Storage guidance & codes. Martin Cotterell
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1 Storage guidance & codes Martin Cotterell NSC 2015 Part of the BRE Trust
2 Battery storage guide NSC project - WIP Target audience: A) End users: Benefits of energy storage systems Financial payback Pros and cons of different system types Implications of o Different system sizes o Different operating regimes. B) System designers & installers: Information to ensure safe and effective energy storage systems are designed, specified and installed.
3 NSC storage guide Four parts 1) System components and configurations 2) System operation 3) Performance analysis (inc control strategies & sizing) 4) Installation and design standards
4 Components & configurations Grid connected system incorporating integrated inverter-charger Inverter / charger No facility for off grid operation Battery GRID Distribution board
5 Components & configurations AC coupled design DC coupled design Battery connected via battery-inverter & regulator on the AC side Battery connected on PV side of inverter Battery kwh Battery kwh Distribution board Generation meter records output after battery losses Generation meter ignores battery losses Distribution board
6 Systems with off grid capability Inverter / charger Grid connected system inc. isolation relay Inverter / charger Allows for off grid operation GRID Battery ESSENTIAL NON-ESSENTIAL GRID Distribution board Battery
7 System operation & performance analysis Load profile PV generation profile
8 PV generation + on site loads no battery Excess power exported to grid
9 PV generation + on site loads + battery Battery time-shift... using PV power out of the solar day Example with a relatively large battery (all surplus energy used to charge battery)
10 Understanding effect of battery size Smaller battery
11 System operation & performance analysis Understanding operation is key for a customer Ensuring system sized to suit application Ensuring system efficiency & battery lifetime Preventing miss-selling
12 Many operating modes Peak lopping (export restriction) Minimising export (opportunity charging & maximising self-consumption) Time shifting using power outside of the solar day Time shifting exporting power later in the day Systems that allow smaller than normal inverters Systems that can provide power during a power cut Systems that can provide off-grid power for dedicated loads (& UPS) Totally different charge / discharge cycles Require very different system specs
13 Information for the customer MCS requirements? Battery nominal capacity Battery lifetime Charge discharge efficiency Mains usage? Effect on FIT income Power cut operation
14 Information for the customer MCS requirements? Battery nominal capacity Battery lifetime Charge discharge efficiency Mains usage? Effect on FIT income Power cut operation Our product has a 500Ahr battery whereas our competitors only has 300Ahr C20 vs C100 rating? 500 x 24V = 12kW 300 x 48V = 14.4kW
15 Information for the customer MCS requirements? Battery nominal capacity Battery lifetime Charge discharge efficiency Mains usage? Effect on FIT income Power cut operation Standard text? This battery has a total capacity of xxxkwh (at the C20 rate). However, to ensure a good battery life, the system is designed to cycle the battery down to no more than xx% discharged this means an effective usable capacity of xxxkwh this equates to a 100W light bulb operating for xxhours
16 Information for the customer MCS requirements? Battery nominal capacity Battery lifetime Charge discharge efficiency Mains usage? Effect on FIT income Power cut operation Some systems use the grid to top-up battery (if insufficient sunshine / for equalisation charges)... >> customer needs to know how much power is used per year Will battery losses reduce FIT income? (system design & location of kwh meter) >> Customer needs to understand reduction
17 Information for the customer MCS requirements? Battery nominal capacity Battery lifetime Charge discharge efficiency Mains usage? Effect on FIT income Power cut operation Customers may reasonably expect the system to work during a power cut >> It may not >> If it does: may not run all loads or for very long
18 Design & installation standards
19
20 2002 First edition of the DTI Guide nd Edition published 2007 MIS3002 published - refers to PV guide 2012 MCS PV Guide issued 2013 IET NSC start work on PV CoP 2014 IET issues CoP for public comment 2015 Working through >350 comments Ready soon! Evolution
21 Scope This Code of Practice sets out the requirements for the design, specification, installation, commissioning, operation and maintenance of grid-connected solar photovoltaic (PV) systems installed in the UK. The scope of this Code of Practice covers: All parts of a grid-connected solar PV system up to, and including, the connection to the AC mains. LV and HV connections and components. All scales of application, from small domestic systems to large-scale PV farms. Building-mounted, building-integrated and ground-mounted systems. Grid-connected systems with battery storage. Systems with an open circuit DC voltage of greater than 30VDC and less than 1,500VDC.
22 IET PV CoP - Key battery sections Battery: main overcurrent protection Battery isolation PV array/string overcurrent protection DC cables and component ratings Battery installation Isolation and switching for off-grid operation
23 IET PV CoP - Key battery sections Battery: main overcurrent protection Battery isolation PV array/string overcurrent protection DC cables and component ratings Battery installation Isolation and switching for off-grid operation NB: many other sections of the IET CoP are also very relevant
24 IET PV CoP - Key battery sections Battery: main overcurrent protection Battery isolation PV array/string overcurrent protection DC cables and component ratings Battery installation Isolation and switching for off-grid operation Various requirements, but key is the location and having an interrupt rating that is higher than the batteries rated short-circuit current
25 IET PV CoP - Key battery sections Battery: main overcurrent protection Battery isolation PV array/string overcurrent protection DC cables and component ratings Battery installation Isolation and switching for off-grid operation Potential for fault currents to flow from the battery into the DC side of the system Fuses OK? Cables & other components OK?
26 IET PV CoP - Key battery sections Battery: main overcurrent protection Battery isolation PV array/string overcurrent protection DC cables and component ratings Battery installation Isolation and switching for off-grid operation Location / access Ventilation Temperature control Terminals protected Containment (corrosive) PPE Labelling
27 IET PV CoP - Key battery sections Battery: main overcurrent protection Battery isolation PV array/string overcurrent protection DC cables and component ratings Battery installation Isolation and switching for off-grid operation G59 Neutral earth bond
28 Related topic export limitation Work in progress For another session!
29 Questions msundog
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