Jump to content
Sign in to follow this  
PJJ

New installation suggestions and questions, so many questions

Recommended Posts

Hello guys

I have been browsing the forum for some time now, and I must say I think I am in good hands :)

Ok lets start, I live in a small town that is notorious for power outages, and also from time to time water, everyone in my neighborhood has 2000L Jojo tanks and pressure pumps for exactly this reason (as do I), its a medium sized 3 bedroom house with only myself and my wife.

Up until now the power issue hasn't been so bad, its mostly only gone down when maintenance happens (although it feels like maintenance is at least once a week) and I have a UPS that keeps my networking equipment, alarm system and one outside light on in the event of a power failure, sadly in theory it can only last for about 8H on the batteries so in practice its more like 7H, my biggest concern is my alarm, networking and IP Camera system falling over should we have a extended power outage. 

My monthly usage is around 400Kwh which means I use about 13 Units a day, I already have a solar geyser, and I am planning a gas stove as my next purchase as well, that might help to bring me down to 11-12Kwh a day, I definitely want to go grid tied so that I can use the utility power just to plug the small gaps of power I might need, and I am considering building 2 flats on the property later on.

 

For a start: I just want a reliable power backup for when the utility power falls away, but I want to flexibility to just add solar panels later on and expand if needed

I have been browsing the available inverters and I quite like the Goodwe 5Kw EM : https://solaradvice.co.za/product/goodwe-em-5kw-hybrid-inverter-2-3kw-backup/

But what I don't understand, does it have 2.3Kwh worth of backup power/storage built in? If it does it already solves a large part of my problem, and regarding the solar if I have excess energy during the day and I export it to the grid, will my meter start spinning backwards? (I have municipal power) and is the Goodwe a true hybrid inverter in the sense that it can combine PV/battery and Utility to supply the required load unlike the Axpert's that will go into bypass? and also let say if the total load is 10Kw, will the Goodwe provide 5Kw and take the other 5 from the Utility or will the inverter go into bypass because it cannot supply the load and take the whole 10 from the grid?

Lets start with those questions first :)

Thanks a lot guys!

Share this post


Link to post
Share on other sites
4 hours ago, PJJ said:

But what I don't understand, does it have 2.3Kwh worth of backup power/storage built in?

Don't confuse kw with kwh. One is a measure of power, the other is a measure of energy. Power has a time component (if you use the same energy to do the job, but you can do it in half the time, you have double the power), energy has no time component. By multipling the power (kw) with the time (h) you get back to a unit of energy. Technically we should be using joules, but kwh is more convenient :-)

Anyway.... as I said, don't confuse them. The inverter can handle power of 2.3kw continuous or 3.5 surge, but you still need to add a 48V bank of batteries.

4 hours ago, PJJ said:

is the Goodwe a true hybrid inverter in the sense that it can combine PV/battery and Utility to supply the required load unlike the Axpert's that will go into bypass?

It's a true hybrid. I don't know exactly how it works and how finely adjustable it is. That price looks good, I remember them being over 30k. It's about in the ballpark of a 3kva Multiplus with a 35A MPPT, and it's IP65, so by the looks of it it's a good deal.

I don't know how it goes about mixing power between battery and grid, but @Mike is the guy to ask, I believe he has or had a Goodwe on the wall.

Share this post


Link to post
Share on other sites
On 11/8/2017 at 11:42 AM, PJJ said:

But what I don't understand, does it have 2.3Kwh worth of backup power/storage built in?

This Chinese nomenclature hence the confusion backup power is basically essential loads that will be powered by battery in the event of utility going down. The other is on grid and will be supplied  either by PV or grid (or a combination). There is no built in storage

On 11/8/2017 at 11:42 AM, PJJ said:

........ and regarding the solar if I have excess energy during the day and I export it to the grid, will my meter start spinning backwards? (I have municipal power) and is the Goodwe a true hybrid inverter in the sense that it can combine PV/battery and Utility to supply the required load unlike the Axpert's that will go into bypass?

The Goodwe comes with a  limiter. It looks simple and those that I have spoken to it seems to perform as expected (except for @Wetkit but it think his problem is more meter related and he has tried more than one system). I am halfway through my first Goodwe install (the client has gone on a fishing trip) and as soon as I have finished I will be able to tell you more.

It is a true hybrid and by all accounts performs well. It is IP65 fanless and has a very simple interface. For more detailed information you connect to the inverter via an Android device.

I see you looking at the EM series. May I suggest you look at the 5048 ES  which is a 4.6kW inverter and the entire 4.6kW can be used in backup mode. The 2.3kW split of the EM units makes no sense to me. You pay nearly the same for a ES unit and end up with only ½ the backup capability.

Goodwe.PNG.251e1d095aec05d3909c28b8c3347c8f.PNG

In this example bottom left is "backup power"  and this is powered 100% of the time either by PV/battery or grid.

Bottom right  is the gridtie feed. This can be supplied either by PV or grid.  If the grid falls away then those appliances cannot be powered.

 

Chris

 

 

 

Share this post


Link to post
Share on other sites

Thanks for all the replies so far, ok Goodwe 5048 ES it will be (if I go the Goodwe route)

Any other Goodwe owners here that can share some of their views on the inverter?

Share this post


Link to post
Share on other sites
17 hours ago, Chris Hobson said:

This Chinese nomenclature hence the confusion backup power is basically essential loads that will be powered by battery in the event of utility going down. The other is on grid and will be supplied  either by PV or grid (or a combination). There is no built in storage

The Goodwe comes with a  limiter. It looks simple and those that I have spoken to it seems to perform as expected (except for @Wetkit but it think his problem is more meter related and he has tried more than one system). I am halfway through my first Goodwe install (the client has gone on a fishing trip) and as soon as I have finished I will be able to tell you more.

It is a true hybrid and by all accounts performs well. It is IP65 fanless and has a very simple interface. For more detailed information you connect to the inverter via an Android device.

I see you looking at the EM series. May I suggest you look at the 5048 ES  which is a 4.6kW inverter and the entire 4.6kW can be used in backup mode. The 2.3kW split of the EM units makes no sense to me. You pay nearly the same for a ES unit and end up with only ½ the backup capability.

Goodwe.PNG.251e1d095aec05d3909c28b8c3347c8f.PNG

In this example bottom left is "backup power"  and this is powered 100% of the time either by PV/battery or grid.

Bottom right  is the gridtie feed. This can be supplied either by PV or grid.  If the grid falls away then those appliances cannot be powered.

 

Chris

 

 

 

I too don't quite understand the intent behind the new EM models either. The price is so close to the ES models and can't compare at all.

They are also available from the same place https://solaradvice.co.za/product/hybrid-inverter/

The only thing I don't like about these units is the fact you can't run them in parallel.

Share this post


Link to post
Share on other sites
1 hour ago, Identity Seeker said:

The only thing I don't like about these units is the fact you can't run them in parallel.

Given that they are priced pretty close (within 10%) of a 5KVA Multi, if you really need the parallel capability you could look at those instead.

I think the appeal of this unit is that it's 10% cheaper than the nearest Multi and comes with a built-in MPPT.

Share this post


Link to post
Share on other sites

the only comment i can make is....they work, they don't give any shite, and as the others have said full 4.6kw of backup, they switch over on outages seamlessly - you do not know youre on battery at all. i used to run 3 of them with a split DB to one battery bank..only dumped two of them to allow for a 11kw gti for mining and one goodwe to run the home with everything connected bar the rigs and asics that pull around 7200w/24/7

Its one of the most stable Ip65 units out of China with fair good backup direct from the factory if needed from Jack Song..

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×