Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Pulse Width Modulation (PWM): PWM charge controllers can be considered an electric switch between the solar panel and battery packs, programmed to only allow a pre-determined current into the battery. The controller slowly reduces the amount of power going into the battery as they approach maximum capacity. PWM Charge Controllers do not adjust voltage, meaning the batteries and panels must have compatible voltages in order to operate properly. This makes this type of charge controller suitable for smaller solar applications, or installations that feature lower voltage panels and limited size battery banks. PWMs are a more affordable option but will result in a lower power production from the PV .











Image Modified



PMW

Controller

MPPT

Controller











Image Modified



Charge Method

3 stage

PWM 

Battery Charge

Multi-Stage MPPT

Conversion Rate
75%-80%

Turn solar to electricity

99%

Size
20A-60A

Ampere Rate

30A -100A

Scalability

<2KW

small solar system

Product Range

>2KW

Large power system


Cost
65$

Average price

120$
PWNMPPT
Advantages
  • PWM Regulators have a longer and proven history.
  • PWM Regulators are a more simple structure and are more cost-effective.
  • Easily deployed.
  • Maximum power point tracking algorithm increases power conversion rate up to 99%.
  • 4 stage charging is better for batteries.
  • Scalable for large off-grid power system.
  • Available for solar systems up to 100 Amps.
  • Available for solar input up to 200V.
  • Offer flexibility when system growth required.
  • Equipped with multiple protection devices.
Disadvantages
  • Low conversion rate.
  • Input voltage must match battery bank voltage.
  • Less scalability for system growth.
  • Lower output.
  • Less protection.
  • High cost, usually twice a PWN.
  • Larger Size than a PWM regulator.

...

  • If possible, install panels on roofs of buildings, and in areas where persons do not frequently visit - avoid roof top terraces or resting areas.
  • Install solar arrays inside of compound spaces, inside the safety of a perimeter wall wherever possible. Even if arrays are inside a compound wall, there should be some form of signage and barrier fencing to prevent visitors or casual labor labour from accessing the area. 
  • If solar arrays are installed in the open in remote locations, then a separate security fence or wall will need to be built around the outside. The equipment is expensive, but it can also harm humans and animals passing by. Persons unfamiliar with solar panels may be drawn close out of curiosity, so signage must be posted in the appropriate local language. 

...

  • RED R, (2002). Engineering in emergencies
  • MEDICINS SANS FRONTIERS, (2007). Electricity Support.
  • ENGINYERIA SENSE FRONTERES, (2006). Tecnologías de la energía para el Desarrollo.
  • MEDICINS SANS FRONTIERS, (2004). Energy Guideline
  • ACTION CONTRE LA FAIM, (2012). Generator Guideline
  • MEDICINS SANS FRONTIERS, (2002). Power Supply.
  • ACTION CONTRE LA FAIM. (2012). Energy management Guideline
  • SAVE THE CHILDREN. Electricity distribution, generation and renewable energy guide.
  • ACTION CONTRE LA FAIM, (2020). Solar pumping, Electrical design and installation.
  • INTERNATIONAL COMITEE OF THE RED CROSS and MEDICINS SANS FRONTIERS, (2016). Electrical installation and equipment in the field, Rules and Tools.
  • BP, (2000). Solar installation manual
  • MEDICINS SANS FRONTIERS, (2012) Electrical safety guidelines

Sites and Resources