So far, the ‘cold box’ is staying at 46 degrees using one 100 Watt PV panel. The full credit goes to the authors of Re-Innovation Please keep them comin.PlainsMedic,,,, if you do a cost comparison on 12v dc V 120 v ac to set up ,i found the 120v ac the winner ,and the ammonia frig will suffer in hot weather ,i used one for cow meds, and had problems ,, the cost of loss of vaccines more than offset any difference in the long run ,,, i have eleven inverters all have a specific use , 220 v. 5k for well , 120/220 4k for special need , 120v 3k day for cabin ,120v 1.2 k for night lights and deep cooling freezer ,all can run off one battery bank ,all told cost me less than one of the high price invertersQuestion for ya; You mention sine wave inverters. Might even put in a 220VAC GFI, just in case.I am not ‘off-grid’, per se. However, you can use a wide variety of electric devices as needed. Why?
I also have a ‘secondary system’. Won’t be a bad thing unless other people keep winning the lottery.I agree on the right sized inverter. My bad. …developing Eartheasy.com using a dialup internet connection on a phone line strung through the woods was challenging…Today, with the help of a local expert on off grid home solar power and alternative energy systems, we have the best of both worlds. A box on the porch houses the charge controller, inverter and batteries. I’ve never actually played with any. Are they modified sine wave or pure sine wave. With our small system, we’ve been able to power quite a bit just rotating 2 batteries that we trickle charge at home between trips to the cabin. The oldest uses of solar energy is for heating, cooking, and drying.Today, it is also used to make electricity where other power supplies are not there, such as in places far away from where … Because it would require knowing your entire installation, expectations, and demands thereof.– Though there are many ratings/specifications to consider, the basic primary rating of an inverter is power.
This is a simple design worksheet for stand-alone solar PV systems. For instance, a modern 12v car radio can provide plenty of volume in a home setup! I prefer a real disconnect to the grid. This is good.As long as you understand how your system works and what to do and what not to do to it, you are good to go.
Half the voltage, twice the current. full time power? Just watch the line length. I had to tweak it from factory settings to be more realistic with what was actually happening. Plug and play. Inverters are available in a wide range of wattages for different size systems. Some are so called “cheap”, while others are very good.
Be sure to fuse circuits appropriately and keep an eye on bank voltage, since this equipment will continue to operate even when the bank really should be recharged. We suggest that you follow the recommendation as stated in the module instructions with regard to installation.We use a Morningstar ProStar30 Charge Controller that automatically adjusts the amount of power running into the battery. Biggest drawback was I had battery problems and had to re-wire everything to 12 VDC. In spite of the baskets and shelves, everything tends to end up on the bottom.I’m sure a higher elevation and more northern latitude makes a huge difference.
Pure sine wave is necessary for electronics; computers, radios, amplifiers, etc. This enables us to use standard electric devices without the need for adaptors. Mother Nature will do as she sees fit. I’ll have to think on that a while. Or said another way would you use a Mini Cooper with a tow hitch to pull a small trailer OR use it to try to pull out a Double Decker Bus out of the ditch? The really efficient dc fridge/freezer units are chest type. Your better effort, IMHO, is to search a lot. I should have seen that. As you know, chest freezer/refrigerators are far more efficient than uprights. There’s a calibration factor that you can fudge with while getting it accurate with remaining state of charge for your battery bank. That gives you an acceptable margin, IMHO. The charger is in the same box with the batteries and other components. Small comforts but very useful if the power is out at home. Same thing with refrigeration, dc appliances work just as well as ac. I have Aquatec though there are several others with excellent reviews.I read quite a bit about peltier units, awhile back. One of several, minor mistakes I’ve made along the way. Any DC appliances will help to make your system WAY MORE efficient.