30 watts * 24 *14 = approx 10 kWh. So you need a 10 kWh battery. 10 kWh/48 =
210 Ah 48 volt battery.
Now, I have lotsa experience at my latitude and weather. I will take a stab at
your situation. If you can easily get a generator to the site it makes a huge
difference.
I would say you need a minimum of 300 watts of panel which is not much. You
can get one single panel of that size. Depending on the type of charge
controller you use, you will probably want 2 or 3 panels to get the voltage up
in the 60-100 volt range.
So take a look at the MMPV of the panels you choose and add them up in series.
Take a look at the max input voltage of your charge controller. Try to get the
series voltage of the panels close to that max input voltage if you can.
I promise it will work if you do 600 watts of panel, that would be at my
latitude, middle of winter with snow and storms. 20X the load is my rule of
thumb here for off grid. 20X the load and 2 weeks of battery autonomy saves
you from expensive helicopter rides in the middle of winter. So that is why I
am recommending 10X for you. I think Bill once said he can get by with 10X
down where he lives.
From: Gino A. Villarini
Sent: Saturday, November 7, 2020 12:13 PM
To: AnimalFarm Microwave Users Group
Subject: [AFMUG] Solar calculator?
Anyone with a good online calculator?
Or can you assits with:
What size of panel and batteries would I need for a 48v 30W setup to run 24/7
for at least 14 days without power?
Gino Villarini
Founder/President
@gvillarini
t: 787.273.4143 Ext. 204
www.aeronetpr.com | Metro Office Park #18 Suite 304 Guaynabo, PR 00968
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