Li batteries at 48vdc
After much deliberation and questions, I'll likely be purchasing the 48v Lithium battery pack instead of 4-12v. I liked the idea of 12v batteries for weight and ease of handling, but the possible cel...
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2oldman wrote:time2roll wrote:I do. And a 12v. A tech says I'm better off with 1 battery pack.
Do you still have that 24v inverter? Maybe it would perform better with lithium.
That was when using one charger IIRC. The balance issue between batteries is solved by using one charger for each battery so they can recharge at different speeds and eventually all get done as in that blurb's 36v example.
(Output from the bank is still 48 to run the inverter and the 48-12 DC-DC. of course)
The eight -wire charger could run four Grapes. Not sure each Grape would get the same input so to have the same output to keep each battery recharging equally. It would not have to be perfectly equal, just close, so there would not be a long wait for the last battery to get done.
I am not so sure you can run four Grapes from one unified array though. I tried splitting array input with a Y to two identical controllers and it worked for total amps, but I was not able to measure how many amps went to each leg. ( It didn't matter when both controllers were on the same battery. I was just trying to reduce the amps on each controller to be under the controllers' rating where the total amps was over what one could handle.)
Have to be a miracle to get equal Rs on each leg. You want each battery to recharge at about the same rate so splitting the array into four equal parts would give the same total output plus (perhaps) be more evenly divided for input to the four controllers.
You still can't have solar and power supply going to the same controller and then have just four. Got to have eight.
