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#1

wind & solar hybrid charge controller

in Fragen, Wünsche, Bugs und ihr Status 17.08.2015 12:29
von JerrBuss | 2 Beiträge

Simple 1 or 2 stage controls which rely on relays or shunt transistors to control the voltage in one or two steps. These essentially just short or disconnect the solar panel when a certain voltage is reached. For all practical purposes these are dinosaurs, but you still see a few on old systems - and some of the super cheap ones for sale on the internet. wind & solar hybrid charge controller Their only real claim to fame is their reliability - they have so few components, there is not much to break.

3-stage and/or PWM such Morningstar, Xantrex, Blue Sky, Steca, and many others. These are pretty much the industry standard now, but you will occasionally still see some of the older shunt/relay types around, such as in the very cheap systems offered by discounters and mass marketers.

Maximum power point tracking (MPPT), such as those made by Midnite Solar, Xantrex, Outback Power, Morningstar and others. These are the ultimate in controllers, with prices to match - but with efficiencies in the 94% to 98% range, they can save considerable money on larger systems since they provide 10 to 30% more power to the battery. For more information, see our article on MPPT.

Most controllers come with some kind of indicator, either a simple LED, a series of LED's, or digital meters. Many newer ones, such as the Outback Power, Midnite Classic, Morningstar MPPT, and others now have built in computer interfaces for monitoring and control. The simplest usually have only a couple of small LED lamps, which show that you have power and that you are getting some kind of charge. Most of those with meters will show both voltage and the current coming from the panels and the battery voltage. Some also show how much current is being pulled from the LOAD terminals.

• Reliability
String inverters are an established technology with proven reliability, while micro-inverters are a relatively new development and reliability is not yet proven.
Inverters are the most common point of failure off grid inverter in a photovoltaic power system. Many micro-inverters introduce a higher chance of component failure. Replacing a single central string inverter is far easier than replacing a micro-inverter behind a solar module on the roof.
As micro-inverters are mounted on the back of panels on the roof, they are exposed to the elements and heat of the solar modules. The inverter’s performance and life may be affected by these conditions.

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