But you want to only take a lead battery to 1/2 that to avoid decreasing
the longevity of them, so double the battery size and, if the batteries
are going to be outside in the winter you will lose performace so double
it again.
Lithium, I have learned that yes you can discharge them fully but you
only want to charge them to 80% to get maximum life. So you only need
to go 120% of your battery calculation for lithium...
On 11/7/20 1:40 PM, [email protected] wrote:
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
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