I had an off-grid solar backup system installed with a 5kW inverter. When I connect my generator to the system to charge the backup battery, the inverter shows the generator delivering electricity at 63Hz (although the generator specs indicate it should deliver at 50Hz). This trips the inverter. Does anyone have advise? Can the generator be set to deliver at 50Hz? The idea was having a generator connected to backup system to charge the battery in the case of lack of sun or extended power outages.
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Ryobi 6900 5kVa generator
- Thread starter Adele
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TheChamp
Honorary Master
What inverter is it?
TheChamp
Honorary Master
Settings could be similar to Mecer/Axpert I think? Look for a setting where you choose between appliance or UPS and set it to appliance, it's reported to have made a difference for some people. Some also recommend plugging a load on the generator to stabilize the frequency.
It's setting #3 on the Axpert, could be the same with the Kodak.
The higher frequency means that the governor on the engine needs adjusting.
I'm not sure how that is done on the Ryobi but maybe you can get a service centre to adjust it for you?
If you're getting 63 Hz it means the engine is running at about 3800 RPM instead of 3000 RPM.
FYI:
Generator frequency (Hz) = (Engine RPM * Number Of Poles) / 120
Most petrol and small diesel generators use two pole alternators which means the engines need to run at 3000 RPM in order to deliver 50Hz.
A lot of bigger diesel generators have four pole alternators and run at 1500 RPM.
Inverter generators convert AC to DC and then back to AC with an inverter and therefore do not have to run at a fixed RPM.
I'm not sure how that is done on the Ryobi but maybe you can get a service centre to adjust it for you?
If you're getting 63 Hz it means the engine is running at about 3800 RPM instead of 3000 RPM.
FYI:
Generator frequency (Hz) = (Engine RPM * Number Of Poles) / 120
Most petrol and small diesel generators use two pole alternators which means the engines need to run at 3000 RPM in order to deliver 50Hz.
A lot of bigger diesel generators have four pole alternators and run at 1500 RPM.
Inverter generators convert AC to DC and then back to AC with an inverter and therefore do not have to run at a fixed RPM.
HartsockZA
Expert Member
The little Ryobi 950W has a screw just above the pull leaver so it must be someplace on the generator will see if someone in the states found it. Same design as some generator I have seen so yea let see what I can find apparently you'll need to adjust the governer or take it to a service center but like above said if she's pushing 63 on freq then engine is running too high on rpm
Last edited:
HartsockZA
Expert Member
Ok Cool, I managed to get my generator to work, as said above you need to adjust the governor on the generator which directly impacts the Generators freq. Mine was on 53Hz and did the exact same thing. I just adjusted it to 50Hz and now everything loads onto it beautifully UPS doesn't even flinch.
By default out of the box they adjust it to 53Hz if yours has the voltmeter (digital) then you can adjust it with no issues.