We’ve been slammed the past few days; hence no blog. Thought I’d post of couple of photos of one or our most impressive “looking” upgrades: Our new solar panel rack!
Took us a whole day and we just got our tent/shed today. Although not a structure of wood, it’s snow-load worthy. I hope it does what it says it does.
We have a new sweet addition to the family. A six month old kitty! Took him to the vet today. All is well. Getting snipped in a few weeks.
We discovered through a process of elimination, that, as I suspected, recharging the RV house batteries is taking up a huge chunk of our energy consumption. I have not seen ONE other person mention that when calculating their energy load for their solar setup.
We’ve also learned that almost ALL inverters shut down the battery bank WAY too late after the batteries are almost dead. An industry wide problem almost NOBODY is addressing, except Missouri Wind and Solar. They are the ONLY company that makes a low voltage shutoff relay. It turns off the power to the inverter when your batteries are at fifty percent or you can adjust to your preference (at your own risk).
Five o’clock this afternoon, we get home in overcast weather and I, as usual, check the status of our new solar power system.
To my dismay, the voltage is only showing 11.9. Definitely not any sort of a charge. In fact, that’s about a 40 percent state of charge (SAC) of the batteries. Great big sigh. We thought we had everything up and running smoothly as of the other day; but not so fast.
Unless you have a professional or someone who’s experienced in solar technology do the job for you, be prepared for an onslaught of information in setting up your battery bank.
The battery bank or array is the place where all of that free energy will be stored until you use it. If it isn’t working properly, all of that sunshine is going somewhere besides your refrigerator. Setting it up and diagnosing problems can be overwhelming and confusing.
In my quest for guidance online, I’ve learned that the most talked about and hotly debated subject is the battery bank or array. I think it’s the Achilles Heel of most systems.
There is an overwhelming list of variables to consider and possible issues that may come up such as:
How to wire the batteries correctly
How many solar panels at how many watts are needed to recharge the bank in a day?
How many batteries will you need to meet your power needs?
How to calculate your power needs
How to equalize the batteries in your array or does your controller do that for you?
What type of battery is best and how much of it’s charge can you use to prevent rendering it useless?
How to tell if it’s useless (If even one battery is toast, you’ll have to go out and buy another four or eight, or however many all at once because they need to be put into commission at roughly the same time)
The energy losses inherent in the system also need to be factored in when either calculating your usage or production of electricity.
Try browsing any forum with a question and you’ll most likely discover that for every one asked you’ll find multiple answers from varying personality types such as:
The guy with the overly scientific approach who posts mathematical formulas broken down into several categories depending on the type battery, panel, geographical location and whether or not you like peanuts
The guy who just slams in a one-liner that “your batteries are dead, done, depleted, sulfated” (death sentence for a battery).
Which answer is right?
Since it appears we aren’t able to maintain a charge once we plug in, our next step is to check the batteries themselves to see if they are only carrying a surface charge. That is a temporary false state of charge that quickly diminishes after either a pull is introduced or it just sits for an hour at which point a second reading reveals a significant drop in voltage.
We’ve had batteries tested at various dealers while still carrying a surface charge and were told the battery was good. Then, upon asking for them to be retested later, they were found to be bad.
A properly working battery bank is crucial to a solar power system. They hold the juice until you need it but they can be complicated. Learn all you can about them and how to take care of them if you want to get the most efficient use of your solar setup.
Where does the rainbow connection come in? An old RV repairman recently barked at me after I asked how him how to do the wiring on a water pump. He snapped “red is red and black is black”. My ass it’s that simple. Electrical wiring might as well be rainbow colored.