I have Yamaha EF2000iSv2 generator.When RV is hooked up to house A/C and just charging battery (with converter on) my handy dandy watt monitor shows it drawing less than 2 amps. If I connect RV to generator, I can run lights and heater, etc (approx 6 amps) with battery disconnected. However, if I turn off converter and have battery hooked up, with generator running, it stalls out if I then turn on converter breaker. Watt meter is still showing only 1.6 amps as the generator bogs down and stalls. Weird that this doesn't happen with battery disconnected and OTHER 12 volt stuff turned on!Any thoughts?? Ed

All AC circuits OFF. Only Main breaker and converter breaker. With ALL DC fuses removed, turning on converter breaker causes generator to stall (while watt meter showing less than 2 amp draw). Water Heater has it's own breaker/circuit.I'm suspecting 'tri-mode' converter.

Blue sky guess is that the charger is generating AC noise that the gen cannot handle. With your charger off connect a portable car battery charger and see if that works.

My buddy had the same problem with his Yamaha EF2000 and trying to start his PDI9260 charger. The camper next door came over and offered him his Honda eu2000i - which had no problem with the load.When he got home, I brought my eu2000i over and we did a number of tests starting various high load items (AC, toaster oven) with both gens. Each and every time my Honda would start them without struggling, even on Eco, but the Yamaha wouldn't do it. The Honda's are known for their extreme surge capacity. They've been measured putting out twice their rated current. The Yamaha just can't do the same.

try taking the generator off eco mode and check the batteries to make sure they are full of water. How old are the batteries it might be that some of the plates inside the battery are touching each other and causing to much draw on the gen set

generator stalls when converter tries to charge battery

hiker108
Explorer
Oct 02, 2019
UPDATE: I called WFCO and described the problem. Their tech guy said that it is NOT problem with the converter. SO, I will proceed to check out Yamaha generator.
time2roll
Nomad
Oct 01, 2019
Why do all the convoluted switching battery and pulling fuses?
Make sure the big stuff(air, mw, wh) is off and just plug in and let it rip.
djousma
Explorer
Oct 01, 2019
hiker108 wrote:
I have Yamaha EF2000iSv2 generator.

When RV is hooked up to house A/C and just charging battery (with converter on) my handy dandy watt monitor shows it drawing less than 2 amps.

If I connect RV to generator, I can run lights and heater, etc (approx 6 amps) with battery disconnected. However, if I turn off converter and have battery hooked up, with generator running, it stalls out if I then turn on converter breaker. Watt meter is still showing only 1.6 amps as the generator bogs down and stalls. Weird that this doesn't happen with battery disconnected and OTHER 12 volt stuff turned on!

Any thoughts??

Ed

Ed,

I see from your signature that you are in Colorado? At what altitude? Most of the generator manufacturers offer a high altitude kit that is just a leaner carb jet. Its not uncommon for any generator to make less power at the higher altitudes.
CA_Traveler
Explorer III
Oct 01, 2019
I would also suspect the Wfco as they are lower end not so great chargers. However it could be that either one or both together are the problem in that the design is marginal in terms of generating a "good" sine wave or rejection of a "not so good" sine wave. With the battery connected apparently the Wfco acts differently and the gen stalls. I suggested AC noise which can be viewed with the right equipment.

ScottG posted some tests indicating it just might also be your gen.

At any rate there are many posts concerning Wfco poor battery charging.
hiker108
Explorer
Oct 01, 2019
Thanks for all the responses. I DID run a portable car battery charger from the Yamaha generator to charge the battery directly and it did fine! The battery was new a few months ago. With the battery disconnected and the Yamaha connected, I can run all AC and 12 volt appliances no problem. So, I'm not suspecting the generator. It is only when I have the battery hooked up that the generator stalls when I turn on the WF-8955PEC converter.
whiteeye42
Explorer
Oct 01, 2019
try taking the generator off eco mode and check the batteries to make sure they are full of water. How old are the batteries it might be that some of the plates inside the battery are touching each other and causing to much draw on the gen set
ScottG
Nomad
Oct 01, 2019
My buddy had the same problem with his Yamaha EF2000 and trying to start his PDI9260 charger. The camper next door came over and offered him his Honda eu2000i - which had no problem with the load.

When he got home, I brought my eu2000i over and we did a number of tests starting various high load items (AC, toaster oven) with both gens. Each and every time my Honda would start them without struggling, even on Eco, but the Yamaha wouldn't do it.

The Honda's are known for their extreme surge capacity. They've been measured putting out twice their rated current.
The Yamaha just can't do the same.
CA_Traveler
Explorer III
Oct 01, 2019
Blue sky guess is that the charger is generating AC noise that the gen cannot handle.

With your charger off connect a portable car battery charger and see if that works.
hiker108
Explorer
Sep 30, 2019
All AC circuits OFF. Only Main breaker and converter breaker. With ALL DC fuses removed, turning on converter breaker causes generator to stall (while watt meter showing less than 2 amp draw). Water Heater has it's own breaker/circuit.

I'm suspecting 'tri-mode' converter.
bgum
Explorer
Sep 30, 2019
What is water heater on?

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generator stalls when converter tries to charge battery

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