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Hi,
im an apprentice for a electronics company and have been tasked with designing a solar site to bring down the cost of our bills at a radio site. this has all been done with my own research and very little background knowledge.
here is my design with some missing information but was wondering if anyone has any advice on how it looks and how i can make it better.
the site consumes 24kWh per day.
Four Lanes Solar Plan 20220613.pdf
thank you in advance.
Probably best you discuss with a victron dealer who will be familiar with local conditions.
Meanwhile here are a few system design considerations you might think about:
Do you need to cope with grid failure and if so for how long? OTOH I see the Four Lanes radio site already has lots of kit so maybe the grid supply is robust enough (or is duplicated or has a stand-by generator)
With an average consumption of 1kW why do you show a 5kVA Multi, are there massive peak loads? If the grid is reliable then cheaper to leave it to handle the peaks and size the inverter for the steady state.
Charging through an MPPT avoids double conversion DC - AC - DC so will have slightly higher efficiency than using the Fronius you show, you can't do both at the same time.
2kW of panels (sic) won't give you 24kWh/day even in Cornwall on midsummer's day, so you will still use some grid power even on the best days. But it will probably not be economic to have enough capacity to run purely from solar PV year round so a balance has to be found.
Likewise sizing batteries is always tricky, ideally you would model the running cost savings with various capacities at various times of year to see what will give you the greatest reduction in running cost per pound of capital expenditure.
HTH and good luck!
I see you are on-grid scenario. Why dont you save yourself some time and money and go with an hybrid inverter? You can keep with Victron + Pylontech maybe? Not sure whats your budget. I also think 2kwp in pv modules its too little for the system you designed. As pv modules, have a look at Longi Solar Hi-Mo6 Scientists. Very good efficiency and price point. I will suggest running some simulations. if you dont have access to PVSol or other paid pv designers, you can try app.opensolar.com and do free simulations with it.
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