BigT said:
I think it's time for a new inverter.
Wagan is not known for their high quality components.
At 400 watts, your inverter is just barely powerful enough. 3 Amps times 120 volts equals 360 watts. Keep in mind that most things like chargers and tools use a bit more current when first starting up. So a 500 watt inverter, that is from a quality manufacturer would probably work for you. Though, that would then still only be able to handle your eBike charger, with nothing else plugged in to that inverter. There is nothing wrong with having multiple inverters, if your batteries, panels, and charge controller can handle it.
Now, you said your eBike charger is 100-240 watts. Based on the current usage you listed, I'm guessing that means that is how much power it is able to put into the eBike battery. This makes sense. All these things are notoriously inefficient. So consuming 360 watts while only putting out 240 watts is about right.
Also, remember that 360 watts at 120 volts is still 360 watts at 12 volts. But, you would be drawing 360/12 or 30 amps out of your 12 volt system. And that doesn't account for the inefficiency of the inverter. So you will actually be drawing about 35 amps out of your 12 volt supply. So your 30 Amp fuse wouldn't really be enough to handle your current. It would be better to get a 50 Amp breaker. If you mount that breaker where you can easily get to it, you can use it as a switch for your inverter.
Now, the next problem is: Can your 12 volt system provide a constant 35 amps for long enough to power the inverter that is powering the eBike charger. Just because you measure 14 volts on your 12 volt system with the inverter turned on, does not mean that your 12 volt system is providing enough current to run everything. If everything was just batteries and resistors, then the math would be easy. However, once you get electronic voltage controllers involved, things get too complicated to judge just by taking a voltage reading. Instead, you have to calculate based on what you know your components are capable of.
First off is your battery: What battery are you using to power this whole thing? Or are you only powering it from your alternator while the engine is running? (Sorry, I did not read the entire thread. It gets tiresome reading through all the mythology that gets spread around here. I saw that your questions were still not answered, so I am jumping in to see if I can help.) If you are powering this off of a lead-acid based "house" battery, then you will likely need about 200 Amp hours worth of batteries. Keep in mind that you should not expect to charge your e-bike battery off of the house batteries. Given that one should only use about half of the Amp-hours in a lead-acid battery, and if you are using power quickly, as this eBike charger would do, then you can only get about half of that out of the battery before it is down to 50%. This would only give you about 50 Amp-hours of house battery that you could use for charging the eBike. That would last you less than two hours. No, I am guessing that you would need this 200 Amp hours to act as a decent buffer for the charge controller, which would be directly providing most of the power going into the eBike charger (unless you are using your alternator).
Second is your charge controller: It should be able to provide about 50 amps of power at 12-14.5 volts. If your charge controller can't provide 50 Amps, then all the additive inefficiencies will leave you with not enough power at the eBike charger.
Third, are your solar panels: Can they really provide the 600 watts of power that this whole mess will need, once you account for the inefficiencies of the eBike charger, the inverter, the charge controller, and wire resistance? And do so on a continuous basis? I've got 610 watts of panels on my roof, but I don't expect them to ever put out 610 watts because they are laying flat on my roof. You would need maybe 900-1000 watts of panels to power this whole thing. And that's on a sunny day.
Yup. 30 amps is a hell of a lot to expect from a solar system. It can be done. Just ask JimInDenver. But it ain't cheap.