Big problem with dairy farms is milking when power is out. Not many farms with the man-power to milk-out 60 or more cows with no electricity and vacuum pumps. They can get sick pretty fast if not milked. The Amish in my area use diesel engines powering hydraulic motors to run their vacuum pumps for milking.
If the installer told you the batteries last forever with care -he's full of it. Some of the best are made in Canada by Rolls-Surette. With care they tend to last 10 years when not used heavy.
I've got twin Outback Inverters and had one problem so far. A thyristor burned out and I replaced it myself. Outback sent me the parts free but I had to do the work. To be technical, my system has a full 5 year warranty but the installer was not very skilled and I did not trust him to pull apart the inverter and fix it properly. So, I did it. When his crew first did the installation - I had to rewire some of it so it would pass inspection. They made many screw-ups.
Solar and battery backup has worked great for us. But, we do not use electric hot water heaters or clothes dryers. Biggest power draw is - 220 volt well pump, wood furnace blower motor, microwave oven, 42" TV, etc. We've been out three days already and had no problems. That was three days with NO sun, so we ran 100% off the batteries. My bank has 8 Rolls-Surette S-460 batteries. Not their best and not their cheapest either.
My battery bank is wired for 48 volts. So, I keep a 48 volt battery charger on hand just in case we do have a very long outage and I have to charge those batteries back up. I've got gas and diesel generators all over this place, so powering that battery charger would not be a problem.
If you are going to have a 24 or 48 volt battery bank, I suggest you buy yourself a charger. Not an easy item to find in a hurry. I've got two places on solar. One is 48 volts and the other is 24 volts. I have Iota chargers for both.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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