[RE-wrenches] Puzzle: Dryer does not work during FXR battery charging
Ray
ray at solarray.com
Mon Aug 17 15:06:00 EDT 2020
I'll third the recommendation of a larger generator. I quit trying the
tiny genset setup 15 years ago. My rule of thumb is the genset needs to
be 50% larger than the inverter rating (6kw for a 4 kw inverter) plus
the altitude derating. Here in Colorado, you pretty much need a 8 kw
genset with a 4 kw inverter. Besides altitude, most gensets do not run
right or put out clean power at full load.
I've recently found that fuel efficiency is not as bad as you might
think for the bigger gen sets running at 50% rating. The tiny bit of
extra cost and fuel consumption is a small price to pay for reliable
back up power.
Ray Walters
Remote Solar
303 505-8760
On 8/17/20 12:05 PM, Dave Angelini Offgrid Solar wrote:
>
> Many of these issues also were solved with an inverter that had gen
> support or load shave.
>
> Time for a new inverter or a generator that is twice the load wattage.
> This was common back in the day and as Steve said, some cases just
> can't be fixed. Another reason many have abandoned 12v
> inverter/chargers except for RV use.
>
>
> *Dave Angelini Offgrid Solar "we go where powerlines don't"
> http://members.sti.net/offgridsolar/ e-mail offgridsolar at sti.net
> <mailto:offgridsolar at sti.net> text 209 813 0060*
>
> On Mon, 17 Aug 2020 10:54:11 -0700, Steve Higgins <steve at surrette.com>
> wrote:
>
>> Wrenches,
>>
>> When the inverter charger charges the battery bank and runs loads
>> this can affect the harmonics of the generator output.
>>
>> Not much you can do about it other than putting in a larger
>> generator to handle the inverter/charging load along with the loads
>> of the system, and even in some of those cases depending on the
>> generator dosn't even fix that.
>>
>> I have seen some successful with filter caps on the output / Input of
>> the inverter, but that is pretty hit an miss..
>>
>>
>> <http://www.rollsbattery.com>
>> Steve Higgins ⋅ Technical Services Manager
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>>
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>> On Mon, Aug 17, 2020 at 10:42 AM Will White <will at solarenergy.org
>> <mailto:will at solarenergy.org>> wrote:
>>
>> I've seen that same issue too. I assumed that the battery
>> charging, house base loads, and the microwave were too much power
>> for the small generator. The voltage drops big time which I
>> assume is what was causing the issue with the microwave and most
>> likely with the dryer too.
>>
>> On Sat, Aug 15, 2020 at 11:51 AM Dan Fink <danbob88 at gmail.com
>> <mailto:danbob88 at gmail.com>> wrote:
>>
>> I have the same problem at my place, and a couple client's
>> systems, with Magnum inverter/chargers and small ~2-3kw
>> generators (not just Honda). But the problem appliance is
>> microwave ovens, doesn't matter which microwave brand. They
>> run fine straight from the generator, and fine from the
>> inverter with no generator running, but make a strange, loud
>> hum, dim internal light, and food doesn't heat if the
>> generator is also charging the battery bank. I'll try to
>> figure out how to capture a waveform photo with my scopemeter
>> and post it.
>> Dan Fink
>> Executive Director, Buckville Energy Consulting
>> NABCEP PV Associate
>> NABCEP Certified PV System Inspector
>> IREC Certified Instructor™ for:
>> ~ PV Installation Professional
>> ~ Small Wind Installer
>> NABCEP Registered Continuing Education Providers
>> d
>> <mailto:dan.fink at greendustrialtraining.com>anbob88 at gmail.com
>> <mailto:anbob88 at gmail.com>
>> 970-672-4342
>>
>>
>> On Sat, Aug 15, 2020 at 9:37 AM Kent Osterberg
>> <kent at coveoregon.com <mailto:kent at coveoregon.com>> wrote:
>>
>> Matt,
>>
>> I haven't looked at what the FXR does to the waveform of
>> a 3000-watt Honda, but I have used an oscilloscope to
>> look at the waveform of a small generator while an FX
>> inverter is charging batteries -- it pretty much makes an
>> ugly mess of the voltage waveform. Not surprised to hear
>> that some loads don't like to operate when the FXR is
>> charging batteries from a small generator. The FX charger
>> has a poor power factor and little filtering of the
>> current waveform, it is a tough load on a small
>> generator. The generator responds with lots of harmonic
>> voltages and high frequency noise.
>>
>> Kent Osterberg
>> Blue Mountain Solar
>>
>>
>> On 8/15/2020 8:06 AM, Matt Sherald wrote:
>>> Hello All,
>>> My curiosity was piqued by a recent customer complaint.
>>> I'm hoping someone has bumped up against this issue before.
>>> The customer has a OB FXR2812 and a 3,000W Honda gen.
>>> Her gas clothes dryer runs just fine off the OB inverter.
>>> It runs properly on the Honda gen (when the inverter is
>>> bypassed)
>>> It will not run when the gen is on and battery charging
>>> is taking place.
>>> All the other AC loads (including the washing machine)
>>> run properly during battery charging with the gen.
>>> The OB inverter replaced an old Trace unit. The dryer
>>> worked as it should with the Trace during battery charging.
>>> Any thoughts are greatly appreciated. Thanks in advance!
>>>
>>> --
>>> Matt Sherald
>>> PIMBY Energy, LLC
>>> NABCEP Certified Solar PV Installer®
>>> 304-704-5943
>>> www.getpimby.blogspot.com <http://www.getpimby.blogspot.com>
>>> www.getpimby.com <http://www.getpimby.com>
>>>
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