So I have now sent back the Samlex inverter for return, and I have placed an order for the real deal Vagabond II inverter.
I don’t want to imply that I think the Samlex inverter is not a good product. That is not the case at all. The 150w model is just is not sized appropriately for the task. (My fault I know) And to move to a model that is up to the job is nearly as expensive as getting the actual Vagabond II. Another benefit of the Vagabond II is that it has built in battery charging which the Samlex does not. This was not an initial consideration for me as I already own a BatterTender, but for the same price I might as well get the all inclusive option.
So I guess it is really becoming less a ‘DIY” Vagabond. I’m eagerly awaiting the new inverter to see if it really will work as I need it to!