If you're really interested, you need to do your own reseach. There is a lot to know.
In regard to batteries, there is no better buy on the planet that old-fashioned flooded lead-acid batteries. As far as lasting a long time? Longevity comes with price. You can buy a 7 year battery for $140, or a 15 year battery for $300, or a 20 year battery for much more. In the end, the 7 year lead-acid batteries are just about always the best buy. A decent set of true deep-cycle flooded lead-acid batteries will usually last 10 years. I suspect your school may not have equalizied them every 6 months, or maybe just wasted money on inferior batteries. I'm surpised they didn't waste even more tax dollars on absorbed-glass-mat versions (AGMs).
I've got (at home) Rolls-Surette batteries from Canada - the best FLA batteries in the world. I've got their 10 year versions, that often last 15 years. Up north at a solar powered cabin I've got, I use Trojan T-105 batteries "golf cart" batteries. They are 8 years old right now and still working fine.
How come your school didn't just install a back-up generator - so they could not use it when power is out and give everybody the day off - like our's does?
You don't run appliances directly from solar panels except with a few exceptions. They are there to make power off and on, not steadily and consistently. If you have grid-tie, you can use all the power you want. It comes from the power company when a high surge is needed, and then the solar panels "pay them back" over time. The power company acts like your own huge "private battery bank."
I've got a 220 amp welder and a 6 horse air comppressor and can use both from my battery bank- via my dual inverters (10,000 watts, 220 volts). I probably never would, but I could. If power was out, and my battery bank was running the house - and then - for some reason I felt a need to run my air compressor AND welder . . . I'd fire up my 17KW diesel generator or hook my tractor to my 15KW PTO generator.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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