Ecoflow Delta 2 connecting to batteries and therefore output of Victron SS75/15

AntiqueUniversity · May 3, 2024

Greetings All,
I currently have 2 x 100 bifacials passing through a Victron SS75/15 to 2 x 12v 100ah Litime Batteries.
I want to use the batteries as a backup source for my EcoFlow Delta 2 without disconnecting them from the Victron, so I don't accidentally put PV power into the Victron, by not reconnecting the batteries first. Can I connect an xt60i directly to the batteries without disconnecting the Victron from the batteries? If I step up the voltage from the batteries to increase the input to the EcoFlow is that problematic? Thanks!

HarryN · May 3, 2024

If your goal is to have a back up ( 12 volts ) separate from the ecoflow, then just build them separately and keep them separate.

If you goal is to charge the Ecoflow from the Litime batteries, then just add an inverter and use the 120 vac charger from the ecoflow to charge it up.

AntiqueUniversity · May 3, 2024

HarryN said:
If your goal is to have a back up ( 12 volts ) separate from the ecoflow, then just build them separately and keep them separate.

If you goal is to charge the Ecoflow from the Litime batteries, then just add an inverter and use the 120 vac charger from the ecoflow to charge it up.

Thanks for answering Harry. My goal is primarily to charge the Ecoflow from the batteries. I did add a 300 W inverter into the mix and it just started up, shut off, started up, shut off, etc. I have a second configuration I can make rather easily as I have the components. I still wind up with the same question:
Will leaving the Victron MPPT connected to the battery when connecting the battery to the Ecoflow cause any problems.
I'm attaching an image of the second configuration.

HarryN · May 3, 2024

AntiqueUniversity said:
Thanks for answering Harry. My goal is primarily to charge the Ecoflow from the batteries. I did add a 300 W inverter into the mix and it just started up, shut off, started up, shut off, etc. I have a second configuration I can make rather easily as I have the components. I still wind up with the same question:
Will leaving the Victron MPPT connected to the battery when connecting the battery to the Ecoflow cause any problems.
I'm attaching an image of the second configuration.View attachment 213166

Take a look at the eco flow unit's 120 vac charger wattage rating. The inverter wattage rating will need to be at least 50% larger than that number to work and ideally double in order to use it for charging.

What you are trying to do is not as easy as you think. It might make the most sense to look a their user community and post there to see if any of them have been successful - but only do this if you really know your way around Li battery chargers and settings details.

Here is the section of the forum specific to all in one type systems. Perhaps a search there will help ?

All-in-One Systems

diysolarforum.com

Brucey · May 3, 2024

AntiqueUniversity said:
Thanks for answering Harry. My goal is primarily to charge the Ecoflow from the batteries. I did add a 300 W inverter into the mix and it just started up, shut off, started up, shut off, etc. I have a second configuration I can make rather easily as I have the components. I still wind up with the same question:
Will leaving the Victron MPPT connected to the battery when connecting the battery to the Ecoflow cause any problems.
I'm attaching an image of the second configuration.View attachment 213166

This works fine for me, when I was charging 24V 100Ah batteries using 150/35s, and at the same time that battery was connected to my Delta 2 max on one of its mppt ports. As far as the d2m sees it was just a 28V input, and it will take the 15A max the port can accept. the SCC is just providing power to maintain the 28V setpoint.

Also now I have the d2m connected to my 48V power bus direct with ring terminal to mc4 coming off my lynx distributor and then two mc4 to xt60i cables going to both the mppt ports, for 1000W of charging. there's about 4200W of panels on a 450/100 doing the charging and 12.5kWh of battery.

Brucey · May 3, 2024

If using a 300W inverter, you would need to adjust the charge power to closer to the minimum of 200W in the ecoflow app for your Delta 2, and set the switch next to the power input so it will draw less than the max charge rate of around 1500W:

If going direct from the battery the other option is to series those two 12V batteries to double the power for the mppt input.

AntiqueUniversity · May 3, 2024

HarryN said:
Take a look at the eco flow unit's 120 vac charger wattage rating. The inverter wattage rating will need to be at least 50% larger than that number to work and ideally double in order to use it for charging.

What you are trying to do is not as easy as you think. It might make the most sense to look a their user community and post there to see if any of them have been successful - but only do this if you really know your way around Li battery chargers and settings details.

Here is the section of the forum specific to all in one type systems. Perhaps a search there will help ?

All-in-One Systems

diysolarforum.com

Thanks for the navigation assistance Harry. I'll check more in the All in one's

AntiqueUniversity · May 5, 2024

Brucey said:
If using a 300W inverter, you would need to adjust the charge power to closer to the minimum of 200W in the ecoflow app for your Delta 2, and set the switch next to the power input so it will draw less than the max charge rate of around 1500W:

View attachment 213198 View attachment 213199

If going direct from the battery the other option is to series those two 12V batteries to double the power for the mppt input.

Thanks for the screenshots Brucey. That 200 watt setting also matches Harry's 2/3 target point for the 300 watt inverter. I tried that inverter setting for my Plan B and it worked. I'll switch to the series 24 volt battery for direct charging, now that I'm not concerned about blowing out the mppt. I'll probably put the step up converter in too, unless there is a reason not to.

vallesj · Saturday at 9:45 AM

Brucey said:
This works fine for me, when I was charging 24V 100Ah batteries using 150/35s, and at the same time that battery was connected to my Delta 2 max on one of its mppt ports. As far as the d2m sees it was just a 28V input, and it will take the 15A max the port can accept. the SCC is just providing power to maintain the 28V setpoint.

Also now I have the d2m connected to my 48V power bus direct with ring terminal to mc4 coming off my lynx distributor and then two mc4 to xt60i cables going to both the mppt ports, for 1000W of charging. there's about 4200W of panels on a 450/100 doing the charging and 12.5kWh of battery.

Normally a battery gives as much amperes as the load is requesting unless the battery is capped. So I believe those powerbanks will request the max they can which I believe is the limit they indicated. Normally that Port is also used to charge the bank from a car battery.

Ecoflow Delta 2 connecting to batteries and therefore output of Victron SS75/15

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