Search found 1514 matches

by Kent Osterberg
Fri Mar 29, 2019 3:40 pm
Forum: Off Grid Applications
Topic: High Specific Gravity, and what to do about it
Replies: 7
Views: 2114

Re: High Specific Gravity, and what to do about it

Jeff, I agree with the battery tech, the high specific gravity is almost certainly caused by overcharging. That's a lot better situation than undercharging. And the specific gravity you are observing is only slightly high. Don't lower the absorption setting by very much, maybe 0.1 or 0.2 volt. You d...
by Kent Osterberg
Sun Feb 10, 2019 2:47 pm
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 2704

Re: Radians tripping GFDI ??? Help me understand

Changing the Mate3 settings shouldn't make any difference.
by Kent Osterberg
Sun Feb 10, 2019 12:41 pm
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 2704

Re: Radians tripping GFDI ??? Help me understand

I am, however, really curious as to how a setting in the system can cause a breaker to trip.
That doesn't seem right. Did you reconnect the ground in the DC enclosure?
by Kent Osterberg
Sat Feb 09, 2019 7:49 pm
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 2704

Re: Radians tripping GFDI ??? Help me understand

It's not surprising that both GFDI's trip, the two sense circuits are parallel to each other- they both connect the DC- bus bar to ground in the GSLC. The sense circuit for the ac coupled PV array is isolated from the Outback GFDI in that the DC- of the ac coupled array is not connected to the GSLC,...
by Kent Osterberg
Sat Feb 09, 2019 10:54 am
Forum: OutBack
Topic: Radians tripping GFDI ??? Help me understand
Replies: 11
Views: 2704

Re: Radians tripping GFDI ??? Help me understand

Brett, The GFDI breakers are supposed to be the only connection between dc- and ground. Any current flowing from dc- to ground can trip the GFDI breakers; it doesn't have to be associated with a fault in the PV array at all. It doesn't even have to be a dc current. The problem you are having seems l...
by Kent Osterberg
Mon Jan 28, 2019 7:46 pm
Forum: Grid Tie Applications
Topic: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?
Replies: 6
Views: 3630

Re: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?

It is possible to wire up one of the old disk-type form 2S meters to read correctly when metering a 120-volt circuit . The form 2S is the kWh meter that is the most common. The meter will run forward when you are producing power and it will run backward when you are using power, so it will indicate ...
by Kent Osterberg
Mon Jan 28, 2019 1:17 pm
Forum: Grid Tie Applications
Topic: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?
Replies: 6
Views: 3630

Re: FP1-VFXR3524 1 Hot Leg Output Sub Panel Elec Code?

Yoe, You should be able to wire everything pretty much as shown in the diagram and the electrical inspector should be happy with it. One thing not on the drawing that may be required by your utility company for net metering is a disconnect switch between the main ac panel and the inverter input term...
by Kent Osterberg
Fri Jan 11, 2019 5:21 pm
Forum: Grid Tie Applications
Topic: daily absorption time for backup batteries?
Replies: 9
Views: 4217

Re: daily absorption time for backup batteries?

It is very likely that the reason you are seeing the spread in the specific gravity values is that the battery electrolyte is stratified. A short absorption time on batteries that aren't discharged much will leave the batteries with lots of time just sitting. They need to bubble long enough to keep ...
by Kent Osterberg
Sun Jun 17, 2018 5:49 pm
Forum: Off Grid Applications
Topic: FNDC voltage
Replies: 2
Views: 934

Re: FNDC voltage

If you are up to it, here is a post that shows where to make the adjustment:
http://www.outbackpower.com/forum/viewtopic.php?f=28&t=4372&start=38
by Kent Osterberg
Sun May 06, 2018 9:21 am
Forum: Off Grid Applications
Topic: Absorb question for lead acid batteries
Replies: 7
Views: 1980

Re: Absorb question for lead acid batteries

The item missing on Trojan's web site link that is included in their battery manuals is that charging should continue until the charging current drops to 1% to 3% of the battery capacity. Holding the absorb voltage for two hours is probably not long enough, that is especially true after the batterie...
by Kent Osterberg
Mon Apr 09, 2018 7:17 pm
Forum: RADIAN Series
Topic: Please does anyone know how to unclip this connector
Replies: 2
Views: 1335

Re: Please does anyone know how to unclip this connector

You insert a screw driver in the large rectangular slot and lift the handle outward. It is more difficult than you might expect. You can see it done on this YouTube video. https://www.youtube.com/watch?v=tMTTFck1-Zs
by Kent Osterberg
Tue Jan 30, 2018 5:26 pm
Forum: Off Grid Applications
Topic: Generator doesnt stop charging.
Replies: 6
Views: 1662

Re: Generator doesnt stop charging.

You can tell what device the Mate's AGS system is using to control the generator in the AGS setup (ADV/MATE/AGS/SETUP). 0 or 1 will be the aux port on the master inverter. It is possible to setup the FNDC to operate its relay independently of the MATE AGS. Confirm this hasn't been done by checking A...
by Kent Osterberg
Fri Jan 26, 2018 10:09 am
Forum: Off Grid Applications
Topic: Generator doesnt stop charging.
Replies: 6
Views: 1662

Re: Generator doesnt stop charging.

I recommend that the transfer delay be set between 3 and 6 cycles. A long delay, as you have experienced, will cause the lights and other devices to blink off for a moment. If the delay is too short, the inverter may disconnect from the generator unnecessarily and cause other problems. I suspect tha...
by Kent Osterberg
Tue Jan 23, 2018 11:59 am
Forum: Off Grid Applications
Topic: Generator doesnt stop charging.
Replies: 6
Views: 1662

Re: Generator doesnt stop charging.

It looks like you are using the oval Mate, is that right? You need to look at the AGS state. %SOC stop only works if the AGS start was because of %SOC start, 24 voltage start, or 2 hour voltage start. If the start reason was 2 min voltage start, then the system will charge until the FNDC's charge pa...
by Kent Osterberg
Fri Dec 01, 2017 4:01 pm
Forum: RADIAN Series
Topic: need dual battery cables if I only have 1 string?
Replies: 5
Views: 2619

Re: need dual battery cables if I only have 1 string?

Outback recommends the doubled 2/0 cable because it has lower resistance and inductance than single 4/0 cable. Four 2/0 cables will physically fit in 2" conduit within the allowed 40% fill, but passing the cable lugs through the 2" conduit will be a challenge. Unfortunately, four cables in conduit o...
by Kent Osterberg
Thu Nov 30, 2017 1:08 pm
Forum: OutBack
Topic: battery bank disconnect
Replies: 8
Views: 5191

Re: battery bank disconnect

The 2/0 battery interconnect cables are essentially in free air and have an ampacity of 225 amps for 60┬░C rated wire and 265 amps for 75┬░ rated wire, so it is perfectly safe to use single 2/0 cable for the interconnects. You just lose more energy than if you doubled them up. If the interconnects a...
by Kent Osterberg
Mon Nov 27, 2017 8:34 pm
Forum: OutBack
Topic: battery bank disconnect
Replies: 8
Views: 5191

Re: battery bank disconnect

Ravenswood, you came up with a nice looking solution for paralleling battery strings. Thanks for sharing the idea. It makes for an easy and safer place to disconnect the batteries when needed, but you still have to be really careful to not short the batteries with a misplaced tool.
by Kent Osterberg
Sun Nov 26, 2017 10:51 am
Forum: OutBack
Topic: battery bank disconnect
Replies: 8
Views: 5191

Re: battery bank disconnect

The dc breaker(s) in a flexware panel are suitable for both purposes of disconnect and overcurrent protection for most battery systems. But they do not provide fault protection inside the flexware panel - even with the breakers in the off position, a misplaced tool can short the battery with disastr...
by Kent Osterberg
Thu Nov 02, 2017 9:11 am
Forum: RADIAN Series
Topic: Radian in outbuilding--need separate ground rod?
Replies: 4
Views: 2547

Re: Radian in outbuilding--need separate ground rod?

You probably need two 8' x 5/8" ground rods that are six feet apart. The ground terminal in the Radian load center should be connected to the grounding electrodes at the out building. There should be four wires going to the electrical panel at the house: L1, L2, N, and Gnd. The neutral wire should b...
by Kent Osterberg
Thu Nov 02, 2017 7:16 am
Forum: RADIAN Series
Topic: Radian in outbuilding--need separate ground rod?
Replies: 4
Views: 2547

Re: Radian in outbuilding--need separate ground rod?

It depends on the local codes where you are at, but in most locations a second grounding system at the outbuilding is required by NEC250.32(A).
by Kent Osterberg
Thu Apr 27, 2017 9:11 am
Forum: Off Grid Applications
Topic: Flooded Battery theory
Replies: 2
Views: 1248

Re: Flooded Battery theory

1) "The lower the electrolyte level the shorter the overall lifetime of the battery." The point at the time was ALWAYS keep it full or else the life of the battery is shortened. If the plates are exposed because the electrolyte level is allowed to drop too low, that will certainly shorten the batte...
by Kent Osterberg
Tue Jul 12, 2016 8:09 am
Forum: Off Grid Applications
Topic: How to know when your batteries are fully charged
Replies: 7
Views: 3662

Re: How to know when your batteries are fully charged

While talking about more aggressive charging to assure that batteries are getting fully charged take a look at US Battery's charging recommendation . Basically they are saying to hold the absorption voltage constant for 2 or 3 hours after the return amps drops to 3%. That will be a total absorption ...
by Kent Osterberg
Fri Jul 08, 2016 3:23 pm
Forum: Off Grid Applications
Topic: How to know when your batteries are fully charged
Replies: 7
Views: 3662

Re: How to know when your batteries are fully charged

Lead-acid batteries charge slowly as they approach full charge. Increase the absorption time! If your batteries are bubbling significantly during the absorption charge, raising the voltage won't accomplish mush except to increase water consumption.
by Kent Osterberg
Wed May 25, 2016 7:58 pm
Forum: FLEXmax Charge Controllers
Topic: Absorb end amps
Replies: 6
Views: 5189

Re: Absorb end amps

In most systems, in fact almost all systems, the absorb end amps should be set to zero; effectively defeating it. If there are loads in the system that can change during the day, the charge controller output will have to increase or decrease to accommodate them. This makes it impossible to choose an...
by Kent Osterberg
Thu Mar 24, 2016 8:13 am
Forum: FLEXmax Charge Controllers
Topic: Low Temp Battery Protection
Replies: 9
Views: 10353

Re: Low Temp Battery Protection

It is easy to use an external switch to turn off the FX inverter using its remote on/off terminals. I'd recommend using a switch made by Eco Energy . If the one they make doesn't do what you want, they will make a custom one for you at a reasonable price. If the switch is to be located in the cold, ...