Prepare for solar PV and battery storage assessments with 714 practice questions across 19 topics, ten built-in calculators, and a Quick Reference library of 229 cards. PRACTICE THE FULL BANK Work through 19 topics covering shared requirements, solar PV and energy storage. Every question carries an explanation, and you can retry only the ones you got wrong, skipped, or have never attempted. MOCK TESTS Sit mock tests drawn from across every topic, and track your scores over time. CALCULATORS Ten calculators for everyday design and commissioning work, each showing its assumptions and the standard it is based on. QUICK REFERENCE 229 reference cards you can search and bookmark, available offline. FIELD TOOLS Log your work and export it. PDF reports are watermark-free on the full version. FREE VERSION The free version includes 40 questions across the four shared requirements subtopics, four calculators and two Quick Reference sets. Unlocking the full version opens all 19 topics, all 714 questions, every calculator and reference card, unlimited field-tool records, and watermark-free PDF exports. Full access is sold as an auto-renewing subscription. You can cancel at any time in Google Play. This is an independent exam-preparation app and is not affiliated with or endorsed by MCS, the IET or any DNO. www.batterystorageprep.co.uk