On April 2nd I wrote about our plans to install an off-grid solar system with Aquion batteries on our new bamboo home on the Big Island of Hawaii. It seemed we had little choice. Off-grid solar was less expensive than hooking up to the electrical grid.
Seven months later, we live in the home and monitor our 2,475 watt off-grid system on a daily basis. Nine 275-watt panels are mounted on the south-facing roof and an Outback Inverter system and six Aquion 48-volt batteries manage the electrical storage and conversion to the usual AC (alternating) current of our 1,180 square foot home.
We rented another home for the 9 months it took to get through this building project that was also off-grid solar. It had lead-acid batteries and I had a taste of monthly checks of the batteries and addition of distilled water. I could hear the boiling liquid in the batteries on sunny mornings. I used a hygrometer to check the condition of the batteries with coaching from a neighbor. I knew to be careful with any acid spillover and scrubbed away corrosion with a bicarbonate of soda bath. When our electricity suddenly disappeared one day, I asked our solar contractor at the new house to look at the system. He found a loose connection where acid had totally eaten away the bolt connection. He quickly fixed it and it all worked again. It was a lesson in the importance of careful maintenance with lead-acid batteries.
I generally like new technologies because they often demystify existing technology. I am a new adopter with home computer devices but I am not usually a new adopter with mechanical or electrical systems. Off-grid solar systems seemed to teeter on that uncomfortable edge of being a little too technical for me. But we took the plunge into off-grid solar for good reasons. We like getting away from fossil fuels. We love supporting new technologies that make sense. We love the idea of not having an energy bill monthly. It was simply cheaper up front with the great tax credits from the state and federal government. So, HOW DID IT GO?
It’s been great, actually.
The entire system we ended up with cost $24,000, but tax credits give back $11,500. Payback for this system from savings with no electric bill is likely about four or five years.
We simply have no maintenance requirements with the saltwater batteries. Checking the battery storage level daily is reassuring, but is not really necessary for the system performs as promised. RES, a family-owned business in Honokaa, has been our contractor and their installation work went very well and it all works as expected.
Certainly, there will be lessons to be learned over time. Aquion batteries are sealed, require no maintenance and should last 20 to 30 years, but time will tell. This is technology available only in the last few years so we
took the risk of seeing how long these batteries will last, having only the manufacturer’s projections.
The tax credit incentives provided by the federal government and most state governments are “window in time” opportunities. Eventually the window will close and those incentives will disappear, but they are making affordable solar energy systems a great bargain in most situations. If you haven’t looked into the costs and potential return on investment, now is the time to take a look. The sun will always be shining for you but you have to have the right system to take advantage of it for your home or business.
– Tim Merriman