DerpsyDoodler
Solar Addict
- Joined
- Jan 10, 2021
- Messages
- 2,247
Also, I'll qualify my previous post with this addition:And with that said, charging does not require the charger to "see" the battery. If a circuit is complete, then power can flow. Charger pushes at x charge voltage to a max of y current. if it can flow then it can flow. Charger requires no specific knowledge of battery voltage. It just knows what its supplied voltage is being drawn down to and what current it's sending.
dumb chargers require no specific knowledge. auto sensing (12/24v capable chargers) require knowledge of the battery voltage. Some of those sense the first time, then remember it. Others sense it every time (if set to auto-sense). Regardless, the EPEVERs power themselves from the battery.
I doubt that functionality is intentional, and I wouldnt rely on it in practice. Its probably just a by-product of good-enough design. That said, and like upnorth said, straying from the topic. recap:Yes exactly. If the SCC is off, and I put a source on it's battery output, it turns on. If there's solar it starts charging and I can remove the source... it stays on and will charge the regular battery no problem. As soon as the panels are disabled though it shuts off again. ie. Once it starts, it can charge no problem as long as charging is enabled on the BMS. If it has no source - like the BMS discharge FETS or the PV - it turns off.
BMS is last line of defense. get the battery protect going to sense bus voltage and trip the inverter's power switch. If you have DC loads other than the inverter and SCC, you'll want those on the protection side of the battery protect (assuming they're small enough to be under the battery protect's amp rating).