Search found 20 matches

by jponathanstarr
Tue Jun 04, 2019 6:52 pm
Forum: Off Grid Applications
Topic: MPPT (FX80) & PWM controllers on one bank
Replies: 2
Views: 2313

Re: MPPT (FX80) & PWM controllers on one bank

Hi Mike, That's kind of the direction I am thinking. I assume the old Xantrex PWM charging algorithms are a bunch less sophisticated and battery friendly compared to the Flexmax, so if I lower the settings on the Xantrex it will still help make some useful juice when it's extended cloudy, and then w...
by jponathanstarr
Tue Jun 04, 2019 1:54 pm
Forum: Off Grid Applications
Topic: MPPT (FX80) & PWM controllers on one bank
Replies: 2
Views: 2313

MPPT (FX80) & PWM controllers on one bank

Upper Hut system.jpg I have two locations systems at separate locations on my property. The smaller, caretaker residence has 12 Hyundai 290w panels (4 strings) divided on two FM80's, and 20 old Shell 75w panels on a Xantrex C40 controller. Both feed into a GB 24v 1580ah forklift battery. The old pa...
by jponathanstarr
Thu May 30, 2019 11:07 am
Forum: Off Grid Applications
Topic: Thoughts on Refurbished Forklift Batts
Replies: 15
Views: 11245

Re: Thoughts on Refurbished Forklift Batts

That is a perfect application for a refurb bank. Hope they hang in there into their twenties!
by jponathanstarr
Tue May 28, 2019 5:27 pm
Forum: FLEXmax Charge Controllers
Topic: Mix/Match solar panels
Replies: 18
Views: 8654

Re: Mix/Match solar panels

Thanks Kurt.
by jponathanstarr
Tue May 28, 2019 12:02 pm
Forum: FLEXmax Charge Controllers
Topic: Mix/Match solar panels
Replies: 18
Views: 8654

Re: Mix/Match solar panels

A related question:
If I have a FM80 controller with several strings of 290w panels, and I may want to add a string of similar but slightly higher rated 300w panels by the same manufacturer and series, what negative impacts might occur?
by jponathanstarr
Mon May 27, 2019 2:49 pm
Forum: Off Grid Applications
Topic: Thoughts on Refurbished Forklift Batts
Replies: 15
Views: 11245

Re: Thoughts on Refurbished Forklift Batts

I absorb for one hour. Generally my bank only goes down 10% - 15% and is back to 100% SOC by 11am. If it's a several day extended rainy period without sun, I may go down to 75% and I guess I could use a longer absorb time, but I know we'll get to a sunny stretch soon enough to be back to normal. I'v...
by jponathanstarr
Sun May 26, 2019 9:32 pm
Forum: OutBack
Topic: Outback MTBF
Replies: 7
Views: 5617

Re: Outback MTBF

Priorities, I guess. We haven't run fossil fuel generators here for a decade.

On reflection, 2 more inverters that I could cut in before activating the heavy starting loads would be really nice. Maybe one day ....

Or an upgrade to a Radian 8048 ...
by jponathanstarr
Sun May 26, 2019 8:22 pm
Forum: Off Grid Applications
Topic: Thoughts on Refurbished Forklift Batts
Replies: 15
Views: 11245

Re: Thoughts on Refurbished Forklift Batts

Best, Jim BTW, I was directly responsible for servicing, maintaining and charging the forklift battery at a previous place. But when the battery couldn't make it through the day and we replaced it, I bought it for the core charge. Try as I might, I couldn't restore any service into the unit. I was ...
by jponathanstarr
Sun May 26, 2019 8:10 pm
Forum: Off Grid Applications
Topic: Thoughts on Refurbished Forklift Batts
Replies: 15
Views: 11245

Re: Thoughts on Refurbished Forklift Batts

Hi Jim, I've always had problems with corrosion of the steel forklift battery casings, particularly in the corners from inside, and the need to replace buss bars connecting cells due to them getting eaten by blue copper sulphate from acid mist. Taping them with 3-m vinyl tape or using heat shrink tu...
by jponathanstarr
Sun May 26, 2019 12:57 pm
Forum: Off Grid Applications
Topic: How true a sine wave?
Replies: 3
Views: 3349

Re: How true a sine wave?

I can't see any definitive steps. To me, that = good.
by jponathanstarr
Sun May 26, 2019 12:49 pm
Forum: OutBack
Topic: Outback MTBF
Replies: 7
Views: 5617

Re: Outback MTBF

MOS is definitely an issue. I put my initial system together in 1994, when I built my house and developed infrastructure in this remote part of Haleakala volcano. Over the years inverters and charge controllers and batteries have changed, and many wiring shortcuts have remained. I've been replacing ...
by jponathanstarr
Sun May 26, 2019 12:32 pm
Forum: FLEXmax Charge Controllers
Topic: Longevity of FM 80's run at full capacity
Replies: 0
Views: 2657

Longevity of FM 80's run at full capacity

I just completed an install of 15 Hyundai HiS-S290RG mono panels, 5 strings of 3 into a combiner box and a new FM80. They replaced a load of old 75-watt panels that gave me 25 years of service. When the batteries are down a bit and full sun is is bulk charging in midday, I'm hitting 80 amps out from...
by jponathanstarr
Sun May 26, 2019 12:20 pm
Forum: Off Grid Applications
Topic: Thoughts on Refurbished Forklift Batts
Replies: 15
Views: 11245

Re: Thoughts on Refurbished Forklift Batts

I stay away from refurbished batteries. I am buying batteries for expectation of long life, and the last 2 banks we've had have each given great service for more than 15 years. We take good care of them, never going below 50% SOC. When you divide the cost of new batteries by years or months of servi...
by jponathanstarr
Sun May 12, 2019 4:39 pm
Forum: OutBack
Topic: Outback MTBF
Replies: 7
Views: 5617

Outback MTBF

Been performing some offgrid power system upgrades and I was reminiscing about our component evolution over the past 4 decades. We've had 3 Outback inverters running for 12 years, and 3 Flexmax charge controllers. That's 72 years of service history. We recently had a first minor failure, an inoperat...
by jponathanstarr
Mon May 06, 2019 9:19 pm
Forum: Off Grid Applications
Topic: Long run for solar array
Replies: 4
Views: 2558

Re: Long run for solar array

Yes, voltage is your friend!
by jponathanstarr
Sun May 05, 2019 5:58 pm
Forum: Off Grid Applications
Topic: Adding solar panels and a 2nd charge controller
Replies: 9
Views: 5301

Re: Adding solar panels and a 2nd charge controller

I'm liking the Snap N Rack racking system as we replace worn out 26 year old panels & stuff. It's my first time using properly designed gear for this, Amphenol H4 connectors instead of field soldering, combiner boxes etc. Sure beats having to figure it all out ourselves.
by jponathanstarr
Sun May 05, 2019 5:43 pm
Forum: Off Grid Applications
Topic: Is it wise to buy spare Outback 'parts' - just in case?
Replies: 19
Views: 6931

Re: Is it wise to buy spare Outback 'parts' - just in case?

We've always run 2 inverters on our system, primarily so we had a second one ready to go if the primary glitched. That occurred a couple of times in the years we were running Trace gear up till around 2006. We've never had an issue in years with the FXR3048's, and over time have added some 220v load...
by jponathanstarr
Sun May 05, 2019 4:55 pm
Forum: Off Grid Applications
Topic: Long run for solar array
Replies: 4
Views: 2558

Re: Long run for solar array

We used to run a homebrew hydro machine (pelton wheel) that was around 1500 feet uphill in the early 1980's. It was putting out wild AC, around 130v and 8 amps, through a twisted pair of #8s hung on the fence line. At the bottom it was connected to a multi-tap transformer, and we could regulate it c...
by jponathanstarr
Fri May 03, 2019 1:12 pm
Forum: FLEXmax Charge Controllers
Topic: String Sizing Tool for MX and FM Charge Controllers
Replies: 85
Views: 1559752

Re: String Sizing Tool for MX and FM Charge Controllers

Thanks. The link to the Excel file works for me. Other pointers from the website etc have seemed problematic.
by jponathanstarr
Thu May 02, 2019 1:10 pm
Forum: FLEXmax Charge Controllers
Topic: String Sizing Tool for MX and FM Charge Controllers
Replies: 85
Views: 1559752

Re: String Sizing Tool for MX and FM Charge Controllers

Is there an updated link for the string sizing tool?