The Professional bundle
All five courses in one purchase, at one price. The same lectures, the same updates and the same lifetime access as buying them one at a time.
Bought before 3:00 PM PDT (10:00 PM UTC) on October 20, 2026: Full refund on the whole bundle any time until October 20, 2026. Bought from then on: Full refund on the whole bundle within 30 days of purchase, provided less than half of the bundle’s content has been completed. Terms
Company paying? We can invoice your employer — email sergey@bess.courses with the course and your company name.
Student or early-career engineer? The Complete Guide is free for you, and every specialist course and the bundle are 50% off. The student discount does not combine with any other discount, early bird included. How to claim it
- Grid-Scale Battery Energy Storage (BESS): Complete Guide Available now
- How a Battery Gets Paid Available now
- BESS Engineering Foundations Pre-order — lands by the end of October 2026
- BESS Warranties, LTSA & Performance Testing Pre-order — lands by the end of November 2026
- Fire Safety for Battery Energy Storage Systems Pre-order — lands by the end of December 2026
Grid-Scale BESS: The Complete Guide is the foundation course; the other four go deep on one area each. Each also sells separately — the specialists right here, the Complete Guide on Udemy today — and the bundle exists because most people working on a real project end up wanting more than one.
What you save
What the bundle costs against buying the five courses one at a time, both at today's prices and at their full prices. Amounts are resolved for your own region.
One of the five is the Complete Guide the same instructor sells on Udemy; the other four are separate specialist courses. What differs
Secure checkout by Stripe — card, Apple Pay and Google Pay. The lines under each price say whether tax is included and, where we can estimate it, about what Stripe will show in your own currency.
The terms
One purchase, five enrolments
Buying the bundle enrols you in all five courses at once — there is no code to redeem and nothing to claim course by course. Your access link arrives by email within minutes of payment; the course streams in your browser, in your classroom at training.bess.courses. Each of the five appears there, and if one ever fails to appear the others are unaffected.
The email you enter at checkout receives the access link and becomes the student account — buying for someone else? Enter their email at checkout. For multiple seats, write to sergey@bess.courses.
When each course arrives
Released courses are yours immediately. The courses still in production each open their course space at purchase, and full content lands by the end of October 2026 (BESS Engineering Foundations), November 2026 (BESS Warranties, LTSA & Performance Testing) and December 2026 (Fire Safety for BESS).
Refunds
The bundle has its own refund term, set by when you bought it. It replaces the per-course refund-until-release promise for courses bought as the bundle.
- Bought before 3:00 PM PDT (10:00 PM UTC) on October 20, 2026: Full refund on the whole bundle any time until October 20, 2026.
- Bought from then on: Full refund on the whole bundle within 30 days of purchase, provided less than half of the bundle’s content has been completed.
Either way, asking for it takes one email. How early bird works.
The trade-off
BESS Engineering Foundations, Fire Safety for BESS and BESS Warranties, LTSA & Performance Testing may land after your refund window has closed. In the bundle, a refund covers the whole bundle and only while that window is open; bought separately, each stays refundable until its own release and for 7 days after — if that term matters more to you than the bundle price, buy those courses individually.
Certificates
BESS.courses issues a certificate of completion with its own ID and QR code — anyone can check it at bess.courses/verify at any time. In this bundle that covers Grid-Scale Battery Energy Storage (BESS): Complete Guide and How a Battery Gets Paid. It is a completion record, not an accredited professional certification: as of 2026 there is no accredited BESS-engineer certification to hold. What the credentials actually are. The other 3 courses state their certificate status on their own course pages.