Frequently Asked Questions
Technical FAQ
What is the self-discharge rate of the battery?
Our batteries self-discharge at a rate of 2%-3% per month.
Is the power conversion system (PCS) included?
Yes it is! We have a regular power conversion system (PCS) and hybrid PCS available.
Are you the manufacturer?
What are the specifications of the BESS?
To design a BESS we use a “Specs Form” to collect the info needed for the project/application and then we create the specs sheet for the specific design. Skip the waiting line and fill one out here.
What is the round-trip efficiency of the system?
Recommended depth of discharge?
What is the charge and discharge rate?
We call charge/discharge rate as ‘C rates’. The calculation of ‘C rate’ is ‘charge & discharge power/capacity’.
For example, a 100kWh battery discharge at a power of 100kW, the battery discharge rate is 1C meaning the battery will be fully discharged after one hour.
Our BESS can reach up to 1C charge and discharge rate. Our recommended charge/discharge rate is 1C/0.5C, which is required by the majority of our clients.
Lifecycle description?
For 0.5C/1C discharge/charge rate, our battery cell lifecycle can reach up to 86% Depth of Discharge at 4000 charge/discharge cycles, and 80% at 8000 charge/discharge cycle.
For 1C/1C discharge/charge rate, our battery cell lifecycle can reach up to 80% Depth of Discharge at 4000 charge/discharge cycles.
What is SOC?
State of Charge (SOC) is the available percentage of energy of battery. Take our cellphones as example, the percentage of available power is the SOC.
What EMS system do you recommend?
Do you have a reference for a utility connection?
We’ve designed BESS’s connected with 600V, 3ph or higher mid-voltage system such as 27.6KVA. We can provide transformer if required and some sample SLD (Single Line Diagram).
Installations can be both 1ph and 3ph?
Mostly 3ph, due to the limitation on the inverters – especially for high power rate. It could be used as single phase as well – it’ll just have some waste on output power rate though.
Safety FAQ
What are the tests and protection systems available for the battery pack?
Do you have any fire protection design?
In the fire protection technology, we are conducting a number of research and development, such as the fire and explosion protection design applied in the mining industry, which will be applied to our battery pack design using a pipeline connected safety management method. When the power system detects abnormal heat or voltage abnormality of a battery pack, the pipeline communication control device will separately open the shunt solenoid valve of the battery pack and the flame retardant liquid in the fire extinguisher without disturbing other battery packs. The fire-fighting gas is separately delivered to the battery pack through the shunt pipe of the external pipe, preventing the thermal runaway from spreading to other battery packs, thereby avoiding system fire hazard.
Is the system compliant with NFPA855?
For outdoor system there is no issue for NFPA855 compliance.
The NFPA855 compliance is relevant when there are indoor systems. The issue with the system capacity is it’s limited space – i.e. you can only have 600kWh installed together and to install another 600kWh needs to be 1m away. In these cases, need to contact the local facility to figure out the layout of the system. Not an issue of NFPA compliance when our system has passed the certification.
How is the system monitored for fire?
There will be smoke sensor within the container and temperature sensors within the battery packs and container to check on fire issue. We are also looking at a new technology-based sensor, which could prevent the fire from happening based on detecting and controlling of hydrogen before the cell catches fire in advance.
Remote monitoring system will let the owner receive info about whether system’s caught fire remotely through the fire suppression sensor and temperature sensor. System alarm will also record them. On local control side it will mostly rely on the fire suppression system itself, which will be turned on if anything is detected. We can also add the control logic on if the temperature within battery is too high, then turn on the fire suppression system – the issue will be that the communication won’t be faster than the communication within the fire suppression system itself. Only the temperature sensor is not really a reliable way to define whether there is fire.
Is this a UL listed product?
Does your BESS include a built in BMS?
Yes, our BMS is built in and certified together with battery packs and modules.
How to set system to not discharge higher than specific level?
We can set the up-limit of the charge level through our proprietary BMS.
How long have these batteries been operating in production duty cycles?
During the production, the battery mostly are charged and discharged 8 – 15 cycles based on the battery quality and system consistency.
Are your cabinets water proof?
Our outdoor cabinets meet the requirements of NEMA 3R, which includes the IP55 water proof testing, anti-corrosion testing, and more.
Does your BESS emit any GHG?
No. BESS by itself doesn’t emit any carbon emission, even in case of a fire situation we could choose NOVEC 1230 type of fire extinguisher, which uses enviromentally friendly extinguishing fluid. Beyond, it will help reduce GHG emission if used with other renewable sources.
What statistics do you have on long-term reliability of your cells and failure cases?
Our Battery Management System has passed UL certification and based on the test results the function reliability of our management system is acceptable. For our battery side, we’ve done long-term charging/discharging tests to make sure the performance is up to standards.
Sales FAQ
What is the price of the unit?
It depends on: the Application, kWh, the system specs, financing/leasing/payment terms, and many other variables.
What is the ROI?
It depends on the application and the cost/benefit analysis, we see a lot of cases with unlevered IRR more than 10%-12% especially with high electricity price, good solar or wind condition or high diesel cost etc.
Where is your manufacturing location?
We have multiple locations, modules and packs are manufactured in China, enclosure could be from China and Canada and our systems are assembled in Canada, UK and US.
What are the Leasing solutions?
We offer leasing solutions through our financial partners.
The eligibility and cost depend on the profile of the handling (the lease) company for the leasing partner to do its due diligence.
Basic info to start off with: company’s name, industry in, business description, years in business, financial standing, the annual project(s) volume of leasing, if it’s a one off sale or multiple sales.
For more information on other payment options, click here.
What are the EMS companies you're working with?
We have several partners working for different use cases, such as SNC Lavalin, Siemens and other small brands.
Service & IP FAQ
Do you offer a battery warranty?
We offer a free 2 year warranty. We also have an optional 5- or 10-year extended warranty.
Do you offer service & maintenance?
We offer maintenance and on-site technical and monitoring service. That includes the technical inspection, charge and discharge test, and consumables inspections. We also provide optional 5 and 10 year extension service on good price.
What is your IP type?
We applied US IP, they have two different types, Utility IP and design IP. Our IP is a Utility IP.
What is your IP for?
the “Dual-Equilibrium”™ balancing technology (a hardware and software device to significantly extend the life-cycle of the BESS)
How does Dual-Equilibrium™ Work?
This technology is for the battery cell equilibrium. The State of Charge (SOC) unbalance in a battery pack could significantly influence the battery pack lifetime. Therefore, the balancing or equilibrium is required to ensure the battery lifetime. Currently the equilibrium technology widely used is passive equilibrium method, which is stable but low efficiency. Our technology combines active and passsive equilibrium method which can bring us a higher efficiency battery equilibrium method and a longer battery life.
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