Hey @Spider85, running both is largely redundant in your case. The DC-DC charger is doing the proper job already — it's isolating your starter battery, managing the charge profile correctly for...
To add to what @JackHunt is getting at — it's worth checking your actual BMS spec sheet, @FormerMechanic, because some cheaper units do cut discharge at low temps as well, not just charging.
Been running a Victron Orion-Tr Smart 12/12-30 in my Transit conversion for about eight months now and generally it's been brilliant. Charges my 200Ah lithium leisure battery nicely on the move.
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