Hi, this is Matt and I’ve been converting my 2005 Honda Odyssey for camping and road trips. It’s no sprinter but it’s good for a weekend away or a few days driving between destinations. I’ve so far tried to build it out with off the shelf components that i can use elsewhere as needed, one of those being an Energizer Arc5 battery station. Similar to a Jackery or others, 550 Wh, I like that it is portable, can be used for other things, has all the different ports, and a variety of charging options. I’m in the process of installing a 175W solar panel on the roof that generally should be good for recharging the battery during the day when parked, and I’m building a little relay box to switch from solar to accessory power when driving. So far so good…
I have a high load between a cooler and a medical device that pretty much drains the battery over night so I’m kind go at the mercy of the sun at that point. I’m wondering about adding another battery to the system as a backup that I could charge from shore or vehicle power when available and use to recharge the battery station (the battery station is still where I plug everything in). Yes, I know I should have designed a bigger system from the start but no regrets. Since the battery station take 12-24V input, has a charge controller, and can be used while charging what would I need to do to charge it from a second battery - just hook it up and let 'er rip?
I’m not trying to integrate these seamlessly. The battery station is not wired into the car electrical apart from tapping into accessory power. The second battery would be completely standalone, just there as a backup charger for the power station.
Does anyone have any thoughts about this?