Jay-Dee Posted August 1, 2020 Posted August 1, 2020 Hello all and sorry in advance if this has already been asked but I can find it with searching (perhaps searching for the wrong thing) I am doing a complete revamp on my system which was installed prior to current regulations with regards to cut off switches, change overs etc... I am looking at not only being compliant but wanting to do it right! My new setup will be as follows 1x Axpert King 5K inverter 3 banks of panels (2 in series, 2 parallel per set), totalling 12 panels 1x Narada 40V 100AH Li-ion battery Setup will be fed from the grid only when PV and battery are depleted / below 20% DOD. "Safety" in my system currently is as follows (all mounted in the garage with the inverter and battery) My inbound current goes through a dual pole circuit breaker and out via a digital AMP & Volt meter to the inverter (shows me the draw and confirms if there is live current) My return current goes through a dual pole circuit breaker and out via a digital AMP & Volt meter to the inverter (shows me the draw and confirms if there is live current) Solar Bank (currently only 1) goes through a DC circuit breaker to the inverter Things that I am going to add to the above this week while upgrading Battery disconnect / DC circuit break between the inverter and battery (even though the battery has it's own breaker). This will also have a digital volt meter to confirm if there is live current DC circuit break per solar bank and then another combining all three banks prior to the inverter. This will also have a digital volt meter to confirm if there is live current My questions are... In addition to the above, do I need any of the following and can you confirm if it is for regulation or doing it right (interest sake and for others to know) Manual change over switch. The inverter has this built in and I have no intention of running the without the inverter even if it fails, I would rather fix the problem than bypass Fuses on solar and / or battery Anything else / changed on the above Thanks in advance Quote
Jaco P Bloem Posted August 7, 2020 Posted August 7, 2020 Hi Jay You seem to be OK, I also do not have a mechanical bypass, with all the in and out going breakers one can safely disconnect the inverter - but we will have to do some wiring in case of a permanent issue.. You should consider adding surge protection on the PV (on or close to the Inverter). There is discussions in this forum on PV DC fuses - but each string should ideally have a fuse just above the max current source. So if 1 string has 2 in serie that source is app. 2 x 9amp so a 20Amp fuse is OK. (My Axpert can handle 450 V DC, so I have 8 panels in serie - the source stays 9 amp, so a 12 amp fuse in that string is ok.) On my second Inverter I have 12 panels: 6 in serie, 2 parallel strings - the source becomes 18amp so a larger fuse (20amp) is needed if combined. Why not consider more Series connections? it lowers the current. The battery should have a DC fuse even with breakers, you can check the battery specs but 125amp should do it.. Keep well! Jaco Quote
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