Solar Harvester ltd

           Registered Office: - 61 Bridge Street, Kington, Herefordshire, HR5 3DJ

Storage Options

GoodWe Domestic DC Storage System with Pylon

This self-consumption package combines the GoodWe BP 2500 with a 2.4kWh Li-Lion battery from Pylontech.

The GoodWe BP series DC energy-storage system is compatible with most single phase on-grid inverters and therefore allows you to revisit most of your previous customers.

The Pylon batteries are modular. You can fit one and then add another at a later date if the energy needs on site change.

Retrofittable perfection

Batteries Explained

 Batteries explained

SolaX Moixa Sonnen




                                       How do I choose the right battery size for my house?

The first step is to determine the amount of energy your solar panels produce per day.

To calculate this amount, you could either use a daily average or the amount of energy necessary to meet your needs during the winter peak, when you get the least sunlight. If you’re off-grid, your best bet is probably to use the energy you need to power your home during the winter peak.

If you choose to use your daily average, look over your past energy bills and add up your annual kilowatt-hour total. Divide this number by 365 to determine the number of kilowatt-hours you use per day.

If you’re in an off-grid location and don’t receive a home electric bill, you’ll need to calculate the kilowatt-hour usage of your home the long way.

This means tabulating the total wattage of each of your devices and appliances, then multiplying that number by the number of hours you use it per day. For instance, if you have 10 LED light bulbs, each of which is rated at eight watts, and you usually use each one six hours daily, you’ll need to develop a battery bank capable of sustaining at least 480 watt-hours (10 times eight times six) for lighting per day.

When using this wattage calculation method, create a digital spreadsheet to keep track of all your appliances, their wattage, and the number of hours you use each one.

After figuring out the watt-hour expenditures for everything in your house, add all the totals together to arrive at your home’s daily energy  total.

For instance,

if you have a TV that uses 100 watt-hours, a fan that requires 300 watt-hours, and a computer that uses 400 watt-hours, plus the 480 watt-hours of lighting mentioned above, your home’s total daily energy use would be 1,280 watt-hours (480 + 400 + 100 + 300) per day.

You can use the daily watt-hour total to determine the amount of power your battery bank needs to sustain your home for one day. Just divide your daily watt-hours by the voltage of your solar system.

For instance, if you’re developing a battery bank for the 1,280 watt-hour system described above and your solar system has a voltage of 24, you’d divide 1,280 by 24, yielding a quotient of 53.3 amp-hours. In other words, your battery bank needs at least 53.3 amp-hours of storage to provide power for one day.

You’ll also need to determine how deeply you expect to discharge your batteries. Totally discharging your batteries can shorten their life spans.

The recommended depth of discharge for lead-acid batteries is usually 25 to 50 percent. In other words, manufacturers recommend that you only use 75 to 50 percent of the battery’s total energy. Lithium ion batteries, on the other hand, can be discharged down to around 20 percent of their total storage capacity.

Since discharge rates require you to always leave at least some portion of the battery energy in reserve, you’ll need to upsize your battery bank by an appropriate amount to ensure you have enough usable energy.

For instance, suppose you need 100 amp -hours and your batteries can be discharged to a depth of 20 percent. In this case, you’ll divide 100 amp-hours by 0.8 (80 percent, or 100 percent minus your maximum discharge depth of 20 percent), leaving you with a final tally of 125 amp-hours.

Once you know how much battery energy you need to sustain your appliances and electronics each day, determine the amount of backup power you want. For instance, you could install a battery bank that would provide you with enough energy for one day (equal to your amp-hour total), half a day (by dividing your basic amp-hour total in half), two days (by doubling your basic amp-hour total), and so on.

Just remember: the larger your battery bank, the more expensive it will be, and the more space it will require.

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