The availability of Tesla Powerwall’s from recognised PV wholesale distributors has become an issue for many installers in the UK, but the release of an alternative high voltage battery from leading rival LG Chem may just be the answer.
As well as being part of one of the most well-known global brands, LG Chem is leading the world lithium-ion battery market, being ranked global no.1 in both the automotive and ESS battery markets.
LG Chem may not have managed to compete with Tesla’s media coverage, but their new high voltage batteries easily compete on technical specifications and looks. The batteries have even overtaken Tesla sales in the Australian on-grid storage market with estimates showing that LG Chem were responsible for almost half of all their storage installations to date (over 1000 and counting!), and the batteries look set to have a huge impact on the UK market too.
The LG Chem RESU (Residential Energy Storage Unit) will be available from BayWa r.e. Solar Systems from the beginning of May 2017. We will be stocking the RESU7H and RESU10H high voltage batteries that have a high depth of discharge (90-95%), IP55 indoor and outdoor installation, and a 10 year warranty.
Ok, so why the 400V version?
It’s all about the “max power” figures, the amount of continuous power they can supply when new. For on-grid applications higher power improves the economics of battery storage as households will need to draw on grid power less often during the day when electricity consumption exceeds rooftop solar production.
Similarly to the Tesla Powerwall, the LG Chem RESU products are pretty heavy and sizeable, but they also pack a punch with max power for the RESU7H and RESU 10H being 3.5kW and 5kW respectively.
Both the RESU7H and the RESU10H can be used in on and off-grid applications (subject the correct equipment and regulations being adhered to). Like most new battery systems, apart from keeping them reasonably clean, RESU require no maintenance. LG Chem has also claimed that their method of producing the batteries makes them the safest lithium-ion on the market. Find out more by watching their production video.
You can also read more about the technical specifications of both products here: http://www.baywa-re-solarsystems.co.uk/Battery-Storage/manufacturer/LG-Chem
Charging / discharging the battery
This is where things get interesting. How do the batteries get charged and discharged?
There is one version of the RESU7H which serves both the StorEdge and SMA Sunny Storage solutions. The RESU10H will only be SolarEdge compatible.
Both SolarEdge and SMA use the same battery pack set up as for the Tesla unit with SolarEdge requiring the additional StorEdge Interface, Meter and CT Clamps (which are DC connected), and SMA requiring the SunnyBoy Storage 2.5, Meter and Split-core current transformer.
No installer certification process
Perhaps the best thing about the LG Chem batteries in comparison to the Tesla Powerwall units is that installers do not need to be certified to install them. The ease of install of the battery system means that PV installers do not need to apply for and complete a lengthy registration and training process, they can simply purchase the products directly from their online account and start installing straight away!
To find out more about the LG Chem RESU batteries, or to place an order, please log in to your online account.