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17
April 2022
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Solar Stik® Inc.
Operator and Maintenance Manual for the 24VDC Li ESM 2000
Energy Storage Modules - An Introduction
Energy Storage Modules (ESMs or “batteries”) serve as the foundation for every Hybrid Power
System (HPS). When ESMs are employed in a power system, they can serve many different functions:
• Backup power for critical loads when the primary power source fails
• Power when periods of “silent” operation are critical
• Use of renewable power generation is desirable
• Decreased reliance on grid-utility power is desirable (peak shaving)
ESMs are also critical to the operation of the Inter-Connect network. They open the system
architecture to allow multiple technologies to operate in concert. When functioning ESMs are
connected within the Inter-Connect Circuit, their collective voltage is what allows other components
within the network to perform their functions.
While ESM roles may vary widely, their function is quite simple: ESMs charge and discharge (storing
and dispensing power) repeatedly, over time
.
This is called “cycling”. Batteries have an inherent, finite
cycle-life and several factors determine how many cycles a battery can endure before it is depleted
.
These include, but are not limited to:
• Operational environments and conditions
• Charging and discharging rates
• Storage conditions (even though it may not be actively cycling, the chemical reaction in a battery
never stops.)
All batteries have a finite lifespan and as such it must be understood that batteries are
“consumable” parts of the HPS
Keys to ESM Performance
• Multiple ESMs should be connected in parallel into a single bank.
• All ESMs in a bank should be similar in health (age, cycles, capacity) when possible.
• Do not mix Li-ion batteries and lead-acid or most other types of Li-ion batteries because their
operational parameters and capacities are likely to differ.
• ESMs are charged most effectively using Solar Stik HPS power management components. Any
other charging device must be rated for the ESM’s storage capacity, voltage, and current limit.
• Charge ESMs fully before placing into storage.
• Turn ESM 2000 POWER switch to OFF when ESMs are connected to an HPS that is idle/not in
use to prevent overdischarge due to unchecked self-discharge.
• Do not submit to excessive mechanical stress.
THEORY OF OPERATION
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