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Hi, I wonder if the smartsolar mppt (75/15, 100/20) support the inverter with solarpower even if the inverter is connected directly to the battery. This would save the battery's aging a bit in terms of cycle life of a lifepo4 battery. I just ask because i heard that the load-output is always synced to battery-Voltage so that solar power is used first if there is any available, so maybe for the bat-connection it would be the same.
Thanks
Hi @keves
I believe it will just by the nature of how power is being drawn from the system. The inverter isnt really choosing whether the power is coming from battery or solar. It's just drawing power from the DC system as a whole.
So if solar is providing 100w and inverter is using 100w. The 100w of solar isn't going into the battery and then back out. It's going from solar to inverter.
That being said you will need the battery connected as a buffer. ie if solar goes down the inverter will need power to sustain itself.
Hi @matt1309
Generally you are right, if there are 2 active power sources in a circuit. But if the bat-conection would be switched on by a mosfet just when charging, and else it would be switched off, then there would not be this 2nd power source in the circuit.
But as told i heard that on the load conection the voltage is synced with battery voltage by algorythm, thus maybe the bat-conection is as well "always-on" and voltage-synced and so solar power would be drawn as well in this case. But as both power sources would have same voltage, the consumer draws just 50% of the energy needed from solar power, but still better than 0.
