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GoodWe Domestic DC Storage System with Pylon
The GoodWe BP series DC energy-
The Pylon batteries are modular. You can fit one and then add another at a later date if the energy needs on site change.
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-
If you choose to use your daily average, look over your past energy bills and add up your annual kilowatt-
If you’re in an off-
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-
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-
if you have a TV that uses 100 watt-
You can use the daily watt-
For instance, if you’re developing a battery bank for the 1,280 watt-
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-
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 -
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-
Just remember: the larger your battery bank, the more expensive it will be, and the more space it will require.
Over the last year I have answered numerous phone calls
from existing customers who had been cold called by solar companies trying to sell them ad-
Which quite honestly most are a waste of money, but lately
the phone calls have been asking about compliance IEC 62446
testing, and with this being a safety issue I spoke to several
other installers, which some say that they follow it, others don't.
The essential need for all installers of PV systems in the UK
is to satisfy MCS requirements (for systems up to 50kW), as detailed in the DTI’s guide Photovoltaics in Buildings, this is fundamentally aligned to the BS EN 62446:2009 standard for
grid connected PV systems.
In short, this document sets out the minimum requirements for
PV system documentation, commissioning tests, and inspection
to ensure the safety and quality of system installation.
The standard includes specific measures to ensure that:
been wired up correctly
The standard describes various electrical tests to ensure that
the solar installation fully complies with MCS requirements.
While many of the more reputable and discerning solar PV installers recognise the importance of testing to the standard,
it is of serious concern that some installers are failing to perform the required tests, or at best only partly fulfilling this obligation.
Clearly where testing is not being carried out in accordance
with BS EN 62446, the system will be in breach of MCS requirements and should not be eligible for feed in tariffs
or be connected to the grid.
This has potentially serious implications for the quality and
safety of the solar PV installations in question.
For example, it was recently reported that a house fire in
Kent was caused by a fault in a rooftop solar PV installation.
This mirrors the situation in the USA, France and Australia where property fires and surveys of solar PV installations
have raised specific concerns over incorrectly installed PV systems and their role as both a fire hazard and as a cause
of increased risk of electrocution.
All involved in the solar PV industry need to take responsibility
for the correct and proper installation of solar PV systems and
the recent MCS/Gemserv consultation on the competency of
solar PV installers seeks to address such concerns.
However, the solution lies in ensuring compliance with all relevant standards, including the solar PV testing and documentation requirements of BS EN62446.
Only when this happens can the certification body be given the evidence that the work has been performed correctly and
the customer given the assurance that absolute best practice
has been followed in the installation and periodical testing of
their PV system.
It is now several years since we installed your system and
testing is now required