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Difference between Infinsolar Models


Shane Veness
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Shane, I own a Plus 5K but do not know the VII model.  A quick bit of Googling suggests that some of the differences are:

  • Plus 5K has 2x 5kW MPPT controllers (10kW total), VII has a single 5kW.  Having double the PV means you have a better chance of remaining off-grid when it's overcast.
  • Plus 5K has 900V MPPT controllers, the VII has a 450V MPPT.  Higher voltages mean that you can build longer PV strings and potentially use thinner cabling (higher voltage means less current to generate the same 5kW PV input).  It also means you need to take more care with safety measures.
  • Battery charging current: Plus 5K maxes out at 100A, VII at 80A.  Not much difference in it...
  • The Plus 5K weighs more than twice what the VII weighs.  Make of that what you want! 🙂

Both are capable of parallel operation and both are 5kW.  There may be more differences, but these were immediately obvious...

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There are some more advantages for the 5K plus to add to Christo's list:

  • Power AC out is 5kW but it can mix 2 more kW from the grid. That makes 7kW max.
  • When solar reaches 5 kW to provide loads and the PV delivers more that can be sent to the batteries.
  • With the enrgymeter connected in your DB it can also provide power to the loads on the grid side (AC in) without pushing back into the grid.

Sure there is more to tell but now I'm not that fit so I'm going to sleep.

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On 2020/09/15 at 9:08 PM, ChristoSnake said:

Shane, I own a Plus 5K but do not know the VII model.  A quick bit of Googling suggests that some of the differences are:

  • Plus 5K has 2x 5kW MPPT controllers (10kW total), VII has a single 5kW.  Having double the PV means you have a better chance of remaining off-grid when it's overcast.
  • Plus 5K has 900V MPPT controllers, the VII has a 450V MPPT.  Higher voltages mean that you can build longer PV strings and potentially use thinner cabling (higher voltage means less current to generate the same 5kW PV input).  It also means you need to take more care with safety measures.
  • Battery charging current: Plus 5K maxes out at 100A, VII at 80A.  Not much difference in it...
  • The Plus 5K weighs more than twice what the VII weighs.  Make of that what you wantMake of that what you want! 🙂! 🙂

Both are capable of parallel operation and both are 5kW.  There may be more differences, but these were immediately obvious...

The reason for the extra weight is the transformer in the infinisolar plus the Puls has a large copper tranformer which makes it a low frequency inverter these type of inverters can handle large surges typically 3 times their rating and for a couple of seconds the light weight model is a high frequency inverter  an typicaly can only handle double its rating for a couple of milliseconds which means the plus can take a lot more abuse. Victron inverters as an example are all low frequency inverters thats one of the reasons they are so robust and reliable.

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