July 1, 20215 yr Hi All, I want to add more panels to my system, currently i have 6 x 400W panels on my Axpert King, I would ideally have liked to add another 6, though that theoretically puts me over the maximum input W to the MPPT. Though i have never seen 2400W from my existing panels. Would it be safe to add another 6 panels considering losses and efficiency or should i play it safe with 4? Also the position of the new panels will be closer on the roof to the inverter than the existing panels by probably 5 meters or so, do the cable lengths of all strings need to be the same or are differing lengths fine? i assume it doesnt matter but want to be sure when they put it in. TIA
July 2, 20215 yr Author looking deeper into this the panels are 47.0 V and 10.82 A, the inverters mppt is 60-115V and 80Amp max. the reason i initially went for strings of 2 was that i thought 3 in a string was pushing the Voltage range limit. so 6 strings of (47V*2) 94V at 10.82A a string gives a total amperage of 64.92A. Seems safe?
July 2, 20215 yr 36 minutes ago, Dex_ said: so 6 strings of (47V*2) 94V at 10.82A a string gives a total amperage of 64.92A. Seems safe? The Voltage is the relevant one here, as long as the Voltage of the panels stay within the limits of the inverter, all should be fine, since the inverter will limit the current drawn.
July 2, 20215 yr 4 hours ago, Dex_ said: so 6 strings of (47V*2) 94V at 10.82A a string gives a total amperage of 64.92A. Seems safe? One point to look out for is protection, are they installing breakers or fuses for each new string. I would assume 15A fuse or breaker per string on a 10.82A circuit. This might also mean upgrading your breaker depending on your setup, feeding PV to inverter as this can now go up to 64A.
July 2, 20215 yr Author 7 hours ago, Gerrie said: One point to look out for is protection, are they installing breakers or fuses for each new string. I would assume 15A fuse or breaker per string on a 10.82A circuit. This might also mean upgrading your breaker depending on your setup, feeding PV to inverter as this can now go up to 64A. I have a 6 input combiner box with type 2 protection, i am not sure of the exact fuses per string off hand or the main fuse, i will need to check that, when it was origionally sourced the requirement to add more panels was discussed so i hope it is in place, will check. Edited July 2, 20215 yr by Dex_
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