GSL BMPPT250-1 User manual

BMPPT250-1-R3
Page 1 of 4
Model:
BMPPT250-1
Unit 2, 110 Station Road, Seven Hills ,NSW, 2147, Australia
250W Solar Charger
Booster Maximum Power Point Tracker
Operating Instructions
Please read these instructions before use
This revolutionary maximum power point tracker solar charger
was designed using the technology that won GSL Electronics the
prestigious “2008 EDN Innovation award”. A simple, compact, low
cost and highly efcient way to cycle charge 24V and 48V batteries
from low voltage or parallel panels.
BMPPT250-1 Unit
BMPPT250-1 Specications
Efciency Typical 95%
Panel Voltage 14V to 58V
Output Voltage (24V) 29V ± 1%
Output Voltage (48V)) 58V ± 1%
Panel Power Max 250W
Quiescent Current 0.04A
Thermal Protection Multilevel type
Dimensions (mm) 35 X 75 X 142mm
Indications LED display – battery OK / LOW
PATENT APPLIED FOR - 2010901565

Important Notes:
• On the panel side use wires suitable for at least 20A. If the wire run is going to be longer
than 3 Meters, larger wires should be used to limit voltage drop and losses.
• On the battery side use wires suitable for at least 10A. If the wire run is going to be longer
than 3 Meters, larger wires should be used to limit voltage drop and losses.
• Install the unit in a dry place out of direct sunlight and away from ammable liquids or gases.
• Battery fuse ( BF ) is always required and must be located as close to the battery as possible,
its sizing depends on the wire size and load ratings. Typically a 10A 60VDC fuse would do.
• Before connecting battery always check battery and PV panel polarity.
• This charger is intended for cyclic systems where the batteries are periodically loaded and is
not recommended for systems where the batteries are unloaded for long periods of time.
Page 2 of 4
Model:
BMPPT250-1 250W Solar Charger
Booster Maximum Power Point Tracker
Operating Instructions
Please read these instructions before use
BMPPT250-1-R3
Unit 2, 110 Station Road, Seven Hills ,NSW, 2147, Australia
BMPPT250-1 General Information:
• Green LED ON – battery charging and all normal.
• Green LED FLASHING – battery voltage low, below 0.9 of nominal voltage.
• This MPPT is designed to cyclic charge 24V and 48V rechargeable batteries ONLY.
• Custom oat and absorption voltages and times are possible but minimum orders apply.
• This BMPPT has a built in multilevel over temperature protection to improve product
reliability while maximising output power availability.
• The BMPPT will efciently cycle charge 24V batteries from 12V panels and 48V batteries from
12V panels or 24V panels
• Maximum open circuit voltage below 58V for 48V batteries and below 29V for 24V batteries.
• The lowest maximum power point required for operation is 14V

Page 3 of 4
Model:
BMPPT250-1
Unit 2, 110 Station Road, Seven Hills ,NSW, 2147, Australia
250W Solar Charger
Booster Maximum Power Point Tracker
Operating Instructions
Please read these instructions before use
Basic Wiring With Permanent Load Connection:
Note: First start up may take up to one minute.
Settings And Congurations:
Before installation check the position of the switch and adjust the switch to match the battery voltage of
your system. The switch is located through the hole of the faceplate of the unit.
For safety reasons this should only be changed whilst the BMPPT has been disconnected from both the
Panels and the Battery. Preferably before installation
We also suggest the switch be changed gently with a non conductive tool.
Always ensure that the Switch is set for the Correct Battery Type:
When looking at the unit face on (cable side) with the LEDs at the bottom of the unit:
LEFT position : for 48V batteries
RIGHT position : for 24V batteries
BMPPT250-1-R3
Front View Of Charger
48V Batteries - Left
24V Batteries - Right

Page 4 of 4
Model:
BMPPT250-1 250W Solar Charger
Booster Maximum Power Point Tracker
Operating Instructions
Please read these instructions before use
Unit 2, 110 Station Road, Seven Hills ,NSW, 2147, Australia
Warranty Conditions: The product is warranted to be free from defects in materials and workmanship under normal use and service for a period of 24 months from the
date of sale. This warranty covers defective parts and workmanship provided that the product is shipped prepaid to the seller within 24 months of purchase of goods.
This warranty is limited to the repair or replacement (at the manufacturers’ discretion) of parts and shipping prepaid to the original despatch destination. We regret that no
liability can be accepted for consequential or special damages of any kind howsoever arising in connection with products supplied by the seller. This warranty is in lieu of
all other warranties expressed or implied. No representative is authorised to assume for the seller any other liability in connection with the seller’s products.
MPPT FAQs
Q: What is a BMPPT?
BMPPT stands for Booster Maximum Power Point Tracker and is a specialised converter designed to maintain the PV voltage at
the level in which it delivers maximum power to the load or battery while at the same time boosting the output voltage above the
input. The nominal panel output power can only be ensured with the use of an BMPPT.
Q: When is the BMPPT required?
The BMPPT is required when the panel voltage is below the battery voltage such as when a 12V panel needs to charge a 24V
battery.
The BMPPT enables the parallel connection of panels which can make the system more tolerant to partial shading when compared
to series panel connection.
Q: What output can I expect from a 250 BMPPT?
The maximum bulk charge current with a 48V battery and 250W panel is approximately 5A, so you can expect about 20AH per day
which is close to 100W load for about 10 hours.
Q: Why are BMPPT used mainly in high power systems?
Until now and despite their overwhelming advantages BMPPTs have been excluded from low power systems because of cost. The
new GSL BMPPT specically designed for low power makes economic sense even in small systems.
Q: What sort of batteries should I use?
1. A deep cycle battery is a must due to the cyclical nature of solar systems with a recommended battery capacity of at least
100AH.
2. A larger battery will not only give longer run time during low light but also will be able to avoid available PV power being
unstored such as when the battery reaches the oat stage.
Q: How does PV temperatures affects charge current?
Temperature increase brings down the PVs maximum power point voltage resulting in lower panel output.
Q: What is the smallest panel size for the BMPPT250-1?
The smallest panel size recommended for the BMPPT250-1 is 20W, below that level the BMPPT will not function effectively.
Q: Is interference possible? And If so what do I do?
GSL’s BMPPTs produce far less interference than conventional solar regulator during the absorption and oat stages, that
is during most of its operating time, and its designed to comply with local and international EMI standards however some
interference is still possible. If interference occurs rst try and reorient the aerial or move the sensitive equipment away from the
BMPPT wires. Ensure the BMPPT chassis is grounded. Grounding a battery terminal may also help and nally you can try adding
ferrite clamps.
BMPPT250-1-R3