"Ecodirect.com is the best ! They are such
a pleasure to work with! They offer all the
best brands at the best prices. Special
thanks to Renée who always answered my
questions on the spot, sharing her real
knowledge and giving me the best advices."
Serge (Tahiti, French
"The experience I had with my purchase was
very good. The items I ordered arrived when
I expected & were packaged well. My overall
purchasing experience was very
- Thank you,
"I recently found EcoDirect & have been
extremely happy with their service. They
have had all the PV modules, inverters,
optimizers and accessories I needed. They
provide excellent customer service & turn
orders around very quickly. I have switched
to EcoDirect for all my parts & materials
orders. Highly recommended."
"I wanted to let you know I am very pleased
with the service you gave & the quality &
condition of the solar panels I received
from EcoDirect. I will purchase more items
in the future from EcoDirect and will be
sure to tell others about your fine
"Thanks EcoDirect! My solar system is up
and running; waiting for City and San Diego
Gas & Electric inspections this week; so
far so good!"
"I enjoyed ordering what I needed. It was
simple and fast, no issues what so ever. If
I need something else and its at a good
price, I will defiantly order from here
again. Also the shipping is at a good
My shipment arrived on time, as predicted.
Very, very good performance by EcoDirect.
What more could you ask for from an online
material supplier? Looks like the quantity
from Quick Mount is spot on & the rails
were bundled safely. EcoDirect will be my
recommended source to my friends &
neighbors for solar. - Thank you, Jim
"Over the past couple of years, I have
purchased several items from Ecodirect and
I have always been happy with their
customer service and prompt delivery of
"I am very satisfied, everything was as
As a battery gains a higher level of charge, the best voltage at which to charge it changes. Charge controllers improve battery life by tracking a battery's state of charge and adjusting charging voltage accordingly.
The charge controller regulates the electric current that is flowing into and out of the battery bank, motor, or pump. By controlling the rate of electric current, charge controllers prevent overcharging and can protect against over-voltage which could damage the battery or motor. A charge controller can also prevent totally draining ("deep discharging") a battery, or perform controlled discharges, depending on the battery technology, to protect battery life.
Maximum Power Point Tracking charge controllers (MPPT) and Pulse Width Modulation (PWM) charge controllers are two types of charge "regulators" for renewable energy systems. They regulate the flow of electricity from the power generation system into the load or storage system. MPPT charge controllers are the most efficient type on the market but are also more expensive. MPPT and PWM technologies are not mutually exclusive, you do not have to use one or the other.
charge controllers use both technologies, but adding MPPT circuitry to a charge control increases the cost. When choosing the right solar charge controller, you'll need to consider how many panels you are using, what your battery bank power storage capacity will be and how much load your power system will create. You should also consider how long you will need to run the system (years). The annual power gains from an MPPT charge controller can offset the cost savings of a controller only using PWM in many situations. But a properly matched PWM can be much more cost effective especially for smaller installations.
MPPT charge controllers have the best performance, but they are more expensive
Why do MPPT charge controllers have the best performance? Because they allow your solar panels to operate at their optimum voltage levels in varying light conditions; summer, winter, morning, noon, cloudy etc... The MPPT charge controller takes the voltage output of the solar panels, and compares it to the battery voltage. It then figures out what is the best voltage to get maximum AMPS into the battery. Remember it's the AMPS that matter. Said another way, the MPPT controller tracks the best voltage level and then down converts it to the voltage of your system (12, 24, 48VDC). This "tracking" of the optimal power point improves performance by as much as 30%. PWM charge controllers on the other hand, reduce the voltage from the solar panel to that of the battery bank resulting in a decrease in efficiency. The efficiency loss depends on the size of the voltage mismatch between your panels and batteries.
Another benefit of
MPPT charge controllers is that many can accept high input voltages (up to 120+V DC) and efficiently down convert the DC voltage to that of your system (e.g. 12, 24, 48VDC, etc) which means you aren't losing any generated power and you are able to use what you generate more efficiently. Additionally, using a much higher DC voltage on the input side allows you to use thinner wire, decreasing your wire cost and making installation easier.
PWM charge controllers are less expensive and you will find a wider selection of models available. They are ideal for smaller systems where price point is critical or where the additional power is not really needed. Remember, your solar charge controller is an integral part of your system, stick with the brand names from reputable dealers for safe, long term success with your solar electric project!