5 hp motor on solar

So, someone asked me a question about what inverter would be required to start a 5hp motor.
voltage or phase was not stated, so I'm assuming 240V single phase.
If it was not fully loaded, the data here
https://www.engineeringtoolbox.com/elctrical-motor-full-load-current-d_1499.html
seems like it would be about 25A @ 230V
But how many ganged or stacked inverters would it take to start it up ??
voltage or phase was not stated, so I'm assuming 240V single phase.
If it was not fully loaded, the data here
https://www.engineeringtoolbox.com/elctrical-motor-full-load-current-d_1499.html
seems like it would be about 25A @ 230V
But how many ganged or stacked inverters would it take to start it up ??
Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048
inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A
NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole |
Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor
(1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
Comments
Modern HF Inverters, (ie FET driven) have a max headroom rating, get a surge above that headroom the inverter will not function.
Depends on the Motor. Especially if it has a capacitor start.
Transformer types, ie they are very heavy, and i can only speak about 32kg/ 64lbs toroid core transformers, can take huge surges. We know that the 'OzInverter' 6kW to 15kW Inverter can take surge loads up to 50kW for a brief second, give 15kW beyond 15 minutes and run very happy all day at 6kW.
I have been watching Midnite's new HF Inverter progress with some interest to see how they will rate their Inverters for electric motor surge starts.
Everything is possible, just give me Time.
The OzInverter man. Normandy France.
3off Hugh P's 3.7m dia wind turbines, (11 years running). ... 5kW PV on 3 Trackers, (6 years) .... 9kW PV AC coupled using Used/second hand GTI's, on my OzInverter created Grid, and back charging with the AC Coupling and OzInverter to my 48v 1300ah batteries.
I would say it also depends on the load. Just saying it is 5 HP is often meaningless! Especially these days with very marketing intense engineering and less of the plain generic engineering. Pumps and air compressors seem to be all over the map on specs and actual measurement. It is not easy to measure the surge either.
Below is one of the best worldwide. They do not even spec the 1 second surge. I heard it was over 18KW. It starts most anything an offgrid home would require. It can be scaled up to 4 XW if you want more. The only homes that need more offgrid are doing something energy wise that is not standard or normal for a home.
http://members.sti.net/offgridsolar/
E-mail [email protected]
WELL PUMP and Inverter QUESTION
Wind/solar for large scale pumping etc (out of my depth!)
could use knowledge - using Gould jet pump - transfering from 230vAC to ? DC (new link/thread 10/27/2012)
Help required to design off grid system (information on possibilities to connect "standard VFDs direct to solar panels) (new link 1/13/2013)
And from a new poster, link to solar VFD (looks interesting):
VeichiElectric said:
u really should read this article about solar pumps:
https://www.veichi.org/solutions/water-supply/pump-vfd-or-vsd-for-constant-pressure-water-supply-system.html (updated link -BB 1/1/2019)
In your case I wonder if a solar PV inverter would help or not.
-Bill
1/7/2017:
Dave Angelini said:
Grundfos has been doing solar water pumping for 30 years in the Americas and over the seas
http://us.grundfos.com/about-us/news-and-press/news/Pumped-by-the-Sun.html
They have some really nice plant tours down in the Fresno area of California.
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
So without knowing the exact motor specifications, can lead to dissapointment, usually not immediately but down the road, my previous dealings with Grundfos drives was an extremely expensive mistake by them, having to replace over 30 motors > 5hp, due to lack of foresight....or ignorance.
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
A clamp on meter needs to be very good and expensive to capture the surge. Most are on the low side because they can't capture it.
Grundfos is great in North America and takes care of their dealers. If you buy pumps on the internet you should have both eyes wide open, especially if this is for offgrid!
If this is for you Mike, give me a call or text!
http://members.sti.net/offgridsolar/
E-mail [email protected]
i know about the issues with large VSD and snubbers and filters have to be used ( there is also a big kick back to the AC source, and inverters won't like that) so my inclination is for a 3 ph inverter and a motor exchange for the 230V motor
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
The thing to really be super careful with is a large DC motor application. At the bottom of most warranties, it is excluded or a weasel clause is there to limit warranty from large DC kick-back current. Much safer with AC pumps!
http://members.sti.net/offgridsolar/
E-mail [email protected]