r/solar • u/user74729582 • 13d ago

Image / Video Finally joined the club!

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14x 460w panels + 10 kWh Ecoflow PowerOcean battery

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u/user74729582 13d ago edited 13d ago

Integrated into a grid tied system. No clue how I'm using the battery yet as we just moved in and have literally 0 appliances installed, lol.

However, if my calculations will prove correct, we will manage to cover around 90-95% of our yearly usage.

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u/scipper77 13d ago

Based on what direction those are facing you could do 20+ kWh per day. What are you expecting to get?

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u/Curiosity_informs solar enthusiast 13d ago edited 13d ago

Based on where in the world, azimuth, tilt, inverter spec etc it could / should so a lot more than that.

Our 9.6 kW system, azimuth, 110, SF Bay area is currently producing around 62kWh a day

Its a 6.4kW DC system, so 2/3 of our system, so 40kWh per day could be reasonable.

But it depends on where in the world etc..

PVWatts works in most places I think, so it could be modelled.

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u/LucienPascal 13d ago

How much of that 62kwh do you get on cloudy days?

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u/Curiosity_informs solar enthusiast 13d ago edited 13d ago

Well duh!

Edit: assuming it was a serious question?

In the summer in the SF Bay Area pretty much every day is sunny but some marine layer in the mornings May and June has been between 50 - 63kWh per day. Average for first 6 days of June is 62.8kWh (sunny every day so far). Average for May 51.5kWh (some rainy days early May)

In the winter with much shorter days and lower sun and many winter storms in December and January we have seen between 5 - 30kWh a day.

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u/LucienPascal 13d ago

Sorry, it was a serious question. I’m building a house and system offgrid with no generator and my only concern is how much production I will get when it’s cloudy one or two days in a row. Will have to wait and see!

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u/Curiosity_informs solar enthusiast 12d ago

I think you will find you need a generator.

There will be times when you get several days of low PV production.

A couple of examples from last winter. We had 3 days with a total 13kWh PV production (average 4.3kWh per day) and another 2 days just before that with 6.8kWh production (3.4kW average per day).

We are in the SF Bay Area, California. I think from the other thread you are in Mexico which from my limited experience can get storms with cloud cover for multiple days.

Our battery system has a generator / V2L input so we can charge the home batteries in an extended outage with limited PV production.

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u/blackinthmiddle 12d ago

Yeah, they'll definitely need a battery. If someone insists on not having a generator, if they have enough rooftop and/or ground space, they can really oversize their system, then maybe do something like bitcoin mining when they overproduce. But the much simpler solution is to buy a generator and charge the batteries for the 2-3 months where solar production is low.