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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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