I would recommend against a simple rectifier solution. The zero contactor will open in a slew of situations. When this happens, depending on your charge rate you will get a small arc which raises your voltage a lot. And if that voltage spike goes over say 144v several internal components of your controller will explode. This is true no matter where your rectifiers are connected, aux or controller.
I honestly this the IP67 solution we have is a lot cheaper than the dangers of trying to hobby this kind of charging on a 15k motorcycle. I mean the SC is built to charge your bike safely in a tsunami basically...
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I am sure the diginow SC is a great product, but i cannot justify using that kind of money at the moment. IF i am going to have a charging solution faster than the onboard 1300W, i will most likely decide on product then wait until i can find it cheap enough- no matter how long time that takes.
I will of course take into account every advice i get, but i still believe i will be capable of building a solution if i can get my hand on the components.
When you bring up the cost of damaging a 15k$ bike, and derating hobby projects, you should thread carefully, because every trade is a wager. When i see the diginow charger closing in on 3k$ in the US for the 7.9kW solution, i know having this shipped to Norway and adding taxes i end up near 5k$. We're talking about 30% of the bikes initial cost or more- if i was about to sell the bike, perhaps more than 50% of the bikes cost... Now i can hold the wager of such a product holding what is warranted against a self made solution that i have carefully planned/considered thoroughly through months, that cost 1/3?. What are my stakes for disappointment, shipping problems, components failing, loss of money, death or injury? I'm not going to fill in numbers on these, but i'm not certain that the odds are in favour of the SC, even if the product in it self is great.
If i had the money (and then some), and needed the solution NOW, i would definitely consider the SC, but the stakes are always higher on what you cannot fix yourself, especially when the only help you can get is overseas. There is also a certain amount of satisfaction by doing things by myself, experiencing, rather than blindly trusting someone elses experience and judgement.