Solar Batteries Guide
In this Guide you will learn the differences between the types of solar batteries, how they fit into a Solar Energy System, how much batteries is enough and more.
What is a Solar Battery?
A battery is an electrical storage device. Batteries do not make electricity, they store it, just as a water tank stores water for future use. As chemicals in the battery change, electrical energy is stored or released. In rechargeable batteries, this process can be repeated many times. Batteries are not 100% efficient - some energy is lost as heat and chemical reactions when charging and discharging
For a Solar System we need to do the Following:
- Charge the battery using the Inverter during the day, using the sun.
- Use Energy from the battery at Night when there is no sun
- Then Recharge it every day and repeat this over and over again.
Deep Cycle refers to DOD (Depth of Discharge)
Deep cycle batteries are designed to be discharged down as much as 80% time after time and have much thicker plates. The major difference between a true deep cycle battery and others is that the plates are SOLID Lead plates - not sponge. This gives less surface area, thus less "instant" power like starting batteries need. Although these can be cycled down to 20% charge, the best lifespan vs cost method is to keep the average cycle at about 50% discharge
Today, lithium-ion is the fastest growing and most promising battery on the market. Lithium-ion batteries is the future of solar storage. They waste significantly less power when charging and discharging. The cycle is deeper using more of their capacity with a long lifespan. they are lighter, smaller and they don’t produce as much heat as other Lead Acid batteries which are perfect for setups that have space restrictions.
- High energy density - potential for yet higher capacities.
- Does not need prolonged priming when new. One regular charge is all that's needed.
- Produce more cycles (5000 – 7000)
- Can produce 100% of the stored energy
- Lifespan from around 10-20 years
- Relatively low self-discharge - self-discharge is less than half that of nickel-based batteries.
- Low Maintenance - no periodic discharge is needed; there is no memory.
- Specialty cells can provide very high current to applications such as power tools.
- Requires protection circuit to maintain voltage and current within safe limits.
- Subject to aging, even if not in use - storage in a cool place at 40% charge reduces the aging effect.
- Expensive to manufacture - about 40 percent higher than other battery types.
- Not fully mature - metals and chemicals are changing on a continuing basis
What are the best Battery Brands?
We Strive to only sell the highest Quality Battery Brands, Take a look at our variety of Battery Brands! (We Recommend these Brands)
Pylon Technologies, Co. Ltd founded in 2009 is regarded as one of the best LFP (lithium iron phosphate) battery deployed in ESS (energy storage system).Pylontech’s battery products and solutions have been used for high-end vehicles, cloud computing systems and telecom power backups, new energy storage systems and electric vehicles.
- Top Quality.
- Specializes in Lithiom ion Products.
- Used by Big Companies.
- Popular Company.
- Fantastic Value for Money!
Dyness owns the most sophisticated team with top class experts from the industry. They devote themselves to responsible engineering of the safest, greenest possible future for you and your family.
Our Powerbox will store excess power produced from solar in daytime, it can be used at night to increase greater energy self sufficiency and security, or used at peak time to reduce household electric charges. Dyness brings our latest Battery Energy Storage System (BESS) Powerbox to Australia at affordable price and top class quality.
Let’s start using the sunshine by schedule!
Dyness’s mission is to facilitate a healthier energy chain at reasonable cost, consumers and utilities could all get out of the conventional fuels that hurt our planet, where in stead, the clean energy takes charge.
Victron designs and sells inverters, chargers, and related power conversion products for automotive, industrial, marine, mobility, off-grid/solar, self-consumption, and telecom markets. Its products include accessories, autotransformers, batteries, battery isolators and combiners, battery monitors, battery protectors, cables, chargers, DC-DC converters, DC distribution systems, inverters/MPPTs, isolation transformers, panels and system monitoring products, solar charge controllers, solar inverters and panels, and transfer switches.
- Internationally recognised
- High Quality
- Good support
- Good reputation
- The lithium-ion range is good quality at an affordable price
Established in 2012, AlphaESS specializes in advanced battery storage products and intelligent energy management solutions for residential and commercial customers.
With years of experience in both the clean energy and battery industries, the AlphaESS team helps families and businesses reduce their electricity costs and achieve energy independence through their own power generation, storage, and optimization.
AlphaESS products have spread to more than 50 countries through our partners, benefitting thousands of customers.
“Your Smart Energy” is our vision. AlphaESS is pursuing an ambitious goal of building an “energy internet,” where everyone can produce their own clean energy and lead a sustainable lifestyle.
Team Freedom Won is driven by challenge!
Developing and growing the adoption of green energy solutions and electric mobility globally.
Freedom Won, a South African company founded in 2011.
The Lithium battery technology used in Freedom Won’s EV conversions has proven so successful, we have further developed solutions for static energy storage using this same technology. Our Lite battery sells our Lithium Iron Phosphate energy storage solutions in an integrated, compact and stylish wall unit for residential and business use, to protect against load shedding and outages as well as integration with solar panels to reduce or eliminate utility power usage.
Freedom Won has Africa’s unique power challenges covered with our leading range of superior Lithium Iron Phosphate (LiFePO4) energy storage solutions. Our solutions are fast becoming the preferred choice as the huge advantages of using this proven technology become more widely known.
How Many Batteries is enough for a Solar System?
Battery Bank Calculator
The exact math for sizing your battery system is based on your daily power usage and the battery type. Based on usage of 10kWh per day, here are some examples:
Lithium ion Battery
10kWh x 1.2 (for 80% depth of discharge) x 1.05 (inefficiency factor) = 12.6 kWh
Battery capacity is specified either in kilowatt hours, or amp hours.
For example, 24 kWh = 500 amp hours at 48 volts → 500 Ah x 48V = 24 kWh
It’s usually a good idea to round up, to help cover inverter inefficiencies, voltage drop and other losses. Think of this as the minimum battery bank size based on your typical usage. You may want to consider 600-800 amp hours of capacity, based on this example, depending on your budget and other factors.
Battery banks are typically wired for either 12 volts, 24 volts or 48 volts depending on the size of the system. Here are example battery banks for both lead acid and Lithium, based on an off-grid home using 10 kWh per day:
For Lithium, 12.6 kWh is equal to:
- 1,050 amp hours at 12 volts
- 525 amp hours at 24 volts
- 262.5 amp hours at 48 volts
Here's what you need to do:
- Start with looking at your electricity bills
- Take the last 12 months and add the kWh together
- Divide the total kWh by 12 to get your daily average
- From that average, figure out what portion you use during day and night
- Nighttime usage is required to be cycled through the use of batteries
Changing the voltage of the battery bank:
If you were to use a 24-volt battery bank (2 x 12v in series) you would require a 24 volt 416 Amp battery bank, and so on. This is where you choose the required battery for your needs.
You commonly get 100A or 200A batteries , so you would require 4 x 12v 200A batteries to get a 24v 400A battery bank (2 in series and 2 in parallel).
For a 48v bank, would be 4 in series, so 48v 200A bank .
They all give the same amount of power, just differently.
Then you need to decide how much backup you need. For Off-Grid you will need to calculate for how many days you want Energy
The Cost of Batteries
This depends on what Brand you go with and how much storage you will need.
- The Average Price of a lithium-ion battery will cost around R20,000
We have a wide range of lithium-ion batteries available here at JAP Solar
We can Assure you that we sell the Highest Quality Products at Unbeatable Prices!