nope EU have single phase 220V too!.. and those are auto sense 50 or 60hz, by the way they use it to control the synchronization!......... 90 to 95 percent efficient( of these toroidal).....supose 90% and you are generate 2Kw, your lost could be 200Watts!!!!!!... No to bad!, and you will save close to 50% ( because the toriadal on alibaba are cheap too! ).. I'm looking if some one , try!I'm pretty sure the European 240 volt inverters use 3 phase, or at least more phases than we use in the US (I'm not super familiar with 240v European power). A lot of the 240 volt units are 50 hertz as well, and if the it's the 60 Hertz model, it's for the "US", and they generally cost just as much as the 120v US units.
I had actually looked into doing the same thing, buying a cheaper inverter designed for European use, and converting the voltage into something more usable. Between the losses of conversion, issues with phasing, and cost of additional components, I decided against it, and just went with a 120 volt 60 hertz US model.
Funny they won't show you the transformer, that should be pretty dinky and only a KW at best. Now try and buy those connectors.
Of course there is a cost of violating the KISS principle. Adding complexity when there are less complex alternatives has to be evaluated economically. It is a global marketplace and I have not seen hard data that equipment built to North American standards is actually any more expensive than similar European equipment. If the difference is between UL rated and non UL rated equipment, I understand the difference in price.because 220v inverter are more common on the market, versus US format!... and toroidal transformer, aren't expensive !
example....https://www.alibaba.com/product-detail/AC-Inverter-5KW-8KW-Single-Phase_1600246655876.html?spm=a2700.12243822.214.171.12483e5fPMUpd2 it will be the perfect option, or deye..... but solark have esclusivity of them and sell those here in USA at $7K. when do you ask to the supplier, they say... no stock, those are exclusivity of solark!.............................."Adding complexity" of course will be some, but are only 4 more passive connections! by phase! and have another benefit, if you put the transformer close to the meter, you could delivery more power using the same cable, close to 2 time! another more..... you will need 2 inverter..... it multiply the Mppt, and divide the battery (less AH in one connection) and there 2 inverter, 1 fail, but you will get power yet! ... plus the toroid I saw, has only 2 or 3% of lost!Of course there is a cost of violating the KISS principle. Adding complexity when there are less complex alternatives has to be evaluated economically. It is a global marketplace and I have not seen hard data that equipment built to North American standards is actually any more expensive than similar European equipment. If the difference is between UL rated and non UL rated equipment, I understand the difference in price.
of course, but.. we are two different customers, 1 the goals is low the bill ( 0 export) 2. Low the bill and make some money exporting energy!!!....... I thing that is a waste of money, simple example..... they sell to you 1kw at 29c, but they pay to you 1Kw at 9c...................... My goal: put all appliance to electric in my house, bolila/air-conditioner....( heat pump) ...... and if i can supplier mostly al my watts! will be great!..... and better businesses!.. I think so!.... they way to maxim power, 1. no expend so much money, but no sacrifice the quality 2. use solar track( my self) to can get 40% more of energyThose are the differences between UL rated and non UL rated inverters not USA voltage versus European/Asia voltage.
total agree, but is different if the inverter, single phase(220-240) go to a autotranformer to delivery-->120v single phase ( more basic impossible)Difference between 220V and 240V is small enough most appliances will run on either. Even on 208V. Motors draw a bit more current. Heating appliances operated at a bit lower wattage.
You can make up the difference with a buck-boost transformer. That is an auto-transformer rather than isolation transformer, magnetically producing the extra 20V or 32V in secondary winding which is connected in series with primary. It's efficiency loss is only applied to that percentage of the power; the 208V or 220V out of 240V is used without going through magnetic coupling.
Bigger difference between European 220V single-phase and U.S. 120/240V split-phase is in the U.S. we have two hots, L1 & L2. For grid-tied systems we need a 2-pole isolator. You can't just use the SPST relay built into a 220V inverter to disconnect a 120/240V system from the grid.
They may be OK for an off-grid system. Although, for a transformerless inverter I would worry about battery voltage possibly having 120VAC superimposed on it, making it a safety hazard. That would depend on whether it has galvanically isolated HV section (which can be done with small high-frequency transformer.)
If you use a 120/240V auto transformer on output of the inverter, with center-tap grounded, the SPST relay would only isolate one utility leg. Your inverter would try to backfeed the other leg to grid.
If you used a 240V (or 220V) primary, 120/240V center-tapped isolated secondary, that might work. I would still have concerns about one leg of the primary remaining connected to utility grid; I don't think it should be used that way. A 120V single-phase inverter (like one of my US model Sunny Islands) would be OK; one wire goes to neutral, the other through SPST relay to hot.
total agree, but is different if the inverter, single phase(220-240) go to a autotranformer to delivery-->120v single phase ( more basic impossible)
remember, my goal is 0% export!... and the CT take care of the measure to do it!Correct.
But the question is exactly what grid configuration you are going to hook this inverter to, and what you will do on the load side.
My concern is that sneak paths can result in backfeeding the grid when inverter is supposed to be disconnected. I think it can be accomplished, but need to be careful, consider how things are wired when designing.
Initially, Sunny Island was only available in 220V European model, and I considered that.
Later, I bought a single 120V US model. Same 56A SPST relay only carries half the power in this application.
I considered ways to transfer PV between grid and backup.
But eventually, I acquired and installed four Sunny Island, wired 2s2p.
remember, my goal is 0% export!... and the CT take care of the measure to do it!