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@BackofBeyond RB, this is new for Oliver, and I don’t know what charger they’re using, but the “up to 20 amps” likely depends on the tow vehicle. Assuming you will get 20 amps, it will cover the refrigerator (3–5 amps) while driving, with 15–17 amps left to charge the battery. That’s on top of about 20 amps of solar on a sunny day. For perspective, the DC-to-DC charger will add back 15–17 amp hours per hour of driving, or 75 to 85 amp hours on a five hour drive. That’s about 20% of your 400 amp hour battery. So whether you need a higher-amperage DC to DC charger will depends on how much off-grid boondocking you do, your power needs, and how much you drive between stays. For example, the refrigerator alone uses roughly 50 to 100 Ah per day depending on weather temperature. Typical loads (lights, pump, parasitic loads, phone chargers) will add about 20 to 35 Ah a day. Heavy loads like Starlink, leaving the inverter on, the furnace, or fans can add another 50 to 100+ Ah per day. On the positive side, the 400 watt solar can replace about 100+ Ah on a sunny day. You're getting a really good system, and real world experience will tell if it’s enough for your particular needs. Frankly, tankage capacity, not batteries, is typically our limitation when boondocking. Hope that helps, and cheers to the start of your great new adventures! Geoff