Livre Power, Lda.

Junho 03 2011

Today's post aims to answer two questions. Here they are:
1 ª. "Assuming I have a 12 volt battery, 80Amp, finished loading, the load at 100%, you connect the inverter 12V/220V. How long does it take to download if you connect a 100W lamp? "
2 ª. "Assuming that the turbine operates at a constant speed, producing on average between 12 and 14 volts, what is needed here charge controller?"
Responding to the first question is difficult to say with certainty how long it would take to drain the battery, as there are several factors that can influence the response. Since then, the state itself that is the battery. If the battery is new more energy accumulates, but if you have many years of life and has been the subject of many charges and discharges are not going to accumulate a full load. In the latter case, even if the charge controller tells us that it is a load of 100%, I guarantee you will not last over half an hour to drain the charge.
Note that the inverter 12V DC / 220V AC also consumes energy in its operation and efficiency is never 100%, ie there is always a considerable amount of energy lost in the process of transformation. In fact, most of the units consume power when they are connected, though limited to power whatever. This type of consumption varies directly with the power inverter. A significant part of the energy is lost in the process of transformation in the form of heat, so that the units have ventilation systems, a thermostat, not too hot. These systems also consume energy.
Another issue to consider is the fact that investors have systems in place to protect the battery, disconnect the power supply voltage drop when the battery goes below certain values, for example, below 11.5 volts . Some are disconnected if the battery is x% of its total capacity. The purpose of these protection systems is to prevent the battery from being discharged too deeply, which has been shown will shorten its life. We must never forget that the cost of the batteries is a very substantial proportion of total investment when you're in the presence of off-grid systems.
The way the battery charges may also influence the time that the light will stay connected. If the charging process is slow it will take longer to download and the reverse is true.
If we illuminate the areas near the site of the accumulators (batteries), it is recommended that the facility is 12 volts DC, without treatment with the investor. The energy saving lamps 12 volts, are similar to light bulbs 220 volts AC, just cost more than three times for the same light output, but it saves the cost of the investor and there are important gains in energy efficiency.
If we illuminate an area far from the batteries, which requires the placement of the cables of considerable length, then it may be best option to use an inverter. Why? Because the resistance to electrical current flow is greater the longer the cable length and the smaller the larger the diameter. The higher the voltage the lower the resistance, therefore energy loss.
Therefore, to have the power of 12V DC at a distance, if you want to reduce energy losses, we have to spend much money on an electric wire of large diameter and may, in this case, be preferable to an inverter and cables thinner. The decision in these cases may not be easy. We must take into account economic factors.
The answer to the second question is easier. The charge controller is always necessary, as it protects, among other things, the battery overcharging. If the battery is receiving power continuously, even after being fully charged, it runs the risk of damage. In these situations, the controller prevents the entry of more cargo, protecting the battery. Well worth investing in a charge controller, even the cheapest. I recommend this regard, the post "Charge controller."
Is natural that issues related to questions answered. In this case, I appreciate that put them in the contact.

Arménio Carreira às 21:20
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