Shawn987 wrote: ↑
Tue Jan 14, 2020 4:32 pm
Raysun, how'd that work out in the long run? You had mentioned it's typical for people to wreck their first battery bank. Did you manage to be the exception to that rule?
Also, do battery's lives get shortened mainly due to over depletion or is there another potential cause that I should be mindful of?
Still waiting to hear from Renogy, in the meantime I ordered two more batteries and a batt monitor.
Question for Raysun or anyone. Will this be a sensible configuration: 6 300 watt panels (all of which get very good sun exposure) plus my 25v 3000 watt Aims inverter plus the four 200ah batteries (in two strings) Does this sound like a system capable of taking on a small daily task, ie. a couple of lamps in the evening and our small EnergyStar fridge. Are the odds good that my batteries will reach their intended life span? I mean provided
I watch the monitor very closely and don't neglect that, ever!
That system will work just fine for your initial usage scenario. The battery monitor will be your lifesaver and the service-life saver of the battery.q
Good sun exposure is good, but "good sun exposure" is subjective. There are online tools that will take your address as input and give you a detailed estimate of sun exposure in measured values at monthly and even weekly resolution. You can calculate solar harvest and have baseline working numbers for your array. Read up on the impact of panel placement, shading, etc. Just spitballing, the 6 x 300 = 1.8kW array might harvest power for 6-8 hrs/day in winter and 10-12 hrs/day in summer. Daily production might be near zero on stormy day, and 8-12 kWH on a sunny day in summer.
You will get a first hand measure of actual solar harvest daily from your charge controller / battey monitor. The monitor should help track charge drawn from the battery. You'll know in short order what your daily power consumption is, so what you need to put back. Plan on one discharge/charge cycle to occur every 24 hours. Your "at home" cycle. You can plan an "away from home" cycle for weekend trips, vacations, etc., that may have lower daily discharge and longer charge cycles. The battery can hang around between 100% and 50% SoC for a week or two without undue wear as long as its fully recharged promptly on return. A "freshening charge" is often recommended by the battery mfgr after such an extended period of partial SoC.
Makeup charging using a 2nd source will become SOP as well. The system will become convenient, useful, and will see increased demand during at home cycles most certainly. Energy debt should be paid promptly. As mentioned, practical sources are grid and generator using an AC charger. Extended grid outages and low solar output days will make the generator option desirable.
Since you are in an area that has reliable grid power you have the latitude to "ease into" the solar plus storage usage and maintenance disciplines. The reward for mastering the knack is you can use it more, remove loads from the grid, and get to put a happy sticker on the electric bill. It all doesn't need to happen at once, as I'm sure you know, and are planning for.
I'd say your demand floor to be 1.5 - 2.5 kWH/day. You might make it an exercise to guarantee the refrigerator and emergency lights runs off grid 7x24x365 and system manage to that goal. (Challenging you to not do the hippy-in-the-woods refrigerator on a timer thing.) Minor loads like computer, phone chargers, etc., become priority "B" loads. Goal is to balance consumption to harvest. You'll get the hang of it and learn to manage your battery well.
Did I ruin my first battery? TBH, no, but I pre-ruined enough batteries before putting in my system to make up for it.