I have a mppt 100/20 controller and I want to add a dc/dc charger 12/12/30. I will have 400ah of battery with 200 watts of solar. Is this mppt enough or should I bump it up? Any guidance on this is appreciated.
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MPPT - Solar Charge Controller on 400ah of battery
I think it depends on a few things. Do you ever plan on expanding, use case meaning how much it’ll be used to recharge, location. For reference if it helps at all, I live in the NE, have 400w on the rv roof connected to a 100/30 and 200w more I can ground deploy connected to a 75/15. With 400ah of LFP04 batteries. Fairly heavy user with a Multi ii and I generally don’t have issues getting the batteries back to full. Hopefully this helps somewhat.
The MPPT is sufficient for the amount of solar that you have. Whether you need more solar depends on you usage and battery chemistry /type. Not sure what you plan to do with the dc/dc charger but the additional power would certainly be helpful.
