Recent content by Luthj

My 12k has Gen load limiting which appears to work just fine. The adjustable Gen drop out parameters have a good range, and can be adjusted conservatively.

Do you happen to have a source from where you heard this info? A crap generator could damage the inverter in the same way it could damage any connected device. I am not aware of any minimum gen size for the sol ark 15k.

For very dirty or unreliable power, an isolated charger is a good choice. Grid tie/hybrid inverters typically pass through the grid connection when operating in parallel, and will sync to the grid. You take a significant efficiency hit by going from grid-DC-inverter instead of consuming grid...

Feature Request I would like the option to track generator powerfor data presentation/charting purposes. At least for Deye family inverters. Either from adding the Gen input to the main chart, or by toggling the Grid or Gen. There are a variety of situations where the Grid input isn't...

A few misc items. Disconnect - I don't think I need one on the grid/hookup side, as the pedestal will have a breaker. The inverter has an integral PV disconnect. Transfer switch - I don't see much value in a double throw transfer switch to bypass the inverter completely, but I am open to...

For panel mounting I am considering running aluminum half height unistrut the length of the roof and then using clamps like the ones shown below. I will use spacer blocks under the unistrut (about 1/4") to allow drainage, and screw the strut to each of the joists. Two clamps on each edge long...

Greetings, Quick background, we live in a large 5th wheel, and are intending to be grid independent 95% of the time. To this end I installing as much PV as will fit on the roof, and a battery/inverter system. Attached is a rough schematic, and I will list the core components I am currently...

I may not have been clear. You want each cell block (logical cell group), to have the same capacity. Otherwise the pack will be limited by the 2 lowest capacity cells (matched together). So you want to pair cells in such a way that each pair has as close to the same capacity as reasonable...

Depends on your current. High current applications should match against IR, so each cell in the block shares current equally. Lower current applications should pair cells so that each block/group has the same capacity. Your IR values are close enough that contact resistance variance between...

I wish there was a decent auto tilting mechanism out there (for RVs). Haven't found one yet at least. Even 10 degrees would make a big difference!

If you operate within the middle 50% SOC, then it can take years for imbalance to appear. Most of us don't want to spend double on a pack, so we use 90% or so of the total capacity when needed. Which is why it's a bit disingenuous/ confusing to make some broad claims when operating a system...

Agreed. In fact due to cell to cell variance, in the middle range two cells of the same soc can have 1-2 mv of difference as well. Which is why attempting to balance in this range can actually create a worse imbalance. This imbalance can be unseen until the pack is taken to high or low SOC...

If the pack is operated continuously in the flat area of voltage curve, no balancer, active or otherwise, can counteract differences in self discharge. This is why regular top ups to the knee area are often required to avoid significant SOC drift with small parallel cell count packs. EVs...

I don't think two separate batteries with solve your drift issue. The primary issue causing the drift after an extended period without a top balance or float, is due to differences in self-discharge between the cells. This is due to manufacturing differences but also due to temperature...

Obviously these cells were likely damaged at the factory. But it can't hurt to remind everyone. These "blue" aluminum cased prismatics are a component, designed to be built into a well designed battery. They have the bare minimum of case thickness, and insulation covering for that purpose...