I have a Mains AC-DC charger + Smartsolar MPPT 75/15 controller both connected to a Lithium 100Ah battery. The plan is to use PV when sunlight is available & mains charging other times.
Q: Do I need to isolate the MPPT when using the AC/DC mains charger? Or can both be simultaneously hardwired to battery? (Alternating between the two charging options as conditions permit).
It is OK to have both chargers connected. So they share the "work" in case.
Regards,
Markus
I also want to do this.
If both are connected to the battery, won't there be a chance of over charging?
I'm thinking the AC mains charger being connected and simultaneously on a sunny day the Smart Solar also doing its thing.
Or is there a way to get a Smart Solar and AC charger to talk to each other?
Hello, doing this you can think of that you want to use the sun as much as possible. If you have a Victron Multi/Quattro with a Victron MPPT, then you can do this very good with the ESS assistant. Works perfectly.
https://www.victronenergy.com/live/ess:design-installation-manual
good luck with your project.
Just to let you know, I do this also: 12/800/35 MultiPlus, MPPT100/30, 2x PV panel, one LiFePO4 with BMS. In the day all works on the Sun, and the night from the grid. If grid fails... I have the battery.
Did this work OK? I'm planning on doing the same thing. But I dont quite understand how having both chargers connected simultaniously doesn't cause issues.
