Terry Holtz

Terry Holtz is an application engineer at Aquion Energy.

Recent Posts

Partial State of Charge and Solar Telecom Batteries

by Terry Holtz on February 12, 2017 at 3:00 PM

In off-grid telecom sites with energy storage, the solar batteries are usually sitting at a partial state of charge, meaning they are not fully charged, nor fully discharged.

Solar-powered telecom towers commonly have lead acid batteries for their energy storage systems. However, operating or even sitting idle at a partial state of charge is problematic for lead-acid batteries.  As lead acid batteries discharge, the active materials transform from lead to lead sulfate - it is this chemical reaction that provides the requested power.  


Going Off the Grid: How Many Batteries Do You Need?

by Terry Holtz on August 31, 2016 at 1:23 PM


Many off-grid homes rely on solar panels for power. If you want to keep the lights on when the sun isn’t shining- without burning diesel- you’ll need batteries. How many? In this blog post, I’ll show you the process used by our Aquion Global Partners to size an Aquion battery system for your off-grid home.

Need some inspiration first? Check out these off-grid residential solar + energy storage examples:

redwood gate ranch hawaii microgrid

Insights from the HOMER Energy Microgrid 2015 Conference

by Terry Holtz on November 11, 2015 at 4:57 PM

Last month, I wrote about how to model Aquion batteries in HOMER microgrid modeling software. I recently attended HOMER Energy’s Microgrid 2015 conference in Canberra. While the HOMER training sessions were really helpful for my job here at Aquion, what was even more interesting was what the conference attendees--all microgrid and power industry professionals--revealed about the energy storage community in Australia. Read on for what I learned at the HOMER Microgrid conference.


How to Model Aquion Batteries in HOMER

by Terry Holtz on October 2, 2015 at 1:33 PM

Adding batteries to a microgrid isn’t as simple as sticking a nine-volt into a smoke detector. Whether you’re designing a new microgrid or changing an existing one, you must account for many interacting variables. Your electricity demand changes seasonally and even hourly. The availability and cost of solar, diesel, battery power, and grid electricity also vary. Each piece of hardware--even each brand of each piece--has its own capabilities and limits. How do you know if adding batteries to your microgrid will work, both for your system and your wallet?

This blog post will show you how to simulate Aquion batteries in HOMER, one of the tools we use to model customer systems.


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