Batteries

What Voltage Should My Battery Bank Be? 12, 24, or 48.

August 14, 2018
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The most common question I get as a solar consultant is… What voltage should I use for my battery bank? And Why? Almost everyone who is new to solar, wind or micro-hydro assumes that 12 volts is the way to go. It seems obvious. You can buy 12 volt lighting, 12 volt coffee makers, 12 […]

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Battery AH Ratings. C5, C20 and C100. What Does This Mean?

September 9, 2017
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Why Are Batteries Rated in Amp Hours (AH) and How Can One Battery Have Different AH Ratings? Part of designing an independent power system is calculating the amount of amp hours (AHs) your battery bank will need to keep your system operating between charges. All manufacturers provide amp hour ratings for their deep cycle batteries […]

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Battery Bank Equalization

December 3, 2016
Battery Equilization

Routine equalization charges are vital to the performance and life of a flooded lead acid battery… particularly in a solar, wind and less so in a micro-hydro power system. During battery discharge, sulfuric acid is consumed and soft lead sulfate crystals form on the plates. Learn more about making your battery bank last as long […]

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How To Make Your Batteries Last as Long as Possible

September 12, 2015
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Your battery bank will likely be one if the most expensive components of your “off the grid” energy system. They are also the only piece of the system that will need replacing on a regular basis. Every extra day you can squeeze out of your battery bank will reduce the overall cost of your renewable […]

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Why 120/240 Volt 60hz (or 230 Volt 50hz) Generators Are Not Great Battery Chargers

January 13, 2015
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Using a 120 volt or 120/240 volt (or 230 volt) single phase generator to charge your batteries is very common, inexpensive to purchase and horribly expensive to operate. BUT you must expect to pay anywhere from $2.50 to $5.00 per kWh when using a single generator to operate your home and charge your batteries. If […]

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Our Steam Engine / Battery Charger

December 8, 2014
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We bought a stream engine in 2011 with the hopes of someday using it as a backup for charging batteries if gas and oil were ever to become in short supply. Our biggest problem has been to find a wood boiler that can produce enough steam to operate the engine for long periods of time. […]

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Using Your Generator to Charge Your Batteries

September 28, 2013
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There are going to be many times when the sun isn’t shining, the wind isn’t blowing and your batteries are low. The only choice you might have is to charge your batteries using your fossil fueled generator. As you may already know, there is not a more expensive method of battery charging than using a […]

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How to Find the Defective Battery in Your Battery Bank

September 24, 2013
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It only takes one bad battery to bring your off grid power system to a complete halt. Even in systems that have 8, 16, 24 or even more batteries, one defective battery can drain every good battery and leave you powerless. Unfortunately it is not always easy to find the battery causing all the trouble. […]

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The Best Choices for Your First Solar Battery Bank

September 18, 2013
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You will make a lot of mistakes in the beginning of your “off grid” adventures and your batteries will pay the price whether they are deluxe and expensive models or decent quality and cost effective. If your solar installer/designer tries to sell you a “high end” (and very expensive) battery bank for your first energy […]

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Are My Batteries Really Full? How Can I Be Sure?

September 5, 2013
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You would think that knowing your batteries are completely charged is straightforward. However the state of charge a.k.a. SOC of your battery/battery bank it is not even close to being simple. This short article will explain why. Here are some of the common industry practices: BATTERY “AT REST” VOLTAGE Using the common “at rest” voltage […]

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Dump Loads for Solar, Wind and Microhydro

May 2, 2013
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Dump loads a.k.a. diversion loads are are an important part of the off grid electric system. Almost all wind and water turbine installations will require them and most solar installations can benefit from a dump load. As we discussed in the dump load intro, a dump load is simply an electrical device (load) to send […]

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Skystream Battery Charging How To

April 18, 2013
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The Skystream made by Southwest Windpower is a grid tie wind turbine that is designed to produce 240 volts AC at 60HZ (or 50HZ)  no matter what speed the wind is blowing. It does this by taking the wild AC from the alternator, rectifying it to DC and inverting back to AC. It is quite […]

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