GordonT

I have two 12v AGM batteries connected in series to give the required output of 24v connected to a 3Kva Expert king inverter tied to the grid with no solar panels. The unit is for backup purposes only. The voltage settings on the inverter are 22 volts min and a 27 volt maximum. As we can go for weeks without a power outage is it necessary to have the inverter charging the batteries even thou the batteries are not being used. My question is should I disconnect the batteries and switch off the inverter for a two or three days a week... Thanks in advance..

Good day all. First of all on the diagram below will this wiring below be considered legal an if not what must be changed for it to be ? Two. If the three way switch is switched to mains while the inverter is in circuit will the power being feed from the mains into the inverter output damage the inverter ?

Thank you for your reply and clearing up that the connection to my two pole three position switch before the inverter must not go through the RCB. My intention is to have only two of my plug sockets circuits and lights working through the inverter. The two pole three position is to allow me to disconnect the inverter should I have a problem. And for the house then to operate as normal as if the inverter never existed. Please see the attached diagram. Many thanks inverter plus 3way switch wiring.odg

Good Day all.. My question is : Should the input to the Axpert 3kva king inverter be wired through the house's Earth leakage unit/switch or should it be wired in the same way as my geyser and stove,which do not go through earth leakage unit/switch. Many thanks

Please see attached diagram. What size wire would you recommend from the db board to the change over switch and from the change over switch to the inverter. Does the Hager SFT240 switch break before it make contact again.. many thanks GordonT

Thank You...... Now i am on board with what you are saying. The extra change over switch is a must.. from an ease of operation and a safety point as well.. Thank you really appreciated Gordon T

Thanks for the replies... Not sure if i worded my question correctly....... Lets say I wish to use only the Lights circuit on my db board as it normally does grid is working. Then when the grid power is off. I would like to have my inverter use that same Lights circuit that is on my Db Board, without the inverter feeding power back to my electricity meter. My Question is how would this connection be made. Many Thanks G

Thank you Achmat for your reply... If I am understanding your reply correctly it seems that my whole house will then be set to run off the inverter...As my inverter is only a 3kva inverter this would be a problem. Really what I aim to try and do is have my lights and about three plugs which are on the same circuit breaker work when the power comes from the inverter.. Without having to run round switching off appliances ...Thanks

Good day all .... Please can someone explain to me how the inverter output power is connected to an existing house circuit so that the inverters power does not feed back to the utility. What I am looking to achieve is to use the house circuits as normal when the grid is working and then use the same circuits when the inverter is supplying the power. Thanks in advance

Is the problem you are having not with the installation of the unit to the grid.... if the output of the inverter is connected to the circuit breakers in the main DB board incorrectly this would feed back power to the grid.. Just a thought

A huge big fat thank you to all that replied to my topic very much appreciated Gordon T

Thank you for your reply.... The Inverter is Axpert 3kva 24 volt King inverter. The man definitely said to have a fuse on each end of the cable which to me makes absolutely no sense whatsoever.. I can accept one correct rated fuse but just cannot see the point of two fuses

Question 1 I have just been told that I need to have two fuses on a one and a half metre long battery to inverter cable. One where the cable connects to the Inverter and the other at the battery connection... ??????? Question 2 I cannot use a 2.5 Four core and earth Surfix cable.... two wires from the DB Board to the Inverter and the other two wires from back from the Inverter to the DB board and a common earth... ????? On both of these two questions i cannot understand the reasoning please some kind person help me.. Thanks GordonT

Thank you that is very interesting about the db board cover plastic clip would never have thought to ask for the clip... thanks again..

Thank you ... Building a new Db board without a major renovation is just not possible. I would like to do that but with a prepaid meter and getting council involved That becomes a hold new can of worms... Thanks Anyway GordonT

Good Morning All. Please can some qualified person have a look at my wiring diagram and tell me what needs to be changed for the installation of the 3kva inverter to meet regulation standards. Thanking every one in advance regards GordonT

Surely it is the size of the geyser element that will determine the size of the wire that is used... eg: 150 litre as to a 200 litre geyser will have a different size elements.

Good Morning all...... Your help required Is it possible to convert Circuit breaker mounting from standard to din Many Thanks GordonT

What is the reason for having more than one neutral connection points in a db box

Many thanks Plonkster and Richard for your input....... I am all for the safety of the installation of an inverter and will make sure it is in compliance with all IEC/SANS ratings and that a certificate of compliance is issued on completion of the installation. I actually have another question. That I sure you guys can help with. My mains Db board has only got the sans type circuit breaker mounting brackets and want to know if i can mix the din type switch mounts on the same board.. Really appreciate your advice and input. GordonT

Thanks Richard........ I had forgotten about the built in switch or relay that comes as standard on a Axpert 3kva King inverter so what i think you saying to me is that the SFT 240 change over switch really only needs to be used if you have problems and do not want to feed power back into the grid. Is my thinking correct or is it up the Creek...

If you really think about it. Should we not be using a relay instead of a change over switch as this could be wired so that the relay wound be fully automatic switching between mains and inverter and would require no human intervention.

Good Day My question is the SFT-240 model switch an automatic switch that switches between the inverter and the mains as the supply situation changes many thanks GordonT