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First published: July 14, 2009
Major revision: September 9, 2010
Last updated: November 5, 2016
90% technical decisions + 10%
preference/priority/justification
Aspects:
scientific, technological, industrial/market, societal, political, economic,
ergonomic, psychological, physiological
Tech specs: electrical & electronic/software considerations—charging supply source, capacity (WH req.), charge
rate objective, operating temperature, peak load, self-discharge, energy density, longevity,
unit cost & TCO
8 Specific Scenarios: police radio fleets,
photographer/videographer operations, extended UPS with generator integration incl. hot/warm stand-by sites, laptop/tablet
fleet management, emergency preparedness, RVs &
off-grid homes, RC aircrafts, USB charging issues
case details
- electrical
- typ./max consumption wattage
- various D.C. voltage(s)
- consumption pattern & schedule
- torque/inductive load?
- environmental
- type of structure (if any)
- ambient temperature range
- insolation (not insulation!)
- site characteristics & constrains
- attended frequency & serviceability
- nearby power source?
- communication link for monitoring?
- jurisdiction & access
- applicable regulatory requirements
- special security & safety
considerations
supply strategy
- disposable
- rechargeable, at base
- swapping
- donor battery (booster pack)
- rechargeable, on-site in-place
- solar panels + regulator
- generator: AC 110V or automotive 12V
- intermittent utility hook-up
- thermoelectric generator (Peltier module)
battery type (technology + form factor)
- lead acid
- Ni-Cd
- Ni-MH
- Li-ion
- LiPo
- Alkaline rechargeable
- power density in weight/volume, internal resistence, custom/18650/19670
(protected), cost per capacity
scheme
- custom step-up/down voltage(s)
- double-conversion: inverter (110V UPS) + AC
adapter(s)
- pure sine wave required?
- SCR dimmer considerations
- USB-based +5V DC as intermediary
- PoE (power over ethernet)
- serialized charging vs direct cell
access
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