Search found 4006 matches

by tallgirl
Thu Dec 03, 2015 2:37 pm
Forum: AXS Port
Topic: Changing Settings via AXS
Replies: 3
Views: 6204

Re: Changing Settings via AXS

First question, given that you're not walking the map correctly, is are you sure you're reading the correct register? And are you sure you're writing a valid value back to that register? If you don't already have a copy of the model for whatever device you're trying to program, go download it from t...
by tallgirl
Thu Dec 03, 2015 2:32 pm
Forum: AXS Port
Topic: Modbus basics
Replies: 14
Views: 19256

Re: Modbus basics

Well ... I was paid a very large pile of money to work on SunSpec-compliant monitoring stuff and on megawatt-scale systems, so I'm fairly sure I know what I'm talking about ;) Depending on how you number your Modbus addresses, SunSpec starts at address 40000 ... or 40001. That's one of the joys of M...
by tallgirl
Wed Dec 02, 2015 8:44 pm
Forum: AXS Port
Topic: Modbus basics
Replies: 14
Views: 19256

Re: Modbus basics

The data format is SunSpec. There's a SunSpec "end block" which terminates the variable length data structure which started at address 40001. (Edited to elaborate -- I've spent years looking at SunSpec and that wasn't the best of information for the uninitiated!) The Single Phase Inverter block is e...
by tallgirl
Thu Jan 08, 2015 7:18 am
Forum: RADIAN Series
Topic: Do I have a Shunt connected backwards?
Replies: 6
Views: 4489

Re: Do I have a Shunt connected backwards?

Hey, I'd =love= to have a Volt instead of a LEAF. The Volt has a much smaller battery and at least I could re-charge it once before having to give up in dispair. How well are you able to recharge the Volt off the grid? I have 430Ah and the load on the batteries with the charger running is close to 1...
by tallgirl
Tue Jan 06, 2015 6:53 pm
Forum: Off Grid Applications
Topic: Trying to understand duel inverter operations
Replies: 1
Views: 1299

Re: Trying to understand duel inverter operations

It's more efficient to run the charger at a higher output rate. My dual grid-interactive inverters do the same thing -- they'll both start at out the limit (yours should if you need a lot of charge) then gradual decrease. Eventually they reach a point where the slave stops charging and the master pi...
by tallgirl
Tue Jan 06, 2015 6:49 pm
Forum: Grid Tie Applications
Topic: Radian dropping its AC output. Why?
Replies: 7
Views: 7448

Re: Radian dropping its AC output. Why?

If your lights are strobbing it sounds like you have incandescents. You need to get them replaced. My LED lights only flicker when something is SERIOUSLY wrong and they draw 1/12th the power.
by tallgirl
Tue Jan 06, 2015 6:47 pm
Forum: RADIAN Series
Topic: Do I have a Shunt connected backwards?
Replies: 6
Views: 4489

Re: Do I have a Shunt connected backwards?

Oh, I remember when I was a n00b. My system was installed and the first thing I did was disconnect from the grid, then go have dinner. This was before I understood how any of this stuff works, and long before the house was as energy efficient as it is today. I came back from dinner and my poor batte...
by tallgirl
Tue Jan 06, 2015 5:43 pm
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

Lance, Use the target Trojan gave you. 56.4 is too low, unless they are AGMs, which they aren't since you can stick them. Yes, chronically low SG after being "fully charged" is a sign of being under-charged. But charging too high can cause its own problems, so ... use the target that Trojan gave you.
by tallgirl
Mon Jan 05, 2015 7:36 pm
Forum: Grid Tie Applications
Topic: Move panels from grid tie to GVFX3524
Replies: 3
Views: 2996

Re: Move panels from grid tie to GVFX3524

The inverters are around 90 to 95 percent efficient, depending on the amount of power you are producing. However, end-to-end efficiency for battery-backed grid-interative systems is typically 70 to 75 percent efficient. You have to decide if the loss of energy harvest is worth the peace of mind of h...
by tallgirl
Mon Jan 05, 2015 7:18 pm
Forum: Grid Tie Applications
Topic: Radian dropping its AC output. Why?
Replies: 7
Views: 7448

Re: Radian dropping its AC output. Why?

No, there is always a very brief transfer delay, but it shouldn't be more than a very brief flicker. I have a pair of GVFX3648s and I see it. So, if you don't with G-series inverters, you aren't watching really, really closely.
by tallgirl
Mon Jan 05, 2015 7:02 pm
Forum: RADIAN Series
Topic: Do I have a Shunt connected backwards?
Replies: 6
Views: 4489

Re: Do I have a Shunt connected backwards?

FWIW, if you are absolutely certain they are wired wrong on the shunt you can reverse them on the terminal block that goes into the back of the FlexNET DC, which may be easier to get at.
by tallgirl
Mon Jan 05, 2015 6:59 pm
Forum: RADIAN Series
Topic: Dual Radian stacking and inverter bypass switches
Replies: 3
Views: 3992

Re: Dual Radian stacking and inverter bypass switches

There are breaker interlock kits that can be used to build your own bypass. They prevent having more than one breaker closed at a time. You do NOT want to rely on "make sure you never do that" because sooner or later you'll do that. I'm on the wrong laptop to give you the link, but "circuit breaker ...
by tallgirl
Mon Jan 05, 2015 6:48 pm
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

Aloha, David -- Grid-interactive solar isn't the great deal that off-grid solar is, especially now that string and micro inverters have come down in price, right along with solar panels. Batteries haven't experienced the same 90% drop in cost. The real value of grid-interactive solar is the security...
by tallgirl
Sun Jan 04, 2015 9:57 pm
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

Here's a close-up of the transition from negative to positive net amp-hours. As I wrote earlier, "Parameters Met" didn't happen until 23:19 and as you can see the net amp-hours not only were positive, but kept becoming more positive while the BCF corrected amp-hours were still negative and climbing....
by tallgirl
Sun Jan 04, 2015 9:30 pm
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

Alright, nothing is going to convince people things don't go wonky just because Net Amp-Hours reaches zero unless I post a chart. So, here's a chart. Some interesting tidbits -- The SOC when I started was around 97% The downward curve is how you can see I was actually in Absorb. The charts I've seen...
by tallgirl
Sun Jan 04, 2015 7:05 pm
Forum: Mate3 / Mate3s
Topic: Grid USE after manual DROP?
Replies: 5
Views: 3352

Re: Grid USE after manual DROP?

Lance, It runs like a dream on Ubuntu, but it doesn't support Radians because I had to stop supporting grid-tied systems when I was working for the microinverter company. And most Radians are grid-tied. Give me a little more time to get the web-site redone and I'd be happy to send you a copy of the ...
by tallgirl
Sun Jan 04, 2015 8:13 am
Forum: Mate3 / Mate3s
Topic: Grid USE after manual DROP?
Replies: 5
Views: 3352

Re: Grid USE after manual DROP?

Lance, That's likely the best approach. In my experience the various Mate-controlled grid USE / DROP / HBX / e-i-e-i-o schemes don't work with selling power. If I didn't have the absolute worst of luck getting a Mate 3 to last more than a year or two I'd probably have done something with one, softwa...
by tallgirl
Sun Jan 04, 2015 8:06 am
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

Aloha, David, I've run the tests when disconnected from the grid enough times, as well as on off-grid systems, that I know I'm right. I have an abundant supply of charts where the net amp-hours crosses through zero and charge factor compensated amp-hours don't suddenly jump to zero that that alone i...
by tallgirl
Sat Jan 03, 2015 6:49 am
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

Kent -- Unless you've done the things I've repeatedly said need to be done, the charts are irrelevant. I don't know any other way to put it. I'm not denying that the FNDC is a pain in the @ss to configure, because it is. But the biggest problem I've seen throughout this collection of threads is that...
by tallgirl
Thu Jan 01, 2015 3:44 am
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 14
Views: 17026

Re: SOC suddenly jumps to 100%

Greets, As a rule I try not to step on other professionals' toes, so I didn't give this thread a thorough going-over when it was new. That and I had a rather large sale going on at the time ... These settings are almost certainly wrong -- The FNDC is setup with charged parameters of 57 volts, 12 amp...
by tallgirl
Thu Jan 01, 2015 2:20 am
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

Aloha, David -- MPPT sweeps are a common cause of FNDC problems, especially with batteries that are either very close to being fully charged, or batteries that are heavily sulfated. In my experience, the #1 cause of FNDC programming problems is sulfated batteries. The #2 cause is not programming the...
by tallgirl
Mon Dec 29, 2014 6:56 am
Forum: Mate3 / Mate3s
Topic: Mate 3 Issues
Replies: 4
Views: 4314

Re: Mate 3 Issues

Greets, Just a quick followup -- I did wind up replacing the Hub 10 with a Hub 4. The original system plan was to install a second MX-60 (those were the days!) for a west-facing facet. That never happened, so I didn't need more than 4 ports. I re-tried the Mate 3 after replacing the Hub 4 and it sti...
by tallgirl
Wed Dec 17, 2014 8:44 pm
Forum: FLEXnet DC
Topic: SOC suddenly jumps to 100%
Replies: 106
Views: 111239

Re: SOC suddenly jumps to 100%

If the unadjusted (for charge efficiency factor) amphours goes greater than zero sometime in the day after the voltage was over the charged parameter value, the FNDC will reset to 100% SOC. That's not consistent with the specifications for the FNDC, so I consider it a bug. Anyone that takes the tim...
by tallgirl
Wed Dec 17, 2014 8:22 pm
Forum: Mate
Topic: Input Limit settings
Replies: 1
Views: 3729

Re: Input Limit settings

If you haven't figured this out already, adding an autotransformer so that the loads are balanced across the inverter outputs helps as well.
by tallgirl
Sat Dec 13, 2014 5:21 pm
Forum: OpticsRE
Topic: OPTICSRE CONTROL
Replies: 2
Views: 2782

Re: OPTICSRE CONTROL

Can you describe the noise?

There is some humming from the transformers and other magnetic components. There will also be fan noise depending on how much power the inverter is processing. And finally, there are large relays in the inverter which make periodic "click" / "clunk" sorts of noises.