Victron B2B Charging

I would be grateful if the members that are electrically competent have a look at my postings on this Technical Chat Thread:

"Vehicle Battery Fuse"
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Thanks Richard ( Baggiecamper )

Dbvwt wrote:............why you went down this upgrade route? 

Hi Dave
The ambition is to do off grid with limited solar all year round.
So a bigger 200AHr deep cycle battery and a 30 amp B2B is what I have gone for.
I liked the reputation of Victron and that all their devices work off one Smart phone app.
I am also installing a 1500W inverter as occasional light use of the microwave would be advantageous for me.
Since I chose Victron I am beginning to think Renogy combined B2B and MPPT may have been better, although I thought 20 amp B2B may be too small and 40 amp too large.
This was supposed to be a winter project but life's not going to plan at the moment 

Baggiecamper wrote:
Hi Dave
The ambition is to do off grid with limited solar all year round.
So a bigger 200AHr deep cycle battery and a 30 amp B2B is what I have gone for.
I liked the reputation of Victron and that all their devices work off one Smart phone app.
I am also installing a 1500W inverter as occasional light use of the microwave would be advantageous for me.
Since I chose Victron I am beginning to think Renogy combined B2B and MPPT may have been better, although I thought 20 amp B2B may be too small and 40 amp too large.
This was supposed to be a winter project but life's not going to plan at the moment 

I think the renogy  DC-DC Mppt could have possibly caused problems also as reading about them it’s not advisable to use both inputs at the same time