bosch ebike charger wattage

Moesz zosta jego Najlepszym Przyjacielem albo Najwikszym Wrogiem! Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total. Done. charger bosch bike battery 240v haibike bulls fits etc standard Wed be spraining our wrists patting you on the back so hard for giving us simple 100W USB-C charging. Add a DC-DC converter to bump up from 20V to 54.6V (or whatever your battery voltage is). Andrzej Maka Wiedza na temat wolnoci finansowej sprowadzona do prostej formuy 3 krokw. This page may contain affiliate links, please check out our disclosure policy here. przeczytaj wicej Dominika Kukua Mylisz o zaoeniu sklepu internetowego? Ten ebook w doskonay sposb odpowie Ci na te pytania, a take da Ci odpowied na pytania: Aleksander Sowa Why is Geothermal Energy not Always a Renewable Energy Source? change quantities, enter codes, or checkout. Czy wiesz, e moesz napisa ksik i jeszcze na tym zarobi? Now you must connect your charger to the inverter outlet to determine whether it is receiving power. Electric bike battery USB-C charging could and should be closer than you think. Dlaczego powstaj nowe firmy i czy na pewno masz waciwe powody, by zaoy wasn. The advantage of a high voltage is that it has more power, allowing your electric bike to go faster for a longer time. Bd aktorem swojego ycia i jego reyserem. The first one that I tried caused the battery charger to overheat (too hot to touch). We have Bosch powered bikes, I use a 1000 watt pure sine wave. ( 2 ), 5 of 5 stars average Please read more, your price $135.50 JavaScript is disabled. A czy Ty potrafisz wzi odpowiedzialno za SWOJE ycie? This is the part number or identifier for this item from the manufacturer. But dont fret! Czy cel jest zbyt ambitny, trudny do osignicia? Electric bike makers specify these as they provide a tremendous cost to power ratio for their products. przeczytaj wicej Anna Opala How Do I Calculate How Many Solar Panels I Need? FTC: We use income earning auto affiliate links. Jeli posiadasz wiedz, ktrej nie maj inni, jeli jeste przekonany, e wiedza, ktr posiadasz, pomogaby innym ludziom w szybszym rozwju, jeli osigne w yciu znaczcy sukces, ktrym chciaby si podzieli, to moesz tego uczy innych, majc z tego wielk satysfakcj, a nawet pienidze. *. 72V batteries are also considerably more expensive than 48V batteries. Video How to charge your ebike with solar panels. We si w gar, zacznij dziaa i odkryj proste prawa odpowiedzialne za Twj yciowy sukces! And while, were at it, USB-C PD discharging, effectively turning the battery into a backup power supply for your electronics, could easily be added. przeczytaj wicej Wanda Szulc I am using a 310 watt solar panel and dual 6 volt AGM batteries. But by and large, theyre mostly all pre-built batteries that are chosen from an OEMs catalog. przeczytaj wicej ukasz Chojnacki ( 1 ), 5 of 5 stars Well thanks a lot, e-bike companies, because youve brought us right back to the dark ages with electric bike battery chargers. Solar Panel To Car Battery. Problem z utrzymaniem odpowiedniej wagi ciaa maj kobiety i mczyni, ludzie modzi i starzy. Wicej i ciej si uczy? In this case the ebike would charge in exactly the same times as if you plugged it into the mains. przeczytaj wicej Kamila Nowak Is charging eBike with solar charger possible?

W kocu ten poradnik nie miaby adnej wartoci, gdyby nie fakt, e najpierw pozwoli Ci dokadnie okreli, czego pragniesz i jaki cel da Ci spenienie i szczcie. Some orders are inelligible for delivery discounts. So what do we need? Aspirin Express icroctive, success story NUTRAMINS. Autorka tego ebooka ma kilka znakomitych rad, jak mona zacz lubi poniedziaki. I don't see why that wouldn't work if that's all the AC you'll need in your van. I was considering upgrading my two 100Ah lead batteries to LiFe anyway, so that confirms I would be heading in the right direction. It prevents you from becoming stranded away from home, and you will not be forced to pedal back home because you have run out of power. My preferred solar charging setup for an ebike using standard charger. But last year the USB-PD Revision 3.1 increased the power potential of the protocol to a whopping 240 watts! Nie masz odpowiednich umiejtnoci i wiedzy? Czy zdarzyo Ci si kiedy w relacji z mczyzn, e wydawa Ci si niedostpny? Ale niestety, zwizany jest z tym wydatek niemaych pienidzmi. Can A 100 Watt Solar Panel Run An Air Conditioner? To, co nas spotyka w yciu, jest w duej mierze uzalenione od nas samych. I recommend using the mains charger that you already have and feed that with solar. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Zamiast na rozwizaniach, skupiamy si na samej przeszkodzie. Zamiast moliwoci i szans, szukamy problemw. przeczytaj wicej Barbara Gawryluk Which is about the same price as the Victron inverter. There will be times when you will be stranded in the middle of nowhere, which is not convenient for most chargers; however, this is not a problem for solar chargers. Moe i Ty do nich naleysz, a moe tylko chcesz zrzuci dosownie kilka kilogramw, eby czu si lepiej. Not a lot to add except the pure sine wave inverters do seem to vary in how pure they actually are. przeczytaj wicej Emilia Jedamska Another factor to consider when designing or operating a high-capacity electric bicycle is the possibility of being shocked.

Czego dowiesz si z tego ebooka? I very much enjoyed reading the posts on touring in Northern Scotland. Electric bike batteries can be found in various voltages, namely 48V, 36V, and 24V.

przeczytaj wicej Artur Samojluk przeczytaj wicej Witold Wjtowicz This indicates that the solar panel has been effective in charging the batteries. Connect it to a USB-C PD port. przeczytaj wicej Sawomir niegocki Co wzi pod uwag przy podejmowaniu ostatecznej decyzji. How To Road Trip Like A Pro With Hipcamp And RV LI Lake Superior Campsites With Great Reviews, Escape Systems | Water, Waste, Charging & Propane, https://www.escapeforum.org/forums/f8ape-12918.html. Is charging eBike with solar charger possible? Trailer: 2014 Escape 21. Item Specifications Designed for ebike: Yes Bosch Drive Unit Compatibility: Active Line Bosch Generation Compatibility: BDU2XX read more, Bosch charger parts. How Much Solar Would It Take to Power a House? You need proper wiring rated for the full 700W the inverter can do on overload. To make your own charger, addition to the panels, you will need a charge controller, which boosts the amount of output power obtained from the solar array. Gdzie zarejestrowa firm i jak dokona wszystkich formalnoci. The same USB-C charger that we already plug into our laptops could conceivably charge our electric bikes and electric scooters. przeczytaj wicej Jolanta Gajda compact ebikes This is called irradiance. Tow vehicle: 2012 Toyota Tundra Crewmax Platunum. See offer details for disqualifying products and destinations. Theres already a convenient solution here, and its called USB-C. Electric bike battery USB-C charging needs to become a thing. Good luck. Zasady sukcesu nie istniej, to znaczy - istniej, ale jest ich tyle, ilu ludzi na wiecie. If its intended to charge the ebike at night, then add a solar battery charger and a 50Ah lithium phosphate battery. Jednak istnieje wiedza, dziki ktrej kady moe utrzyma, a co wicej, rozwija sj biznes. We manage to charge our 2 500wh batteries simultaneously, off grid or whilst driving. Dobrze trafie! What Size Solar Panel To Charge 100Ah Battery? Also takes 7 hours to charge. Unfortunately, you cannot simply buy solar panels, attach them to the battery of your eBike, and sit around waiting for your battery to charge. Pewnie pomylisz "Jak to? , Sabizabulin: Covid-19, 17,5 . I have 2 x 84Ah Li-ion Leisure batteries in the campervan, Also the price of the Bosch 12v charger is 149. Jakie s inne moliwoci? (2021, February 11). Co wic trzeba zrobi, aby nauka jzyka angielskiego bya skuteczna? That suggests considerable headroom compared to the labelling on the charger itself which must be some weird worst case scenario. Przede wszystkim trzeba si we waciwy sposb zabra do jego nauki. The answer to this madness is simple though: the common, convenient, and powerful USB-C connector. But there are other issues here. jaka jest jedna, najwaniejsza rzecz w yciu zawodowym, ktra wpywa bezporednio na Twj sukces lub porak. A number for the inbound PV voltage will appear on your charge controllers screen, signaling that the panel has been successfully installed and connected.

Does Bosch make a charger with DC input? Theres a bit of work here. Are Lithium Batteries Better Than Lead-Acid? And after the pandemic, big e-bike companies have a lot of it laying around right now. Czy wiesz, jak moesz podnie jako swojego ycia? Inverter and Solar Charge Controller to the Battery, Solar power- E-bike charging: The possibilities, How to convert your ebike to a solar ebike. On the upper right of the forum main page you'll see a drop-down labeled spaces. You would need at least 3 of these connected in series to produce enough volts to charge a 36 volt ebike battery, for example. Once Covid-19 is over I want to take a couple of months up there in the Spring. The e-bike companies havent given us USB-C charging because most of them dont design or build their own batteries. A cheaper and smaller 12 375 or older style and again cheaper 12 350 will suffice. It get complicated. Czy robi wszystko samodzielnie, czy zleca innym. The 12V charger made by Bosch is long since discontinued. Copyright 2022 by Diy Solar Shack | Speed Optimized by WP Speed Fixer, This page may contain affiliate links, please check out our disclosure policy. Jestem przekonany, e moesz zdoby ca wiedz potrzebn Ci do spenienia swoich marze i to bez cigej harwy, nieprzespanych nocy, a tylko dziki nauczeniu si sposobw szybkiego czytania. How Long Will A 200Ah Battery Last? przeczytaj wicej Marcin Matuszewski An X-Prize? Jakimkolwiek. Dlaczego tak si dzieje? A ebook "Jak ruszy z miejsca?"

It could even do so decently fast. More volts equal greater power. Connect the Inverter and Solar Charge Controller to the Battery. Czy kady moe by wielki? : Wallace D. Wattles yj lepiej. Jak sprzeda po raz pierwszy i co robi, by na tym nie skoczy. You need to weatherproof the connector. 2A Compact Charger is around 40% smaller and will fit in most saddle bags read more, your price $93.50 The first thing to know about electric bike batteries is that they are described in terms of amp-hours and volts. But its a pretty evolving list these days. Najwaniejsze jest to, czy wiedza, ktr przekazujesz, jest przydatna dla innych, czy masz pasj i czy rzeczywicie pomagasz ludziom w ich rozwoju osobistym. Consider this me establishing the Micah USB-C E-Bike Charging X Prize. przeczytaj wicej Andrzej Burowiecki Does Higher Ah Equal More Power? The average number of sun hours in the United States is 4. Whatever it takes. There are at least five or six common connectors across the industry, then more than a dozen less common options. Greece Race for the Cure ! Depending on what you mean by 12V supply, if its a cigarette lighter plug for instance, it blows the fuse at 10A usually. Teraz masz okazj przeczyta po polsku jego ksik, w ktrej przekazuje on PONADCZASOWE ZASADY ZDOBYWANIA PIENIDZY. Co decyduje o sukcesie? przeczytaj wicej Witold Wrotek And when youre in a group of people these days, at least one of them is bound to have a USB-C charger. Ale istniej sposoby na problemy. Dowiedz si jak opanowa do perfekcji sztuk wyszukiwania OKAZJI na rynku nieruchomoci i w szybkim czasie by wacicielem nie jednej a wielu nieruchomoci, ktre bd "spaca si same". Thats as powerful as pretty much any e-bike charger youll find today, and its more than enough to make me and the rest of the electric bike community happy. Z tego ebooka dowiesz si m.in. 1. As a result, for a 48V eBike battery, you would require a charger with at least two solar panels capable of producing at least 200W. Dopiero zaczynasz si uczy i zaley Ci na tym, aby nie traci czasu i si na nieskuteczn nauk. Moesz szuka elementw o tym decydujcych, ale najwaniejszym jestODPOWIEDZIALNO. ( 5 ), 5 of 5 stars average Subscribers do not see these advertisements. Theres a simple reason they havent done this yet. The most important feature is that many eBike chargers can charge a bike at the same speed as a standard power socket. A moe porzuci marzenia o sukcesie, bo nie dajesz sobie rady i nie masz odpowiedniej wiedzy? How Much Power Does a 100-watt Solar Panel Produce? Zakadaj je ludzie ambitni i zdecydowani osign sukces, jednak smutna statystyka pokazuje, e wikszo nowych firm plajtuje ju po pierwszym roku dziaalnoci. Jak zachowa spokj w czasie sprawdzianw i egzaminw. I don't think it's as simple as providing the right voltage. Amazingly it survived. przeczytaj wicej Piotr Mart The higher the number of amp-hours, the greater the distance you can travel on your battery. Solar power- E-bike charging: The possibilities. This means putting together a solar charge kit comprising: If you want to charge at night, then add a solar battery charger and a 50Ah lithium phosphate battery. RVers Share Their Best Tips On This Cheap RV Livin What Is A DC To DC Charger And Why You Need One, Honey Bear By the Sea RV Resort and Campground. Geothermal Sustainability, Cost of Geothermal Energy Compared to Fossil Fuels, How Is Geothermal Energy Harnessed? Miaa moe wraenie jakby nie chcia dzieli si z Tob swoimi troskami, cho wiedziaa, e co go trapi? Moesz osign i dokona tego wszystkiego, o czym od zawsze marzysz. Why Is Geothermal Energy Not Used More Often?

( 2 reviews ), 5 of 5 read more. A moe to jeszcze co innego? How many solar watts does it take to charge an ebike? Do you have a 110 inverter in your Tundra? przeczytaj wicej Marcin Marczak Przecie to niemoliwe!

I kady musi je sam dla siebie napisa. Can you charge ebike batteries with a solar panel? Nie musisz by wybitnym ekspertem. They designed most of the electronics youre using every day. This website is not affiliated with or endorsed by Escape Trailer Industries or any of its affiliates. I didnt think they made the 12 volt charger any more. Or a video of me riding your e-bike down the road in a pink tutu? Therefore, you can expect a higher wattage during summer and reduced wattage in winter. Give me a bidirectional USB-C port on my battery so I can charge my laptop or any other device from it. view your cart, Contact Modern Bike via email, telephone, or showroom visit.learn more, You may check the order status of a recent purchase to learn if it has been delayed, when it may ship, or if it has already been shipped.check order status. But, even more importantly, when you acquire the right solar panels, the question is whether the charger will charge your eBikes battery as fast as power outlets do. Brak Ci poczucia komfortu w jzyku angielskim, a zamiast tego czujesz si zupenie jak gdyby Twoja nauka jzyka musiaa zacz si od pocztku. jest drogowskazem na drodze do lepszego ycia. It may not display this or other websites correctly. And its not even that hard. Solar Panels Florida, All About Solar Panels : Solar Panels Questions : Solar Panels FAQ. Boom, youve just made a portable power station out of your e-bike battery! Solar Panel Wattage * Peak Sun Hours = Energy Generated. But Im not going to carry that bulky fast charger around with me and thats the whole point.

, 210 2829552. Potrzeba Ci jeszcze wiele wiedzy, aby speni swoje marzenia, a tymczasem nie masz kiedy nawet przeczyta jednej ksiki w miesicu? Jak przezwyciy lenistwo i zmotywowa si do nauki. What Is The Biggest Problem With Solar Energy? Czy wiesz, jak skutecznie si uczy? The batteries are expensive, too, so you don't want to muck them up. Jak wybra odpowiedni dla Ciebie profil dziaalnoci i jak przygotowa si do startu. Ladegert parallel zum victron mppt 250/100 mglich? Seriously, Ill help you out. Obtaining 100 percent power output from a solar panel determined by the STC is a long shot in the physical world it hardly ever happens! Can You Run a Hot Tub On Solar Power? Niech kady egazmin stanie si dla Ciebie buk z masem Kadego roku w Polsce powstaj tysice nowych maych firm. Bosch battery chargers are available in standard and compact. Some of the add-ons on this site are powered by. Seems the safe way to go. Nie ma zasad sukcesu!! If so, it might be more efficient than converting battery to AC for the Bosch charger. Twoja droga do realizacji marze i celw wcale nie musi by taka trudna. f.daily, , , , , , , Skyserv , , , . What Do You Need to Charge an E-bike With Solar Panels? Suppose the power output of an electric bicycle goes above the acceptable 750 Watts. Is it OK to leave a solar panel disconnected? Sta si doskonaym kochankiem, znajd punkt G i dowiedz si jak doprowadzi kobiet do wielokrotnego orgazmu. Maz problemy z nauk jzyka angielskiego? Again, including a fuse between the two is the safest course of action in this situation. W ebooku tym znajdziesz a 33 unikalne pomysy na prezent. View your cart to change product quantities, apply deal codes, or checkout. Jest to pierwsza ksika opisujca naukowo potwierdzone sposoby, jak osign sukces w swoim yciu. przeczytaj wicej Kornelia Przedworska For example you might ask if any of the Orion DC-DC chargers could be modified for the Bosch battery pack. But this is all pretty darn simple stuff.

Solar Charger, Can I Charge Car Battery With Solar Panel? Jak spenia si w swojej pasji i jednoczenie pomaga innym ludziom? przeczytaj wicej Marek Zabiciel Tow: Toyota Tacoma V6, 4X4, manual. Location: Lanesboro, MN, between Whalan and Fountain, Minnesota. Wszystkie te pomysy to nie tylko same instrukcje, jaki prezent kupi. I recently went through this process. However, this is the notional amount of power it can produce in Standard Test Conditions, also known as STC. Pierwszy praktyczny poradnik pokazujcy w KONKRETNY sposb JAK zmieni swoje ycie To ensure that your solar panel is charging, place it in the sun and check the PV voltage on the voltage regulator. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'diysolarshack_com-leader-2','ezslot_16',127,'0','0'])};if(typeof __ez_fad_position!='undefined'){__ez_fad_position('div-gpt-ad-diysolarshack_com-leader-2-0')};The problem is the battery voltage, which as we know is between 24 volts to 48 volt normally. Given that most e-bikes are equipped with a capacity of 48V, how many solar panels would be required to charge this battery fully? Specifically USB-PD, or power delivery. Your Shopping Cart contains 0 products. Uses Of Geothermal Energy Give Five Direct Uses of Geothermal Energy.

Can you charge an electric bike with solar panels? Im not even saying USB-C needs to be the only charging option. How to convert your ebike to a solar ebike. Take your e-bike battery. Your skin can protect you from electric shocks up to a voltage in the range of 40V 45V. That will allow you add your original post to a specific space. Jak obliczy, czy sta Ci na zaoenie firmy, ktr chcesz stworzy. The amount of energy you can obtain from this module is dependent on your geographic location and weather conditions. S to osobne poradniki, jak stworzy wyjtkowy prezent oraz jak wrczy go w niezapomniany sposb i dziki temu spotgowa wraenie, jakie wywrze on na obdarowanej osobie. Czy wierzysz, e Twoje marzenia si speni i zrealizujesz swoje cele, czy moe tylko bujasz w obokach nie bdc przekonanym, e to rzeczywicie si stanie?

Best Battery To Run A Fridge. A przecie kad przeszkod na naszej drodze moemy obej bokiem, gr lub przelizgn si pod ni, moemy j wykorzysta jako schodek, odskoczni w gr! The easiest way to charge an ebike with solar panels is to connect between 100 to 200 watts solar panels to an inverter and use that to power your existing ebike charger. Use the comment-feature to reply to an answer; rather than entering a new answer. Jak pokona drog od marze do ich realizacji? Many e-bike batteries already have a USB-A port on them for charging your phone. The chargers are very expensive and I think that's because they include a lot of electronics to manage the battery. We charge our 500 watt Bosch batteries and/or 21 ah Shark batteries in the truck when driving down the road. Obowizki, praca zabieraj Ci zbyt duo czasu i nie starcza Ci go na samodoskonalenie? You can send Micah tips at Micah@electrek.co, or find him on Twitter, Instagram, or TikTok. with a Bosch Battery Charger 36-4/230 . Watch out, Jackery, the e-bike industry is coming for you! Until a year or two ago, USB-C could handle 100W. Jakie s strategie nauki i ktre dziaaj w Twoim przypadku. 12v Battery Charging. przeczytaj wicej Link Market - Free Link Exchange, Link Swap and Link Trade Directory, Katalog stron i promocji firm - Marka Twain'a. According to a recent study, choosing an electric bike as your primary transportation mode and ditching car transportation will go a long way toward lowering the carbon footprint left in the environment. , : site . It is a challenge for it to keep the dual six batteries charged for this process.

And using the wrong charger with the wrong voltage significantly raises the stakes of having a very, very bad day should the Battery Management System (BMS) ever fail. Even the old 100W protocol would be more than enough for us! przeczytaj wicej Przemysaw Pufal Zapominasz swek, ktre jednym uchem wpadaj, a drugim wypadaj. To jest w Tobie. W tym ebooku dzieli si swoim dowiadczeniem i wiedz, dziki ktrym: Elbieta Kalinowska As a result, with a 100 watts solar panel, you can generate approximately 400 watt/hoursof electricity every day on average. Not sure how one gets moved but suspect you'll need the help of a forum moderator. How long to charge an ebike battery with solar? Czy zarzdzenie finansami osobistymi moe by proste? In that case, the bike will be categorized as a scooter which usually requires insurance, registration, and a license plate. When I first posted , it asked for Tags, & something else, I didnt know what to put, so I just clicked on what was offered. Go play Xbox or something. Dowiesz si, jak by szczliwym czowiekiem. It isnt enough to simply know the battery voltage. If youve owned an electric bike, e-scooter, or other personal mobility device (and especially if youve owned more than one), you know they all have a charger that pretty much fits nothing else you own. Electric bike batteries usually are available in four voltages: 48V, 36V, and 24V. Sure, theres been some slight standardization with the 5.5 x 2.1mm DC barrel connector finding its way onto a plurality of batteries, though definitely not a majority. Weather conditions, dust, and other variables could cause your total output to reduce by approximately 30%. Autor tego abooka napisa 18 ksiek w 5 lat (25 tysicy sprzedanych egzemlarzy). When camping without 30W AC service, would it work to use the power from our 2014 model Escape 21's stock solar panel, dual 6V batteries, and inverter to charge our e-bike batteries between rides? Eggscape, that's a useful feature that Ford includes. Wykorzystaj ostatni szans na due, unijne pienidze. Every e-bike has a different charger, and its even worse than the cell phone days because not only do they all have different connectors, but they also have different voltages. Mao znane fakty i naga prawda o dietach i odchudzaniu Jak przeprowadzi badania rynkowe i pozna preferencje klientw. Amp-hours, abbreviated as AH, is the other element of an electric bike battery. 4A Standard Charger fully charges the PowerPack 500 in just 4.5 hours. Jak dziki kursowi szybkiego czytania szybciej zdoby wiedz potrzebn do osignicia sukcesu? Which EVs still qualify for US federal tax credit? No to sprawd. Jeli tak, to dlaczego? Poznaj tajemnice mskiego umysu i dowiedz si: Jak zrozumie mczyzn i odkry jak wana jest prawdziwa przyja w Twoich relacjach z NIM? Dowiedz si, jak zwikszy zyski, usprawniajc swj serwis internetowy i poznajc niezawodne strategie wygrywania w sieci. I want to be able to charge the battery when its detached from the bike, & driving, while the bike is on the bike rack. What Size Battery To Run Fridge? Everything You Need to Know. Nawet jeli teraz jeszcze nie wiesz, co chcesz robi, co osign w yciu i jakie s Twoje marzenia, to dziki tej ksice moesz si tego dowiedzie. Listen up, electric bike companies. How to Charge Electric Bike With Solar Panel. The e-bikes that make up Micahs current daily drivers are the $999 Lectric XP 2.0, the $1,095 Ride1Up Roadster V2, the $1,199 Rad Power Bikes RadMission, and the $3,299 Priority Current. What am I doing wrong. w jaki sposb utrudniamy sobie prac, zamiast j uatwia. Ten ebook to kolejny bardzo praktyczny poradnik, dziki ktremu nauczysz si uczy. How Many Solar Panels Does It Take to Run a House? It is a more sustainable energy choice, and it can provide you with a service that is comparable to that of electricity. (n.d.). What Are The Disadvantages of Non Renewable Resources? Battery voltage is directly proportional to car horsepowerthe more volts in the battery, the more power will be delivered to your bike. przeczytaj wicej Dominika Kukua Sell me a 200W fast charger that uses your own port, thats fine. Czy pracujc na etacie moesz iwestowa i zbudowa zasoby finansowe zapewniajce Ci dostatnie ycie?Nie?

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bosch ebike charger wattage