Retrofit Balcony Solar Storage: Does Adding a Battery to Your Existing System Pay Off?
David Reinhardt
Your comparison for power banks, portable power stations and mobile solar
Guides 17
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David Reinhardt
Solar Power Bank Test: Real Charging or Just Decoration?
Jonas Keller
Glass-Glass or Glass-Backsheet: Which Solar Panel Is Actually Worth It for Balcony Solar
David Reinhardt
Balcony Solar as a Tenant in Germany: What the Section 554 BGB Claim Has Actually Meant Since 2024
Jonas Keller
News 14
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IFA Berlin 2026 Exhibitors: Power Stations and Balcony Solar
Three weeks out from the show, the list of IFA Berlin 2026 exhibitors in the portable power category has stopped being guesswork. Anker Solix, EcoFlow, Jackery and Bluetti each have their own profile in the official exhibitor directory, hall and booth number included. The show runs 4 to 8...
David Reinhardt
Germany's Nationwide Warning Day 2026: Why Emergency Experts Now Point to a Power Station
The 2020 debut was officially declared a failure by the Federal Interior Ministry. Warning apps buckled, plenty of sirens stayed silent or fired late. Nationwide Warning Day 2026 arrives on 10 September with a better scorecard: according to the BBK survey on the 2025 Warntag published 24.04.2026,...
Sophie Ahrend
Tips 8
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Balcony Solar Orientation: Why East-West Often Beats South
South is the best balcony solar orientation, you read that everywhere. For your power bill it often isn't true. Optimise your balcony solar orientation for maximum yield alone, and on a system capped at 800 W you hand money back to the midday sun.
Jonas Keller
Power Banks in Winter: Why Cold Kills Your Capacity – and What Actually Helps
The moment is always the same. Ski lift, freezing platform, second hour of a dog walk below zero: your phone shows 20 percent, you plug in the power bank, and instead of the two full charges it normally manages, you get half of one. Or nothing at all. The obvious conclusion is that the thing has...
David Reinhardt
Stories 1
One post in this sectionAll Posts 40
Guides
Retrofit Balcony Solar Storage: Does Adding a Battery to Your Existing System Pay Off?
You already run a balcony solar system, the panels are up, the inverter is feeding in, and now the battery is tempting you. Retrofitting balcony solar storage is usually the easy part, technically speaking. Whether it pays for itself is the far more awkward question. So we answer that one first,...
David Reinhardt
Guides
Solar Power Bank Test: Real Charging or Just Decoration?
A solar power bank test almost always ends the same way: pretty cell, sobering numbers. The built-in solar cell isn't fake. Real silicon, real charging electronics. The physics just refuse to cooperate, and that's exactly what those product shots in the sun never tell you.
Jonas Keller
Tips
Balcony Solar Orientation: Why East-West Often Beats South
South is the best balcony solar orientation, you read that everywhere. For your power bill it often isn't true. Optimise your balcony solar orientation for maximum yield alone, and on a system capped at 800 W you hand money back to the midday sun.
Jonas Keller
Guides
Glass-Glass or Glass-Backsheet: Which Solar Panel Is Actually Worth It for Balcony Solar
The one hard difference between glass-glass and glass-backsheet that you can actually look up in a datasheet is the product warranty: Trina gives its glass-glass Vertex S+ TSM-NEG9RC.27 25 years product and 30 years power warranty, while the glass-backsheet Vertex S TSM-DE09R.05 gets 12 years...
David Reinhardt
Tips
Power Banks in Winter: Why Cold Kills Your Capacity – and What Actually Helps
The moment is always the same. Ski lift, freezing platform, second hour of a dog walk below zero: your phone shows 20 percent, you plug in the power bank, and instead of the two full charges it normally manages, you get half of one. Or nothing at all. The obvious conclusion is that the thing has...
David Reinhardt
Guides
Balcony Solar as a Tenant in Germany: What the Section 554 BGB Claim Has Actually Meant Since 2024
For anyone renting in Germany, the first question about a balcony solar system is rarely technical. It is whether the landlord can simply say no. Until October 2024 the honest answer was usually yes — permission was needed, and a refusal did not have to be particularly well argued.
Jonas Keller
Tips
Power Bank in a Hot Car: What Summer Heat in the Glovebox Actually Does to the Battery
The power bank has been in the glovebox since May. It bothers nobody there, it is available in an emergency, and it is, after all, just a piece of electronics in a closed compartment. That reasoning falls apart in high summer, and not because the battery bursts into flames on a Tuesday afternoon,...
Jonas Keller
Guides
Balcony Solar and German Home Contents Insurance: Reporting, Theft and What Storm Cover Really Says
A balcony solar system hangs outdoors, weighs about twenty kilos and costs roughly what a decent bicycle costs. That makes it the one household purchase that can be contents, building fixture and a hazard to the neighbours all at once — depending on who you ask and which contract you signed.
Jonas Keller
Guides
0% VAT on Balcony Solar Storage in Germany: Who Benefits and What It Actually Saves
Buy a battery for a German balcony solar system in 2026 and the invoice will almost certainly show a zero where the VAT line should be. That is not a retailer discount or a limited promotion. It is the zero rate under § 12 (3) of the German VAT Act (Umsatzsteuergesetz, UStG), in force since 1...
David Reinhardt
From a Battery Fire to a Rule: How One 2025 Incident Changed Power Bank Regulations on Aircraft
Fourteen months separate a burning overhead bin in South Korea from the sentence "no more than two power banks may be carried per person" in an ICAO document. In between, a national aviation ministry, Europe's EASA, America's FAA, China's CAAC and a series of airlines each reacted in turn, with...
Jonas Keller
Tips
How Long Does a Power Bank Really Last? Charge Cycles, Aging and When Replacing Pays Off
A power bank rarely dies on a particular day. It gets quietly weaker over months, and at some point it no longer carries your phone through to the evening — without a single warning light having come on beforehand. That is exactly why the lifespan question is so unsatisfying to answer: there is...
David Reinhardt
Tips
Does the EU USB-C Mandate Apply to Power Banks? What the Directive Actually Says
Since the end of 2024, virtually every new phone sold in the EU has a USB-C socket, so most buyers assume the same rule covers the power bank in their drawer. Then a freshly ordered model arrives that still charges over Micro-USB — perfectly legal, and a neat demonstration of how narrowly the EU...
Sophie Ahrend
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