Category: Solar Panel Battery

Sizing Your Solar Energy Panels – Part 3


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This is the third and final part of the “Sizing Your Solar Energy Panels” series. Have you done some calculations for your future solar power system yet? If you have been doing those mini exercises, you’ll most likely find a suitable solar panel for your home by now.

The next step requires us to find an appropriate-sized battery bank, inverter and charge controller. Let’s look at each of these:

1. The Inverter

The inverter you choose has to be sized according to the demands of the alternating current (AC) side of the circuit. Therefore you will choose a specification according to the loads in your house (with a little buffer in case you increase your loads over time). Pretty straightforward.

2. The Charge Controller

You’ll at least need a basic charge controller to begin with. Until you get fussy about how advanced you want this component to be, more affordable models will do just fine. You’ll need to get a specification that fits the output current (Amps) of your solar panel arrays. If you intend to scale up your solar power generator, you’ll do better with a larger charge controller with room to accommodate more solar panels than with two smaller-sized ones.

3. The Battery Bank

The size of your battery bank depends on how you want to use your solar panels. You can size your battery banks such that it can get you through thick clouds that pass by, or you can size them so you can get through three solid days of solar eclipse and a power outage at the same time. It really depends on you. But take note that over-sizing isn’t always realistic. You have to take into consideration the space they occupy and the how much they’ll cost you.

If your home is grid-tied, provided there aren’t frequent power outages, the size of your battery bank isn’t critical. Just size it to take care of cloudy days will do. You can still maintain your lifestyle by drawing power from the grid.

When you design your battery bank, you’ll have less power loss (through wires) if the voltage is higher. If you are able to design a 48-volt system, you can conserve more power than when you use a 24-volt or 12-volt system.

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Friday January 22nd, 2010 in Build Your Own Solar Panel, Building Solar Panels, Buy Solar Panels, Charge Controller, DIY Solar Panels, DIY Solar Power, Home Solar Power Systems, How To Build Solar Panel, Residential Solar Panels, Solar Energy Panels, Solar Panel Battery, Solar Panels Electricity, Solar Power Generator | No Comments »

Sizing Your Solar Energy Panels – Part 2


Solar panel made by BP Solar
Image via Wikipedia

After you know where most of your household energy goes to, you are now ready to plan for your system size. For grid-tied system (without batteries and charge controllers), you only need to make sure the inverter you use is large enough to handle the power generated by the solar panels.

If you are thinking of scaling up your system in the future, you can get a bigger inverter so there’s room to handle more power. You can also get an inverter that fits the power output of your current solar panel, and then add another inverter when you bring in more solar panels. Between these two options, it’ll be more cost effective to have a larger specification if you know your plans beforehand.

For solar power generators with batteries, you’ll need a little more planning…

For a start, we’ll look at how to determine the size of your solar array. Here are the steps to do it:

1. Compute the average Watt-Hours (usage) per day

2. Find out the Average Daily Solar Radiation figure for your location

3. Calculate the number of watts you have to generate per hour of solar exposure (divide #1 by #2)

4. With the solar module you have in mind, multiply its power rating by a factor of 0.7. If you are using a Maximum Power Point Tracking (MPPT) charge controller, you’ll multiply it by a factor of 0.8 instead.

5. Finally, you get the number of modules needed when you divide #3 (energy you need) by #4 (energy generated by your solar panels)

After you arrive at the number of solar modules you need, you’ll also know how much space is needed on your roof. If there isn’t enough space, choose a more efficient photovoltaic module and do the calculations again. Going over this a few times, you will be able to find the solar module that’s most suitable for you and at the right price.

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Thursday January 21st, 2010 in Build Your Own Solar Panel, Building Solar Panels, DIY Solar Panels, Home Solar Power Systems, Homemade Solar Panels, How To Build Solar Panel, Solar Energy Panels, Solar Panel Battery, Solar Panel Installation, Solar Power Generator | No Comments »