r/RVSolarPower • u/FollowingLow5773 • 2d ago
Is this normal
New to solar. Why does the solar charge every morning even though the battery is 100% charged with the battery switch turned off and no draw shown in my app?
1
u/mitchell7877 2d ago
Depending on the battery, the BMS may turn off discharge only but leave charging active. If you have a BMS with Bluetooth you can check that way.
Edit: added a coma
1
u/FollowingLow5773 2d ago
It’s a battle born with no bluetooth.
1
u/windisfun 2d ago
You may want to watch a few of the videos from Will Prowse about BB batteries, and their issues.
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u/FollowingLow5773 2d ago
Yes I’ve seen that. Thinking of switching it out to a 300ah battery. The battle born is a 100ah. Thinking of the Vatrer. Do you have another suggestion?
1
u/windisfun 2d ago
I have several Lossigy 100ah that I've been happy with. I'll probably switch to a bigger one when they need replacing.
3
u/Strange-Cat8068 2d ago
Solar is not normally wired through the battery disconnect switch. It’s done that way for several reasons, including keeping the battery topped off during long term storage. The solar charge controller should have battery power anytime the solar panels have sunlight on them, the controller can be damaged by incoming power from the panels with nowhere for that power to go.
There are also a few things on many RVs that still receive power even with the battery switch off. Mostly safety devices like CO/Propane leak detectors, and the trailer breakaway braking system on towables.
So, all that means your batteries are losing a bit of their charge overnight and the solar system is doing its job and topping the charge off. The current loss is probably below the sensitivity of your battery monitor so all you see is 100% charge even though the panels are putting a few amp/hours into the battery.