I have a campervan with two 110Ah batteries in parallel. I want to add a IP22 charger so that I can charge my batteries when at a campsite. I have two questions:
1) From the IP22, do I connect the negative to the negative of my battery or to the chassis of the van where my battery is earthed to?
2) Will I be able to still use the battery to power my interior lights and other small items, whilst the IP22 charges the batteries at the same time?