when loaded - Generac Electrical Supplies

Posted by on

  • 2 more comments 
  • gEEkDave Feb 16, 2014

    Here are the details.

    The generator is rated at 5000 watts, 6250 watts max.

    It has a 10HP engine.

    The engine runs fine and the output voltage is fine when unloaded, but the voltage drops from 120V to below 100V with a 1000 watt load.

    At first I thought I had loss in the extension cord I was using, but I connected a portable heater straight to the outlet on the unit and took these measurements.

    The engine RPMs drop briefly when the load is initially connected, but recover within a second or two. Even after recovery the voltage is this low.

    I want to power the electronic ignition and circulator pump of our home furnace, but the ignitor draws alot of power causing the voltage to drop and tripping a safety in the furnace's electronics.

    Here are the details.

    The generator is rated at 5000 watts, 6250 watts max.

    It has a 10HP engine.

    The engine runs fine and the output voltage is fine when unloaded, but the voltage drops from 120V to below 100V with a 1000 watt load.

    At first I thought I had loss in the extension cord I was using, but I connected a portable heater straight to the outlet on the unit and took these measurements.

    The engine RPMs drop briefly when the load is initially connected, but recover within a second or two. Even after recovery the voltage is this low.

    I want to power the electronic ignition and circulator pump of our home furnace, but the ignitor draws alot of power causing the voltage to drop and tripping a safety in the furnace's electronics.

  • gEEkDave Mar 19, 2014

    The RPMs are fine. They dip momentarily when the load is applied, but recover quickly. I'm thinking that perhaps there is a voltage regulator of some sort and it is not working?

  • gEEkDave Mar 19, 2014

    Increasing the RPMs does increase the voltage, but as I understand it, the RPMs are supposed to remain the same regardless of load.

  • tebrown507 Mar 19, 2014

    That is partially correct. The generator will momentarily slow when a load is applied. The larger the load, the bigger the effect. If the geneator RPM can be increaded while running under load to produce the rated output voltage, then it needs a high spped adjustment to raise the RPM when running under full load. My gnerator has an adjustment screw for this.

×

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 415 Answers

Make sure the engine RPMs are at full throttle under load or this will happen. Try connecting up a volt meter and your load, then manually reving up the motor. You shuld see the voltage rise to 120 - or above.

If so, the carbureator needs cleaning and adjustment.

Posted on Mar 12, 2014

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Output of generator is lower voltage than it should be usually 440v now 395v? reasons?


possible that the rpm of the gen set is lower than normal
there is an adjustment screw that adjusts the spring tension for the governor and it can be adjusted to bring the voltage back to normal
Note here--- if you run the set with a load of around 1/2 capacity set the voltage to on the 440 volts
if you run it at near capacity set it above voltage (445) because as it comes under load the rpms drop and the voltage comes back to normal

Nov 08, 2016 | Electrical Supplies

1 Answer

Voltage gauge drops alternator squeals. When using plow


INSPECT BATTERY ELECTROLYTE LEVEL
INSPECT BATTERY CABLES/TERMINALS
LOAD TEST BATTERY,_______VOLTS @ 150 AMPS (Min SPEC 10.2 VOLTS @ 150 AMPS.)
INSPECT BELT(s),
TEST ALTERNATOR OUTPUT (ON THE VEHICLE,'NOT' BENCH TESTED),
1 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW not ENGAGED
2 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW ENGAGED ALT OUTPUT SPEC ????

Feb 04, 2014 | GMC Sierra Cars & Trucks

1 Answer

98 ford explorer on 3rd alternator, all do same thing. Charge at 13.5v until you add a load such as lights or fan, then voltage drops off. I have 2 wires going into the regulator. one has battery voltage...


I guess my first question is what does the voltage drop to ?
Normal output would be 13.5 at idle with no accessories on. Then less as you add accessories if you continue at idle speed.
Once you raise RPM above 1500 you should gain output back up above 13.5 volts.
You have a yellow white wire that is fed from the same circuit as the large black orange wire. The small green red wire is coming from the gauge or warning light and it will be less than battery voltage.

Aug 29, 2013 | 1998 Ford Explorer

1 Answer

Voltage drop in b+


Check the horizontal output transistor for collector to emitter leak. Check this site for more details.

Feb 02, 2013 | Sanyo Televison & Video

1 Answer

AC voltage is 275vac on the powermate generator model # PM069250......engine speed is 3750 rpm (max is 3600 rpm)......how do i lower the speed and the 275vac to a nominal 240vac output.There is no expert...


On the engines carb. is a governor rod should connect to the front case of the engine. This rod should have an adjustment to slow the engine speed. BUT,,, are you reading the generator unloaded or without any thing plunged into it? Once you have the generator loaded with a device, the voltage should drop to a constant 240vac. 150 rpms should not make that big a difference on the voltage output, and if running under load the RPM's should drop also..

Sep 04, 2011 | Acabion Helix Motorcycles

1 Answer

Hello, my Briggs & Stratton generator, PP5000, Intec, 8 hp, Model 202412, type 0167E1, has lower power output, 180 Volts in stead of 220-230 Volts. Any idea where I should look ? Engine is 8 years...


Hi and welcome to FixYa. I am Kelly

Usually when you have a lower voltage output that is yet above 150 VAC the problem is as simple as the engine is no longer running at full speed. This could be caused by binding carb or governor linkages but more often than not the Governor adjustment screw has backed off over time causing the engine to gradually slow so the output voltage drops. The user does not notice it so much until the output drops more than 15% and you notice dim lights... slower running equipment etc.

Look for a circular plate / governor speed plate near the base of the governor lever but off to one side that has a spring that attaches to the governor lower end of the governor. There should be a screw with a locking nut. Loosen the nut and turn the adjusting screw clockwise to increase engine speed. (You may have to barely loosen the pivot nut on the governor speed control adjustment plate to make the speed adjustment.... tighten when done with speed adjusment) Watch your output voltage and adjust the voltage to 225 VAC with NO LOAD. The voltage will drop as loads are added. Make sure to tighten the lock nut on the adjusting screw or in a matter of an hour you will have low voltage again from engine speed dropping. What ever you do.... DO NOT adjust the governor arm base attach point where it attaches to the engine.

Just so you know a weakened governor spring can cause the speed drop also. If the speed keeps dropping with extended use, you may have to change the spring that goes from the lower end of the governor arm to the governor speed adjustment plate.

Thanks for choosing FixYa,
Kelly

Apr 20, 2011 | Briggs & Stratton 3,250 Watt 6.5 Hp...

2 Answers

What is the cprimary load on a 12volt to 240 volt 300watt inverter


Ohm's law tells us that: volts = amps x resistance and watts =volts x amps. Watts (300) = volts (240) x Amps (?); or 300 / 240 = 1.25 Amps That means the inverter can supply up to 1.25 Amps to a 240 volt load.

The primary is 12 volts, this is just 1/20th of the secondary 240 volt output. Since the best you can ever get is 100% efficiency -this means you'll need to supply 20 times the current. 1.25 Amps (at 240V) x 20 = 25 Amps (at 12V). As a check, from above Ohm's law that states Watts=Volts X Amps we get: 12VDC x 25Amps = 300Watts. Check!

Some side notes. The Ohms law used above is for DC circuits and purely resistive loads on AC circuits. I do not know what your 1.25 A @ 240VAC load is - but I suspect it won't be purely resistive. Also, since we're working with an electronic inverter as opposed to a transformer and DC rectifier there are some things that push losses higher. You might need to provide a 30 Amp 12 VDC source voltage in order to provide the 1.25A @ 240VAC output. Lastly, I wouldn't not run the output at maximum for long periods of time - or at all. 1 Amp @ 240VAC would be much better.

I hope this answered your question & good luck! Please rate my reply - thank you.

Mar 09, 2011 | Electronics - Others

1 Answer

I have a Yanmar 4.5 KVA Generator running into a Trace 2.5 KVA inverter/charger, the inverter requires 205-220volts to operate,once the inverter connects the voltage drops on the genny over a ten second+-...


try adjusting the gen voltage at no load to run at 240 volts
when the load comes on it will drop back to 220-235 volts
check the load output from the inverter as 2.5 kv is nearly 80% of the genset duty cycle
4.5 KV is start up KV and the duty KV is around 3..8 kv not the plated 4.5 kv
to get constant 4.5 kv you will need a 5.5-6 kv unit
if the current draw from the inverter is excessive , the engine may not have enough in reserve to over come the load and will not pick up the rpms
take the gen set and the inverter to a shop that has a calibrated load bank to test accurate power output to determine if the engine needs an overhaul

May 28, 2017 | Electrical Supplies

1 Answer

7 hp brigs engine on my generator runs two fast producing 127 volts. how do I slow it down?


Hi and welcome to FixYa. I am Kelly. Since you did not mention the make or model number of your generator I will respond in generic terms. If your generator is at 127 volts with NO load it is adjust at the very top end of the manufacturers limits. There is a 10% tolerance so 120 VAC + 12 is 127 VAC. Under an electrical load above 500 watts the generator should drop the output voltage slightly so your generator would still be within factory limits. Personally on any generator as a repair person; I set the output voltage at 126 VAC no load so that when the user puts the generator to work the output voltage is good. If your generator is running at 127 VAC under load then you can adjust the governor screw on the governor plate CCW about 1/2 turn to drop the voltage. Without a generator model number or engine number I can not tell you exactly where the governor plate is on your engine / generator. The screw will have a lock nut that you must loosen 1/4 turn then turn the adjustment screw CCW to drop the voltage. Just make sure to re-tighten the lock nut when the adjustments are complete. Mind you by decreasing the output voltage you also drop the output freqency at the same time you decrease the output voltage. It is better to have 125 -127 VAC under a no load condition as the more electrical load you add the more voltage drop you will notice. It is best to adjust the generator to 122.5 -123 VAC under a medium load. (50% of output capacity) A bread toaster is 1400 - 1600 watts and is a good load for a 3000 watt generator. Also a good hand held hair dryer will use around 1600 watts. If you use this type of load and the voltage output is 122.5 to 123 VAC I would not adjust anything. I have been working on generators since 1970 so this is nothing new for me. I hope that you understand everything I posted. If not, feel free to ask as many questions as you wish in any future response.
Thanks for choosing FixYa,
Kelly

Jan 08, 2011 | Craftsman Electrical Supplies

1 Answer

Volt gage drops when not accelerating, replaced battery and altenator, its running worse now


What are the voltage readings?
Voltage may drop when idling and a larger voltage drop can be present when a large load (amp draw)is present on the alt.
A low charged battery is a large load.
Operating accessories is a large load.
A slow spinning (idling) alt will not put out it's max output.
This would be normal.

We like to see.....above 12.7V at idle....max 15V.......
.......and a min of 13.5V to a max of 15V at higher engine speed.
If you are with-in this.......don't worry about it.

Aug 27, 2009 | 1992 Buick Century

Not finding what you are looking for?
Electrical Supplies Logo

Related Topics:

120 people viewed this question

Ask a Question

Usually answered in minutes!

Top Generac Electrical Supplies Experts

 Kenneth
Kenneth

Level 2 Expert

50 Answers

Ottoniel

Level 2 Expert

202 Answers

JOHN LAPIER

Level 3 Expert

2428 Answers

Are you a Generac Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...