Renewable Energy Questions/Discussion > Automation, Controls, Inverters, MPPT, etc
Just bought a powerjack 15000, modding.
welshman:
this is the simplest circuit i could come up with to detect when the mains power, in this case a generator, is switched off or fails so the inverter can be powered down immediately for the delay of C1 to prevent mutiple phases in the toroids going down to the fets and killing them.
i also put in a relay for fault detection as some people has considered that, but it would depend on what the inverter does as even a flash of the fault light would reset it. a simple cap and resistor in line would allow it to wait for more than a flash.
welshman:
--- Quote from: frackers on November 15, 2016, 04:59:49 am ---Note that the bonding of Neutral to Earth must be on the inverter transformer side of the RCB. That way any leakage bypasses the RCB which causes the unbalance and hence trips it out.
Not sure where this idea of mains on battery terminals comes from. There is no mains connection to the battery, there is a great lump of transformer in the way that isolates the mains from the DC side. That's the whole point of having a transformer!! Shorting live mains to earth in fact will connect it to neutral due to the bonding which just shorts out the output of the transformer - no effect (apart from the current draw) on the DC side.
--- End quote ---
because the case of the inverter is earth and bonded to the neutral, if the positive touches the earth it will send down ac via the dc negative which is also earth by casing.
edit - thanks for the input on where to place the earth neutral bond. after checking the gen wiring out better, ill know if there is also a bond of it's earth to neutral. im assuming it does since it uses rcd's. what would having bond the both side of the link do? - while in bypass mode it will have a earth to neg bond in the generator then an rcd then to the inverter input via the control board then via the output of the inverter then tied negative to earth again into an rcbo then feeding the consumer unit.
welshman:
in the case of the pj control board the earth neutral tie point would be here? between yellow and black?
edit - OR should i disconnect the earth (yellow) from the control board and connect it onto the negative terminal (black) then connect the other end of the earth wire to the ground via rod? why would that earth point on the control board be there and is there resistance free continuinty between dc negative and earth (yellow) terminal ? ill test.
welshman:
checked the generator (single phase) wiring, it has earth and neutral bonded at the alternator. next going to check the earth on control board and dc negative to see if there is continuity, if so i plan to disconnect the earth from the inverter mainboard and tie the earth to the black inverter ac output and make that neutral.
Pete:
Hi Welshman, the easiest way to tie the Earth to the Neutral is at your switchboard on the house. There is usually a neutral bar and an earth bar, a short wire is run between the two. RCD's or RCBO's are usually mounted on the switchboard for ease of use.
If you want to do it at the inverter, just leave all the inverter internal connections as they are, and connect the neutral to the earth at the output terminal block. Just a short loop of wire will do.
I always connect the case of the inverter to earth as well. A wire directly from the case to the earth terminal on the switchboard or to the earth rod.
cheerio
Pete
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