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For an off-grid system setup including PV and Genset, but doesn’t have any battery storage.
The loads are mainly an AC pump and some lighting loads.
The pv charge controller will also need a battery V to reference (say a Bluesolar in the Easysolar box too). Or any-ole ac pv inverter (even hybrids) will need a reference point.
You won't need a big bank, and even weak/old batts might do. But consider intermittent clouds and the effect they might have on your 'load programme'. A Multiplus or an Easysolar can buffer you through such tough patches - how well they do it is dependent on the batt capacity.
And oh, your system seems quite simple, so a Quattro (2x ac inputs) shouldn't be needed.
No, Quattro / MultiPlus needs to work with battery.
If you do not have a battery, then you don't need an inverter.
The inverter is needed as an intermediate device between the PV and the AC loads. otherwise, how can the AC loads be fed, and the Genset starts when there is no PV?
I don't understand how this should work without battery. You always need a buffer if you don't use a directly powered dc-pump.
As well a Multi doesn't work without battery.
The inverter still needs a battery (even if it is a small bank). At the most basic level, the inverter logic circuits cannot operate without DC supply. It cannot run on AC only.
Another way to think about it is if the inverter cannot "think", then the transfer switch will be open which makes the inverter completely useless, it will not even pass through.
It will be like a car with no petrol.
Please analize the attached setup. Is it feasable?
The MPPT water heater is DIY and worked fine during this summer connected directly to the PV panels, but a lot of energy is available when the overheat protection disconnects it at 85 degrees.
In this new setup the air conditioner has the priority and the MPPT water heater is the buffer that uses only the remaining available power. It is also the reference for the inverter.
No backup (battery) is needed. It must work only when sun is up in the sky.
The only problem could be when load is disconnected and water heater also is disconnected the PV open circuit voltage (two panels in series) could reach 80V. Could this voltage make any damage to the inverter?
The ripple can be filtered with condensators?
Please don't do this, the AC has a big startup peak, capacitors won't be enough.
Also you'll damage the inverter's capacitors due to the big ripple.
