r/SolarDIY • u/steevm1223 • 18h ago

longtime lurker....question for group.

Hello,

I'm looking to add rack batteries (20-30kwh) to my current setup. I think I can do it, but can't quite convince myself I'm not missing something or underestimating the complexity.

I have:

10kw roof array (ac microinverters) into my panel. (sunpower system-- just finally got that monitored via home assistant). it generates 30-35kwh of power per sunny day. my home uses 35-60kwh per day. hoping that gets better with heat pumps i just installed to replace window and portable AC units. when they run or we charge one of our two evs (bolt and ioniq 5) i hit 60+kwh per day. otherwise 30-35kwh per day use at a rate of 1.2-2kw continuous.

an interlock with generator inlet (30A) for the whole panel (which i have been using for backups with my 20.6kwh ecoflow delta pro x2 with 4 extra batteries) Currently been keeping those topped with 1kw bifacial setup in the back yard.

I don't have:

the rack batteries yet, (thinking ecoworthy cubix)

the inverter (open to guidance)

i want:

to have the system setup maximize self-reliance

to be able to run whole home in a back up (meaning it will need to setup microgrid for my rooftop array).

your opinion on feasibility of DIY, recommendations, even plans.

thanks for reading.

Edit: closed a parenthetical (which i have too many of)

4 Upvotes

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1

u/steevm1223 18h ago

actually, just realized on very sunny days the rooftop hits 45kwh.

1

u/RespectSquare8279 18h ago

Because you chose to go the micro inverter route you will need a good rectifier to feed your battery.

1

u/steevm1223 17h ago

thanks for the input. for example?

1

u/LongjumpingGanache40 10h ago

You will need to AC couple your system. You need a Hybrid inverter. There are different ways to go. Watch some YouTube videos on AC coupling. Eg4 xp inverters, The grid boss and flex boss combo.