November 6, 20241 yr Hi i have 7 mecer expert 5kva 145 volt pv inverters and want to connect them in parrallel 6 x3 phase and the extra one in single phase with one of the phases is there some one that can help me with a diagram regards nico
November 7, 20241 yr 7 hours ago, Nico redpepper said: I have 7 Mecer expert 5kva 145 volt PV inverters and want to connect them in parallel... A lot of the earlier models only supported a maximum of 6 inverters in parallel/3-phase. Please post the main (U1) firmware version so I can check that they support 9 paralleled units or only 6. If they are only configured for 6, do not be tempted to try 7, as each inverter requires some memory in all the others. So it only specified for 6, the seventh will not be properly synchronised, which will lead to massive problems (a Big Bang). If only specified for 6, it might be worth keeping the 7th as a spare. Unless you have upgraded the capacitors and MOSFETs, these old models will be approaching the end of useful life (whether used or not, though time left unused would extend their working life somewhat). I presume that you are familiar with the MKS Parallel Guide:
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