Posted February 4, 20223 yr Hi I live in a hot area of the country that get's a lot of sunshine. When the sun shines, we like to use aircons to cool down the house. I don't want to jump full solar yet, but from my research the batteries are rather pricey! Can you use a the Sunsynk 5Kva inverter without a battery, so that when the sun shines, the solar panels can supply the aircon directly? Since when the sun doesn't shine, we're not running the aircons! Later on, I can look at putting in battery storage for night time and load shedding but it's not a priority now.
February 4, 20223 yr yes, you would set it up as a grid tied inverter, it is a very simple set up, you don't have to worry about splitting the db to essential and non-essential. only thing to remember is that you have any assist when there is no sun.
February 4, 20223 yr Author Thanks. That's awesome to know! 1. How easy is it to connect to the DB board? Do you know what that would roughly cost? 2. Does a DB board require a certificate of compliance after you've installed it? If so, what should this cost?
February 4, 20223 yr a grid tied inverter as in your case would need a surge protector and a 32 amp double pole circuit breaker ( total cost about R400 ) and it will be three wires live, neutral and ground, a very simple connection to your db yes, legally any time you make a change, you should have a coc, you would have to check with a local electrician on costs
February 4, 20223 yr 45 minutes ago, Tariq said: 32 amp double pole circuit breaker How is this calculated ?
February 4, 20223 yr the 5 kw Sunsynk has a pass thru current of 35 amps, but there are video's by Keith talking about relays getting welded shut with high currents passing thru and some recommendations circulating on the internet about not going to the max. on a grid tied inverter, you are only feeding into the grid, so it is more or less used as a isolater
February 4, 20223 yr 6 hours ago, Tariq said: the 5 kw Sunsynk has a pass thru current of 35 amps, but there are video's by Keith talking about relays getting welded shut with high currents passing thru and some recommendations circulating on the internet about not going to the max. on a grid tied inverter, you are only feeding into the grid, so it is more or less used as a isolater Hey Tariq. So if he is only using the Sunsynk 5kw as a grid tied inverter then there is no amp limit on the grid side of the inverter. He will be limited to a max of 63A from the grid due to the main breaker. The inverter will only allow 5000w DC (panels) to AC which is 21A roughly. The rest will be taken directly from the grid which doesn't go "through" the inverter. The passthrough function is only on the LOAD (essential) side of the inverter.
February 4, 20223 yr @Leshen, we are saying the same thing, in grid tied mode the mcb would act like an isolator Incase the inverter had to be worked on or removed, also another reason for installing the mcb is when he decides to go normal hybrid mode utilizing LOAD circuitry
February 5, 20223 yr 3 hours ago, Tariq said: @Leshen, we are saying the same thing, in grid tied mode the mcb would act like an isolator Incase the inverter had to be worked on or removed, also another reason for installing the mcb is when he decides to go normal hybrid mode utilizing LOAD circuitry Hi Tariq. Will you still use a 32A breaker on the non essential side when in normal hybrid mode with a battery and panels?
February 5, 20223 yr Don’t profess to know everything, based on the fact there there is a video by Keith on YouTube regarding failure of internal relays on the inverters and saw a post from an installer on another forum, who attended the Sunsynk school in Jo’brg, that they were recommending not to go up to 35 amp pass through. would like to learn if I an wrong in my thinking
February 5, 20223 yr You have to keep in mind, if there is no battery and Eskom switches off the power, for whatever reason (load shedding, etc.) the inverter will switch off, even if there is plenty of power from the sun:
February 5, 20223 yr 2 hours ago, Tariq said: Don’t profess to know everything, based on the fact there there is a video by Keith on YouTube regarding failure of internal relays on the inverters and saw a post from an installer on another forum, who attended the Sunsynk school in Jo’brg, that they were recommending not to go up to 35 amp pass through. would like to learn if I an wrong in my thinking Hi Tariq. With respect, you wrong in this scenario when the inverter is used in a grid tied application with no battery
February 5, 20223 yr telling somebody that they are wrong.without positive feedback, is not a very polite thing to do, i have always asked for your opinion as I believe you know more than I do Edited February 5, 20223 yr by Tariq
February 5, 20223 yr 3 minutes ago, Tariq said: telling somebody that they are wrong.without positive feedback, is not a very polite thing to do, i have always asked for your opinion in a polite way I did say with respect. Also giving someone wrong information on a public forum is completely not on. You keep referring to passthrough current and I am telling you that it doesn't apply when the inverter is used purely as a grid tied inverter. That's incorrect information that you are sharing which doesn't help anyone who needs clear answers.
February 5, 20223 yr 23 hours ago, Tariq said: the 5 kw Sunsynk has a pass thru current of 35 amps, but there are video's by Keith talking about relays getting welded shut with high currents passing thru and some recommendations circulating on the internet about not going to the max. on a grid tied inverter, you are only feeding into the grid, so it is more or less used as a isolater please see the above , my second sentence from yesterday
February 5, 20223 yr 28 minutes ago, Tariq said: please see the above , my second sentence from yesterday Yes. And I asked why a 32A MCB and you didn't give an answer. Why not a 63A?
February 5, 20223 yr Please read the original poster's post, he mentioned that he wanted to add batteries later, so this way he is ready for that upgrade.
February 5, 20223 yr 2 minutes ago, Tariq said: Please read the original poster's post, he mentioned that he wanted to add batteries later, so this way he is ready for that upgrade. You still not answering the question. I'm asking you why a 32A breaker on the grid side and not 63A?
February 5, 20223 yr As per Sunsynk “ max continuous AC pass through = 35 amps “ for the 5 kW Edited February 5, 20223 yr by Tariq
February 5, 20223 yr 2 minutes ago, Tariq said: As per Sunsynk “ max continuous AC pass through = 35 amps “ for the 5 kW Yes but that is on the load side of the inverter , the 32/35 amp breaker should be on the load side of the inverter to prevent it from pulling more than 32/35(you could easy produce more than 35 amp by a combination of solar grid and battery). Putting a 32 amp breaker on the grid side will do essentially nothing but protect the cable running to the inverter and serve as a isolator to the inverter as you mentioned. So the grid side breaker should be sized according to the wire thickness that you are using it has nothing to do with pass through on the grid side of inverter.
February 5, 20223 yr Ok, just asking, educate me, I don’t profess to be an expert, do you have a circuit breaker on the grid side and if so, what size
February 5, 20223 yr 5 minutes ago, Tariq said: Ok, just asking, educate me, I don’t profess to be an expert, do you have a circuit breaker on the grid side and if so, what size Personally i dont have one i use an AC isolator .
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