How To Size An Off Grid Solar Power Generator Part 1 of 4 (Inverters & Batteries) | Solar & Wind Products; View Hundreds of Solar & Wind Products Here!

How To Size An Off Grid Solar Power Generator Part 1 of 4 (Inverters & Batteries)

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This is the first of a series of 4 videos I made to help people size an off grid emergency solar generator in case of a long term power outage. I go over watt hours and maximum rated wattage loads. I also introduce the Kill A Watt meter.

Add up all of the maximum wattage rating from all of the devices you want to run at the same time and that cause the greatest load. Then, add another 25% to 35%. This should tell you the approximate size inverter you need. If you run something that requires a large amount of wattage when first starting up, you need to consider this in your inverter selection. You also need to know if you are going to run a 12, 24, or 48 volt system when selecting an inverter. Use this information when discussing your needs with the solar supply company.

To get the most life out of your battery bank, many solar supply companies suggest not discharging more than 50%. This may only apply to certain types of batteries. You need to inquire about this. With my AGM batteries, I could discharge more, but they will last longer if I do not. So, I suggest adding up all the watt hours your devices use within a 24 hour period and at least double the watt hours to determine minimum battery bank size.

I am not an electrician so you should fact check me before making any decisions based on anything I suggest. Don’t rely on my suggestions or advice to make important decisions related to your system until fist speaking with an electrician (I did) and solar supply company (I did). This is just a hobby for me…

Here is the form I made for you…
http://preppingover50.com/

Here is a link for the Kill A Watt meter… http://www.homedepot.com/p/Kill-A-Watt-Electricity-Monitor-P4400/202196386

http://www.amazon.com/P3-P4400-Electricity-Usage-Monitor/dp/B00009MDBU/ref=sr_1_1?ie=UTF8&qid=1461766014&sr=8-1&keywords=p3+international+kill+a+watt

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4 Comments on "How To Size An Off Grid Solar Power Generator Part 1 of 4 (Inverters & Batteries)"

  1. EZ Off Grid says:

    Power equations are too confusing for me to deal with. Think in terms of current. You know many Amps/hr your battery has so its simple. (How much current does a device use and how much time do you use it every day).
    DC current readings are labeled on 12Vdc devices. As far as the inverter is concerned 120Vac is RMS (or DC equivalent). Use your Kill-a-Watt meter to measure the 120 Vac current and multiply by 10 to get the 12Vdc current. That is the current you are using off the battery. Inverters are inefficient so use as many 12V devices as you can. Keep the inverter turned off when you are not using it they are power hogs.

  2. Thanks for sharing

  3. Philip Nauer says:

    Could you share a link of the batteries you used?

  4. DrgnFlys says:

    How many amp hours would one need to run a household running the usual 120v system @ 30 kw usage per day for 1 day? I was looking at an 12v 1182 AH battery @ 20 hrs, or 750 AH @ 6hrs, if I used a 25% DOD (to increase battery life) how much of that 30 KW usage would this battery provide using the previously mentioned 25% DOD, or 295 AH @ 120v? I've been trying to figure this out-I still don't have enough math, when done in this direction.Thanks heaps!

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