whatismouse
New Member
- Joined
- Oct 11, 2020
- Messages
- 76
I have an mpp solar 48volt, 3000 watt inverter/charger (3048lv-mk), installed in an RV. It is my first inverter so I don't know what features differ from other models on the market. But in any case, I want to replicate the super user-friendliness of something that most of us experience every day: take for example the experience of a phone, you can run it down to 0%, and then just plug it in wherever and whenever to charge it back up.
If my battery bank runs down to 0%, the experience is much less convenient. Currently I have a non-adjustable low-voltage disconnect of 42 Volts at the BMS, and an adjustable low-voltage cut-off at the inverter. If either of these events occur, I believe the inverter shuts off. If the inverter shuts off, afaik, the charger is also off. In which case it doesn't matter if I connect AC power, or if I'm bringing in Solar, its too late. My only recourse at this point is to introduce an external charger, connected to AC, to charge the battery enough that the inverter will turn on again?
Ok I partially understand why these settings are like this, they are meant to protect the battery from damage. The inverter must shut off so that there are no further loads on the battery.
But shouldn't the inverter be able to turn itself back on when it senses an AC or DC input, so that it can charge my battery? It seems crazy that I could literally have my pick of charging inputs: plentiful sun, AC power, a generator, and nothing will re-charge my battery because the inverter won't turn on.
OR
Is there a way to create another event, that occurs at a specified SOC, that would put my inverter in charge-only mode. With only the inverter on, I could hang out in this mode for quite a while before the battery discharges to the LVC, and during that time, the inverter is on and available for whenever a source of charging input makes itself available?
Basically I'd like to have it set up so that its stupid easy and doesn't need to be monitored. Things will just turn off when the battery gets too low, but charging can still occur. When SOC again increases to a set threshold, loads turn back on.
If my battery bank runs down to 0%, the experience is much less convenient. Currently I have a non-adjustable low-voltage disconnect of 42 Volts at the BMS, and an adjustable low-voltage cut-off at the inverter. If either of these events occur, I believe the inverter shuts off. If the inverter shuts off, afaik, the charger is also off. In which case it doesn't matter if I connect AC power, or if I'm bringing in Solar, its too late. My only recourse at this point is to introduce an external charger, connected to AC, to charge the battery enough that the inverter will turn on again?
Ok I partially understand why these settings are like this, they are meant to protect the battery from damage. The inverter must shut off so that there are no further loads on the battery.
But shouldn't the inverter be able to turn itself back on when it senses an AC or DC input, so that it can charge my battery? It seems crazy that I could literally have my pick of charging inputs: plentiful sun, AC power, a generator, and nothing will re-charge my battery because the inverter won't turn on.
OR
Is there a way to create another event, that occurs at a specified SOC, that would put my inverter in charge-only mode. With only the inverter on, I could hang out in this mode for quite a while before the battery discharges to the LVC, and during that time, the inverter is on and available for whenever a source of charging input makes itself available?
Basically I'd like to have it set up so that its stupid easy and doesn't need to be monitored. Things will just turn off when the battery gets too low, but charging can still occur. When SOC again increases to a set threshold, loads turn back on.
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