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can the 8048A handle a conventional well pump?

Posted: Fri Nov 24, 2017 5:20 am
by Megunticook
Putting together a grid-tie system with battery backup centered on the 8048A, wondering if it can handle the initial current spike from a conventional well pump. I havent been able to directly measure the power usage, but it runs off a 15A/240V breaker in our main AC panel.

Has anyone run a conventional well pump off their Radian? Can it handle the initial surge?

Eventually we plan to replace the pump, but a Grundfos 3 sqf-2 runs $2K and we're already very tight with the budget, so thinking we might try and get by for a year or so with the conventional pump. My plan is to put a 15A/240V single-throw breaker in the "backup loads" panel along with 4 other 15A circuits for freezer, frig., and some lights.

Thanks for your help.

Re: can the 8048A handle a conventional well pump?

Posted: Fri Nov 24, 2017 4:57 pm
by Ravenswood
I have been running a 1/2 HP submersible pump with no issues. I used a larger than normal pressure tank to reduce the number of startups. The only adverse affect is that the lights sometimes flicker slightly when it kicks in.
I also run a woodworking shop with stationary tools including a 5 HP table saw and it also starts up just fine.
I would worry more about having to support both a freezer and refrigerator with a (presumably) small battery system.

Re: can the 8048A handle a conventional well pump?

Posted: Tue Jul 02, 2019 1:05 pm
by SwDoctor
Have been 6years without issues.
Larger than normal pressure tank is suggested, to minimize cycles (like other user said) is a wise idea and have done that also in my setup.
My pump is a "off the shelf" 120v power model. But since the Radian output is 240v it would be actually better to use the 240v version. I just went with the cheaper option, and it works fine.
The main thing to consider is this: Know the wattage of your well pump (mine is 1400w), so taking into account 8000-1400 = 6600 then you should consider that if I am using more than 6600 watts, and then reach over and flip on a faucet or flush a toilet, I could overload the inverter.
This is another key reason I chose the lower wattage pump that would be less likely to cause a surge when activated. (it was cheaper too) - but it is a lesser head depth rating than most- but my well is only 100ft and still delivers almost 40gallons per minute to the surface.
(I use automation system and a SSR based distribution panel to make this scenario sort of impossible- by torquing off some other load such as one of the air conditioners if an overload is likely- this is mostly because I use tools in shop, a grinder or air compressor could tip the canoe without it.)

Re: can the 8048A handle a conventional well pump?

Posted: Mon Jul 22, 2019 6:56 pm
by eesiason
It can, but when the pump starts to fail, it might not like it when the voltage spike goes wild on startup. And your generator will definitely not like it. Guaranteed.

Put in a Soft Start pump, like this one: https://www.amazon.com/gp/product/B002NJIK0I/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

A Soft Start pump has no surge on start and gradually ramps up to operating voltage. It's worth the extra bucks, and a thing of beauty to watch on the Mate as it starts. No huge tank required, and you can run it on a wimpy generator.

Re: can the 8048A handle a conventional well pump?

Posted: Wed Aug 14, 2019 7:41 pm
by sparksalot
I use Soft Start add on controller on all my big high wattage high surge motor applications including well pumps, heat pumps and A/C units.

Try a Hyper Engineering Sure Start sized for the motor load. Works on your existing motors.

Not only good for the inverters and generators, but it is great for the life of the motors too!

Re: can the 8048A handle a conventional well pump?

Posted: Thu Aug 22, 2019 12:21 am
by Megunticook
It's been a 22 months since I first posed the question at the top of this thread, and I've since installed an 8048A that's been running for over a year and a half. No issues at all with the well pump. But have my eye on a low-amperage pump to replace it with...just need to cough up the $2K!

I'll check out the soft start though--hadn't heard of those before.

Re: can the 8048A handle a conventional well pump?

Posted: Thu Aug 22, 2019 6:58 am
by sparksalot
Generally low amp well pump motor equals low height of lift and low GPM yield...might work for some...doing it slow and steady.

Re: can the 8048A handle a conventional well pump?

Posted: Sat Aug 31, 2019 6:06 pm
by kayak1
Megunticook wrote:
Thu Aug 22, 2019 12:21 am
It's been a 22 months since I first posed the question at the top of this thread, and I've since installed an 8048A that's been running for over a year and a half. No issues at all with the well pump. But have my eye on a low-amperage pump to replace it with...just need to cough up the $2K!

I'll check out the soft start though--hadn't heard of those before.
Megunticook,

Thanks for the post, I was able to bring my 8048a live today with one of the arrays and made 23.7kWh. :-)

Now I too need to figure out the correct charging parameters.

I am on Westport Island (Midcoast Maine) and very much enjoyed reading some of your blog tonight. My wife gave me the green light on the solar purchase last year during one of our monthly power outages.

-Jason

Re: can the 8048A handle a conventional well pump?

Posted: Fri Nov 22, 2019 7:37 am
by linel
If you think about it in a solar powered home you should be using LED lighting and gas (LP/NG) cooking. Other then maybe a coffee maker or some other lite electrical appliance almost all of the larger loads will be motor loads whether tor a well pump, refrigerator, freezer, tools, etc. How could the GS8048 not be designed to handle motor loads within the surge ratings of the inverter?

Re: can the 8048A handle a conventional well pump?

Posted: Fri Nov 22, 2019 8:48 am
by pss
Linel:

California is proposing to stop new housing from have natural gas connections. They want all electric from renewable resources. Natural gas and LP burn and release a large amount of CO2. So the off grid solar home is to be all electric and fuel cell powered too.

Re: can the 8048A handle a conventional well pump?

Posted: Fri Nov 22, 2019 8:05 pm
by kayak1
pss wrote:
Fri Nov 22, 2019 8:48 am
Linel:

California is proposing to stop new housing from have natural gas connections. They want all electric from renewable resources. Natural gas and LP burn and release a large amount of CO2. So the off grid solar home is to be all electric and fuel cell powered too.
Not just CA doing that:
https://www.bostonherald.com/2019/11/21 ... -the-past/

Re: can the 8048A handle a conventional well pump?

Posted: Sat Nov 23, 2019 11:26 am
by JRHill
When I planned the solar I did not want the well pump on the same system as the house. The idea is water is profoundly important both to us and the livestock and I didn't want to risk losing water. I went with the Grundfos pump ( 11SQF-2) and, of course, 48vdc. I could be happier - except for the pump price - which gets cheaper by the service year as it is amortized. I did have problems with hot water and thought it was the minimum water pressure required by the Rinnai. In the end it was the condensate drain which hydro locked and threw erratic errors. And mice. In the end, when those problems were identified and fixed, I added a 2nd 80g pressure tank and narrowed the pump on/off limits.

A few lessons learned with the Grundfos stuff: You do not need the CU200 controller for $500. Its cute but the pump works just fine on a standard pressure switch. But I would recommend the IO101 alternate power interface. It allows you to run the pump from a generator or other 110/240 source if something in the solar is down simply by plugging in an AC cord. It cuts the DC source and connects the alternate power simply by plugging it in.

Best, Jim