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 Topic: recommend a leisure battery
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31/3/2016 at 10:12pm
Location: West country
Outfit: Mondeo
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As suggested forget high power kit like hair dryer and straighteners and the electric kettle.
You need to estimate how much power you will get each day from the solar and deduct what you will use during the time it is generating. The surplus will go into the battery. That will give you an idea how big a battery you will need.
Then make sure there is enough gone into the battery to power everything you will use when it is not generating.
Trouble is each day and month will generate a different amount. In summer you have high power output and long daylight hours with short hours of darkness, so very little battery needed. In winter it is the complete opposite with low power, short days, long nights needing a bigger battery but less opportunity to recharge it by day.
If you use a lot during the day you can make use of a bigger panel. If you don't use much by day you need to balance the power output of the solar with the size of battery.
This is the predicted monthly output of a 245kW system we have just had installed. That is 245,000 watts.
The %year is the percentage of the total annual output generated in that month and will be the same for a smaller system.
The kWh is the kilowatt hours produced. (1000 watts for 1 hour). Pro rata it for a smaller system.
A 110 Ah battery holds 110 amps x 12 volts = 1320 Wh or 1.23 kWh nominal. Allowing for efficiency this will be nearer 0.7kWh. You can see why a battery is peanuts in terms of energy storage compared with what we use.
Month %year kWh
Jan 2.79% 6,446
Feb 4.43% 10,235
Mar 8.28% 19,130
Apr 10.93% 25,252
May 13.15% 30,381
Jun 13.25% 30,612
Jul 12.96% 29,942
Aug 12.09% 27,932
Sep 9.72% 22,457
Oct 6.52% 15,063
Nov 3.81% 8,802
Dec 2.07% 4,782
Total 100.00% 231,034
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