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Givenergy inverter not generating
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<blockquote data-quote="binky" data-source="post: 542266" data-attributes="member: 490"><p>the wiring of the panels/ choice of inverter, it's clearly not quite getting the MPPT going. They could have fitted a Solis with a start up voltage of 90V and had no problems. Rewiring to a single input is easy enough to achieve, so I would let your installer do that and see what happens. </p><p></p><p>Voc - Voltage open circuit, this is the maximum voltage on the panels with no energy flowing. As soon as the inverter makes a circuit, that voltage drops as the MPPT ( maximum power point tracker) tries to create as much energy as possible by dropping voltage to something like the Vmp figure and raising ampage. At 32V and 4 panels thats 120V, so below your inverters spec of 140V, although generally they will run at lower than that voltage once running. Your system is right on the edge of what will work, so given a nice sunny day, it will probably be OK, but given cloudy darkish weather it may fail to start or keep dropping out. That in turn means you will lose low level outputs mornings and evenings, mid winter and during poor weather. Now, if they rewire the panels as a single string, then your Vmp is 8 x 32V = 256V, which will get the MPPT working nicely and maximise the benefits from your system. Most MPPTs will take 500V or more, so no issues with that</p></blockquote><p></p>
[QUOTE="binky, post: 542266, member: 490"] the wiring of the panels/ choice of inverter, it's clearly not quite getting the MPPT going. They could have fitted a Solis with a start up voltage of 90V and had no problems. Rewiring to a single input is easy enough to achieve, so I would let your installer do that and see what happens. Voc - Voltage open circuit, this is the maximum voltage on the panels with no energy flowing. As soon as the inverter makes a circuit, that voltage drops as the MPPT ( maximum power point tracker) tries to create as much energy as possible by dropping voltage to something like the Vmp figure and raising ampage. At 32V and 4 panels thats 120V, so below your inverters spec of 140V, although generally they will run at lower than that voltage once running. Your system is right on the edge of what will work, so given a nice sunny day, it will probably be OK, but given cloudy darkish weather it may fail to start or keep dropping out. That in turn means you will lose low level outputs mornings and evenings, mid winter and during poor weather. Now, if they rewire the panels as a single string, then your Vmp is 8 x 32V = 256V, which will get the MPPT working nicely and maximise the benefits from your system. Most MPPTs will take 500V or more, so no issues with that [/QUOTE]
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Givenergy inverter not generating
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