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Posted

Morning

I have a 5kva grid-tie inverter connected to the main grid and also connected to a Selectronic sp pro smart bi-directional inverter/charger. This unit is connected to a 600ah battery bank and feed a separated mains distribution board. I want to expand my system by adding another 3kva grid-tie inverter on the AC side of the bi-directional inverter/charger with 3kva of solar panels and a power diverted to protect my battery system.

Both 5kva and 3kva grid-tie inverters should be able to feedback to the grid when my load is less. When grid falls, the 5kva grid-tie inverter should go down to protect the grid but the 3kva grid-tie should stay up to assist the bi-directional inverter to provide load and to charge batteries.

Will this work ?  - Please advice

 

 

 

 

Posted

I took a change and connected a grid-tie inverter on the AC side with 5 x 300w panels. Everything looks fine and when a drop the grid, the one inverter do go down and the inverter on then AC side says on. Did a load test and was able to pull more than 5kva from the inverter/charger which I could not do before. So it seems the second grid-tie inverter contribute his kw to the 5kw. Did see I will need a power diverter because it do overcharge my battery's when they are full and load are low.

Where can I source a power diverter or better -  something that can put of the inverter when battery's are full and put on the inverter when battery's are on 80% ?

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