Discuss remote solar applications for homes, cabins, RV and boats. If you have a question on equipment for an off grid system, such as charge controllers or inverters, then post your question in this forum. More on solarpaneltalk.com

The 5P is rated for like 3kW flow, burst output about twice that. So honestly think of it as another system that is equivalent to your existing solar, but has a tank of 5. You won't get/want to use all 5kWh of it though, I set my safety to like 25% to run essentials through the night if something happens. But running it without off-grid, there's no real incentive to set the cutoff that high. On a 3kW solar system, at peak the battery would take roughly 1 hours and 40 min to charge from 0. But it'll charge as soon as you produce, so it'd probably take longer than that in practice. I have 1 with a 10kW system, it still takes like 2 hours from production start before it is full. Many installers will spec out 2 battery minimum by default, as that's the rule of thumb to ensure the output capacity of the batteries is available to run AC in off-grid modes. My AC runs at about 4kW, so by their measures I need 2 batteries to run AC at night off grid. Most of the time I run AC, I have solar and battery available, so that's not a major issue. Also the battery can burst to ~7kW for things like the AC. As for appropriate sizing, I suspect you'll see benefit from 1 with minimal information, for more accurate sizing you'd wanna take a look at your actual usage around sunset and the night to calculate how far it would take you. My no-AC usage is generally about .3-.7kW, so in practice 75% of my 5kWh battery is generally getting me about 4-5 hours after sunset, less while the AC is on. If I maxed the battery flow(~3kW), I'd get the same amount of time that it took to charge, so about 1hour and 40 minutes. More on reddit.com

I have a 10KW solar installation to offset the cost of a 3KW server room. I am thinking of installing some batteries to supplement a solar installation for night time use. The solar install was larger than I needed in order to offset low wattage days, or, when the sun didn't shine as strongly ... More on community.se.com

So $900 a quarter, what are your current electricity bills a quarter? What is the total cost of the system? We paid $20,000 for 13kW of panels and a 10kWh battery. We’ve had the system for 2 months and only bought around 6kWh of electricity so far to charge the battery in the early morning before peak time. Got a VPP rebate ($450) plus $200 credit for signing up with our VPP and $200 a year for being with the VPP. We are currently estimated to be $180 in credit for our electricity bill. Compared to bills of approx $4-800 a quarter previously we’re doing well and happy with our set up. More on reddit.com