It is late August and there are storms in the gulf. Due to the weather for the last few days, my battery has not been to 100% SOC (state of charge). Lead acid batteries need to get there once every three or four days. The forecast for today is 75% cloud cover and my battery was at 83% at daybreak. The lack of sun also did not trigger a mini-split operation for two days and the inside humidity was at 85%. Temperature was OK, but it was stuffy. So I hit the generator for about 1.5 hours.
My inside humidity dropped to 65%, in the “normal” range. My battery hit 90% and I expect the sun to top it off within a few hours, even under the cloudy conditions.
This is an example of the load management and adjustments required to live without a grid power connection. If you have a grid connection, I can configure the system to take care of this automatically. You will have to play a role when the grid is down, but it is completely invisible if the grid is there.
Lithium batteries make off-grid a lot easier. They can operate at a partial state of charge without a problem. However, the mini-split air-conditioner is still operated from solar, not battery. This means that you won’t get any air-conditioning and humidity reduction unless the sun is out in force. So even with a lithium battery, you will still have to consider a generator run to satisfy that need. But a lithium battery will allow you to simply wait out many low-sun conditions without generator assistance as the sun will often come to the rescue. You are relieved of the lead-acid requirement to hit 100% SOC twice a week, and that is a lot of load off your mind!
Lithium batteries has been around for some time and we understand the technology well. However, they have only recently been introduced into the off-grid market at a reasonable cost level. Maintenance free AGM (lead-acid) are still a good option if you need to keep the initial cost down. But if you have the funds, lithium is well worth considering.
Renewable Energy & Solar Power Solutions
Grid Tied Solar PV
Grid Tied Solar PV (Non-Battery) While our focus is on OFF-GRID SOLAR POWER SYSTEMS, Solar Tech has installed some of the largest grid-direct systems in Alabama. GRID-TIE solar systems (often called grid-interactive or grid-direct) harvest solar energy from the sun and convert it to electricity … Learn More
Heating Water
Those interested in reducing your utility bill should start here. If you are heating water with electricity or gas, in the next 20 years you will spend over $30,000 more than necessary to heat water. Let the sun heat your water and spend that money on something else. Start here if your objective is … Learn More
Off Grid
People are interested in off-grid power for a variety of reasons. Some build a house so far from the power lines that solar power is the economical option. Others make a conscious decision to break their grid-addictions and live a simpler, less complicated life. But most just want an option. This … Learn More
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