I bought a nearly new conversion on a Ford Transit Cargo van that includes the optional 2nd alternator. We have 5x 100amp Battleborn batteries hooked up in parallel. We have a Renegy 60amp MPT solar charger. We have a Sterling 60 amp DC to DC charger. We have an Aims 5000w inverter. We have 2 solar panels 175 watts each hooked up in parallel. We have a Dometic Penguin 2 air conditioner. For the first year, the original owner did not have the DC to DC charger hooked up. There is no shore power connection. The original owner solely relied on the solar to charge the battery bank. We suspect he never got it fully charged. He did not use the air conditioning because he said he did not need it. We have not been able to use the air con. We believe it is because we have an inadequate charge. Before we hooked up the DC to DC the highest voltage we could get from the solar was 12.5 to 12.6. After hooking up the DC to DC charger and driving for 6 hours, the highest we could get was 13.0v. It is insufficient to run the air con. What am I missing? Why can't I get the battery bank up to 13.6-13.7v?
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