Hi. I have just read an interesting article by Jason Svarc dated July 10, 2017, which reviewed Victron Energy’s products - thank you very much for the information. I am currently in the process of fitting out a boat to be entirely off-grid. The set-up will be 9kW of PV via flexible panels and 25kWh of Lithium Iron Phosphate batteries. We will use three Victron Energy MPPT 250/85 charge controllers. I am currently considering the choice of inverter and at this point am likely to go with the Victron Energy Quattro 10kVA. I think that 10kVA(8kW) should be sufficient but is possible I might want a little more in the future (no more than an additional 4kW).
As Jason’s review is now over 18 months old I just wish to check whether there is any update on your general views regarding Victron Energy’s products. I would also value your opinion on the size & configuration of the inverter. I have the option to go with a single 10kVA inverter or I could instead choose to pair two 5kVA units. The latter set-up (as I understand it) would mean that I would then have the ability to add another 5kVA unit in the future should I decide that more capacity were needed. I am very much a lay-person, zero technical knowledge in this area, so would appreciate your thoughts on the pros and cons of combining multiple smaller units versus simply having one larger unit. A few things come to mind:
Simplicity: presumably one unit has to be simpler than two
Cost - higher to combine two smaller units of equivalent size to one larger unit
Space - takes up more space to combine smaller units
Performance (efficiency) - I understand that there is a very small diminution in electrical efficiency when combining inverters, but only very minor
Redundancy - perhaps better to have two 5kVA units versus one 10kVA unit just in sense that if one unit malfunctioned would still have the second unit and therefore still have some AC power?
Modularity/Scalability - my understanding is that I cannot subsequently add a 5kVA unit to a 10kVA unit as all of the units always need to be the same. Therefore would need to be three 5kVA units. Is this actually correct please? Could I not simply plug another inverter into one of the AC inputs of the Quattro 10kVA inverter?
No doubt other issues that I have not thought of…
As I believe Jason has lived in a solar off-grid home for many years I hope that he may have insights to offer. Of course, insights from everyone are very welcome! Your advice would be very much appreciated. Many thanks for your help.