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40-45 if you all you have is a 2500 W inverter and depending on how efficient those solar modules are. But I wouldn't guarantee that small of a solar system running those 12 PC's.

First, how long are you powering these 12 PC's each day and how much electricity do they use? If it's only 6 hours/day, then you're fine. But if you'll leave them on for 12 hours/day, you'll need a bigger system. If they only use 100 Watts each, then 12 hours is okay. But if they use 200 Watts of electricity each, then you'll need a bigger system. If it's 12 hours/day and 200 Watts/ P then you'll be using 28.8 kWh/day (12 PC's * 12 hours/day * 200 W/PC).

Secondly, where are these PC's/ solar panels going to be located? I need to know how much the Sun will shine on them (sun hours, or solar hours per day). I'm guessing they'll be in Haiti in which case the Sun gives about 6 hours of sunlight/day.

Now, I'm going to divide 28.8 kWh/day by 6 hours/day and say you need a 4.8 kW system, not the 2.5-3 kW system that 2500 W inverter is good for. See a 4.8 kW solar system is going to produce about 80% AC power or 3.8 kW AC. That 2500 W inverter will blow with that much electricity.

So, I'm either going to buy two (2) 2500 W inverters, or one (1) 5000 W inverter. And I wouldn't buy 40-45, 65 W modules either - I'm thinking 200 W modules would better suit. For your one 2500 W inverter, you'd only need 12-14, 200 W modules. For a 4.8 kW system, I'd buy 24-28, 200 W modules.

40-45, 65 W modules if you've chosen a 2500 W inverter and expect it to run your 12 PC's.

Be very carfeul with these calculations though! Wisconsin receives two hours of sunlight a day, so the number triples. Loss for the inverter and the batteries should also be considered, as well as temp issues. Solar panels do not work as well when warm. You also need to consider the issue of cloudy days. Will these need to run under all circumstances? Wind may also be added. To ensure operation of these systems 25 hours a day in Haiti I came up with 120 panels and 250 for Wisconsin.

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Q: You want to install solar power just to power 12personal computers your problem is how many solar modules of 65watts do you buy to be able to power these pcs you choose an inverter of 2500watts?
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