In order to size your solar energy panels, you have to decide if you want a direct grid-tie system without batteries or not. If you do not want to use batteries, the size of your solar power generator will simply be what you can comfortably afford ($$). This will help you offset your energy bills, but you’ll have to draw power from the grid at night. Things will be rather different if you want to install an off-grid system with a battery bank.

Contrary to what most people think, step #1 to sizing your solar power system is to check if there is any energy wastage in your home — lights that remain turned on 24/7, pool pumps that keep running even during the night, heaters that never stop pumping hot air, et cetera. Only after you have eliminated these “leaks” can you determine how much energy (KWh) you use every day. Otherwise you’ll be spending lots of money on a larger-than-necessary solar power generator.

It’s easy to determine how much power you use on a daily basis. A quick glance at your utility bill quickly reveals the number. This is the result of those big power-sucking elements around the house. Some examples are your clothes dryer, water heater, air conditioning, refrigerators and heaters. Having your power consumption in mind, you’ll have to multiply it by a factor of 1.15 to correct for power loss through inefficiencies in the system. (Inefficiencies occur as a result of imperfect transmission through the inverter, cables and batteries.)

Even if you are not going to immediately build a solar energy panel now, it’ll be useful to go around your house to look for these energy vampires to slay. Before we go on to the next part of “Sizing Your Solar Energy Panels” series, please do this exercise. It’ll be beneficial to you in the long run and you’ll thank me for it.

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