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diy solar

MPP Solar LV2424 kicks butt!!!

Here are a couple transformer choices for you:
110V in, 220V out 5000 VA (isolated, so you would tie hots together)

www.ebay.com

5000W Toroidal transformer 5000VA 380V or 220V input 12V 24V 36V 48V 110V output | eBay

Find many great new & used options and get the best deals for 5000W Toroidal transformer 5000VA 380V or 220V input 12V 24V 36V 48V 110V output at the best online prices at eBay! Free shipping for many products!
www.ebay.com

2x 120V, 1000 VA (tie one wire common as auto-transformer, get 2000 VA at 240V)

www.ebay.com

Toroid ZM843354 Transformer Coil | eBay

Secondary: 2X120V/2X1000VA. Primary: 2X100V/2X20 50/60Hz. Ref: Q CATH II, NT, DOM.
www.ebay.com

2x 120V, 3000 VA (use as auto transformer, get 6000 VA at 240V)

www.ebay.com

Amveco Magnetics MT 3000DS Toroidal Transformer 2x 120 VAC 3000VA Pri/Sec 3KVA | eBay

Model MT 3000DS. Amveco Magnetics. Secondary: 2x 120 Volt, 3000 VA. Primary: 2x 0-100-120 Volt, 50/60 Hz, 3074VA.
www.ebay.com

I've got something similar to the last one, but 9000 VA. Think it weights more than my inverters.
I've added a thermostat to start a fan if it gets hot (40C), and a manual reset one to open if excessively hot (90C), opening a relay.
For now it is part of my circuit breaker tester (triple current, 1/3 the voltage) but later I will set it up to connect my my grid-backup system is running off-grid.
 
Note that while the magnetic core of the transformer can handle the VA rating, if you're just using two 120V primary windings as an auto-transformer their ampacity probably lets each handle only half the watts or VA. In which case it could handle surge to its VA rating just fine but maybe half that continuous.

The one with 3000VA rating, two 120V primary and two 120V secondary windings could be wired as both primary in parallel, both secondary in parallel, and primary/secondary in series with each other (auto-transformer). That would accept 3000VA from one 120V phase and deliver 3000VA to the split phase. So a 6000VA 120V inverter (or generator) could drive a 6000VA 240V load. Should be continuous, so long as airflow keeps it cool enough.
 
@erik.calco any chance you have the ElectroDacus SBMS0 setup with your pack and mpp? I did a quick setup of Will Prose's Hand Truck Generator. And the Dacus seems to be a great BMS but I can't seem to get it to prevent the MPP from charging even when it opens the circuit to the off/on switch of the MPP, (I soldered in parallel EXT03 from the Dacus). Also, not being an Electrician by any means, I wondered if there was a way to get the Dacus to shut off the load, (EXT03 appears to do that), and/or the Charging. I'd like to use EXT04 to shut down charging from the MPP, (Grid). But I'm thinking there would need to be something to wire to the MPP to stop the charging while in standby mode. BTW, great documentation.
 
Greg.Kowieski said:
@erik.calco any chance you have the ElectroDacus SBMS0 setup with your pack and mpp? I did a quick setup of Will Prose's Hand Truck Generator. And the Dacus seems to be a great BMS but I can't seem to get it to prevent the MPP from charging even when it opens the circuit to the off/on switch of the MPP, (I soldered in parallel EXT03 from the Dacus). Also, not being an Electrician by any means, I wondered if there was a way to get the Dacus to shut off the load, (EXT03 appears to do that), and/or the Charging. I'd like to use EXT04 to shut down charging from the MPP, (Grid). But I'm thinking there would need to be something to wire to the MPP to stop the charging while in standby mode. BTW, great documentation.
Click to expand...
I used drop-in Lion Energy batteries which has their BMS inside each. There are limitations that I understand you trying to address. It does feel a bit like we're bleeding edge and the kinks need to be worked out, with the next generation looking back wondering how we survived. :LOL:
 
Do you have the LV2424 MSD or the LV2424 Hybrid?

I think I am finding out that Watchpower only works for the MSD version while the Solarpower software works for the hybrid version. Can you confirm?
 
I purchased an LV2424 MSD and have 2-12v, 100Amp hour LiFePO4 batteries is series. Erik, I noted when you started this post that your unit was trickle charging the batteries at around 1 A and also noted that your readout was showing around 75% charged when, according to the battery voltage, it should have been 100% or close to it. Did you ever resolve this issue? The reason I ask is that mine (which i just connected everything yesterday) show 27.2v which, according to the battery specs (SOK batteries) should be at 100%, but the readout is showing 70%. It is charging the batteries but not trickling. I have it set at 20A charge from solar (did not tie in my mains power yet, nor any loads) and that is what the readout indicated. I checked the batteries wire with a clamp-style Amp meter and, sure enough, it was reading around 20A. I let it run all day and even after several hours the readout still indicated 27.2V on the batteries and 70% charged. The charge to batteries was still 20A. After the sun set and no PV power, the battery dropped to 26.5V (80%) and stayed there overnight. Of course, the ony load was the 3W or so the LV2424 unit uses. My settings are bulk charge 28.4V and float of 27V. I have the float set low since LiFePO4 batteries don't need float (as i understand it). I did note that in your inital post that you had the float set much higher. Could that be my problem? Also, if the batteries state of charge was not balanced initally, could that be causing the issue? The unit works fine otherwise, i just don't like the fact that it seems to be charging the batteries when they appear to be full (confirmed the 27.2V reading with voltmeter by the way). My intention is to leave everything as is for today and see what happens but if it seeems to be feeding 20A to the battteries when the voltage indicates 100% charge, then I have a real cocern with the unit. I don't want it to damage the batteries. They do have BMS's but i shouldn't have to rely on those. The LV2424 should know when the batteries are fully charged and stop charging. Thanks in advance for any feedback.
 
JohnT said:
I purchased an LV2424 MSD and have 2-12v, 100Amp hour LiFePO4 batteries is series. Erik, I noted when you started this post that your unit was trickle charging the batteries at around 1 A and also noted that your readout was showing around 75% charged when, according to the battery voltage, it should have been 100% or close to it. Did you ever resolve this issue? The reason I ask is that mine (which i just connected everything yesterday) show 27.2v which, according to the battery specs (SOK batteries) should be at 100%, but the readout is showing 70%. It is charging the batteries but not trickling. I have it set at 20A charge from solar (did not tie in my mains power yet, nor any loads) and that is what the readout indicated. I checked the batteries wire with a clamp-style Amp meter and, sure enough, it was reading around 20A. I let it run all day and even after several hours the readout still indicated 27.2V on the batteries and 70% charged. The charge to batteries was still 20A. After the sun set and no PV power, the battery dropped to 26.5V (80%) and stayed there overnight. Of course, the ony load was the 3W or so the LV2424 unit uses. My settings are bulk charge 28.4V and float of 27V. I have the float set low since LiFePO4 batteries don't need float (as i understand it). I did note that in your inital post that you had the float set much higher. Could that be my problem? Also, if the batteries state of charge was not balanced initally, could that be causing the issue? The unit works fine otherwise, i just don't like the fact that it seems to be charging the batteries when they appear to be full (confirmed the 27.2V reading with voltmeter by the way). My intention is to leave everything as is for today and see what happens but if it seeems to be feeding 20A to the battteries when the voltage indicates 100% charge, then I have a real cocern with the unit. I don't want it to damage the batteries. They do have BMS's but i shouldn't have to rely on those. The LV2424 should know when the batteries are fully charged and stop charging. Thanks in advance for any feedback.
Click to expand...
From what I've found, Mpp uses a scale of 22v=0%, 29v=100% and its not changeable, and is for all battery types, user defined is what is to be used for Lifepo4.
 
thealaskan said:
From what I've found, Mpp uses a scale of 22v=0%, 29v=100% and its not changeable, and is for all battery types, user defined is what is to be used for Lifepo4.
Click to expand...
Thanks. That's the conclusion i came to as well. I just needed to be a little more patient with the unit. By the second day, it stopped its bulk charge and seems to be keeping the batteries within the specs i set, so all is well. I just basically ignore the percentage. If the middle green light is solid, the charge is complete. i confimred with my volt and amp meters, so I'm good at this point. Thanks for the help.
 
thealaskan said:
Mpp uses a scale of 22v=0%, 29v=100% and its not changeable, and is for all battery types, user defined is what is to be used for Lifepo4.
Click to expand...
just glancing at thread here, while wonder what different versions MPP has for its 24v All In Ones. I have the LV2424 for 120vac or 240vac split phase output options. In "user defined" mode for battery charging myLiFePO4 battery bank, ... Bulk or Absorption Charge voltage; and then Float voltage, and well as cut off voltage CAN Be Set within certain available ranges. ... :+)
 
Changing the float or low voltage cutoff levels also affects the battery% shown.
 
arthurm said:
Perhaps an obvious question: does this include a transfer switch? Speed?
Click to expand...

Its included, not sure about the speed but its in the range of ms, you can usually find it in the user manual / specs page. I can tell you that its fast enough to maintain power in any device, even PC's, so it could be used as an UPS too!
 
I must be blind. Specs don't mention speed.

I'll take your word that it's fast enough for PC's as that's my intended use.
 
I can swear it was in the manual but in a quick check couldn't find it, hopefully someone here has the data.

But i have tested them in a bunch of computers and none of them have turned off, although if its something critical i could advise about getting an smaller complementary UPS since they usually have shorter switch time, or can run all the time on the inverter / batteries (No transfer time) depending on the type of unit.
 
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