diy solar

diy solar

Has anyone used the Kisae DMT1250 Abso 50A DC-DC Battery Charger with MPPT?

Mex Rider said:
That makes good sense and I decided to stop being impatient while wait for bits and pieces from Amazon and will do the settings when "everything" is in place. I have a solar panel disconnect switch next to the Kisae and a breaker close between the Kisae and the house batteries, so I would just turn off the two switches if things were in an "emergency" state, but I may use my dremel to make the on/off switch more usable...good idea.
Click to expand...
Remember, turn off the PV panels first, and on 2nd..... Every thing I have read/watched says to connect the battery to a SCC before you connect the PV panels. Don't know if it's just an "old wives tale".
 
Sgt Raven said:
Remember, turn off the PV panels first, and on 2nd..... Every thing I have read/watched says to connect the battery to a SCC before you connect the PV panels. Don't know if it's just an "old wives tale".
Click to expand...
Think it is very correct...but maybe I've turned into an old wife...definitely old enough to be in my second childhood, lol!
 
Just got my Kisae 1250 and am getting it all hooked up...anybody know if the alternator connections on channel 1 allow flow from house battery to starter battery and, if so, under what conditions? Just curious if I could ever use a "normal" connection through the Kisae to jump myself or charge the starter battery (ya know, if I ever "hypothetically" worked all night on the van and accidentally ran down the starter battery?)
 
Hi all, just wanted to give an update to this thread, as the online specs and user manual specs did not match regarding panel voltage input. Here is the email I got back from Kisae.

That specification on our website is wrong (sentence transcribing error). Sorry about that.
There is no problem using your 24V nominal series panel array with Voc = 48V.
The maximum operating Voc of the CH2 input port is: 50-51V.
The maximum Voc without damaging the unit is: 56V

About the CH2 Solar Panel Input port in the DMT1230, DMT1250, and DMT2430 units:
You can select whatever good solar panel manufacturer and use whatever solar panel array, as long as you limit them to the following maximum allowable ratings:

· Maximum Solar Panel Input Port (CH2) Voltage (Voc) without damaging the unit: 56Vdc (50V for DMT1230 with serial number below KT1712000000)
· Maximum Solar Panel Input Port (CH2) Current: 30A
· Maximum Operating Solar Panel Input Port (CH2) Voltage (Voc): 50-51Vdc (45-46V for DMT1230 with serial number below KT1712000000)

Note: The unit triggers the E03 error alarm (over-voltage shutdown) and stops working, as soon as the voltage at the solar panel input port “CH2” reaches around 50V-51V. Then, the unit returns automatically to operation after the CH2 voltage drops below around 48V.

That voltage thresholds apply to the DMT1230 models having serial numbers equal to or higher than KT1712000000. For older versions of the DMT1230 model (so having lower serial numbers) the corresponding voltages are 45-46V and 43V respectively.

Maximum Solar Panel Input Port (CH2) Total Power:
o For the DMT1230: Up to 500W (600W allowable) for 12V and 24V nominal panel arrays
o For the DMT1250: Up to 500W (600W allowable) for 12V and up to 750W (800W allowable) for 24V nominal panel arrays.
o For the DMT2430: Up to 500W (600W allowable) for 12V and up to 900W (1080W allowable) for 24V nominal panel arrays.

Solar panel CH2 Input Start-Up (= Cut-in) / Cut-off voltage thresholds (all models): 14.5V /14.0V respectively
 
Does anyone know if this works with 24V house/aux batteries?
(24V panel & 12 starter/chassis battery)
 
mikaelo said:
Does anyone know if this works with 24V house/aux batteries?
(24V panel & 12 starter/chassis battery)
Click to expand...
The dmt12/50 is 12v I put 50a output. The dmt2430 I think it’s called is a 24v output, not sure if it can accept 12v input or not. I run my 1250 from a 24v Input but no idea if it’s possible to go the other way with these
 
Thank you,
I will look in to this unit and contact them to inquire regarding the voltages.
 
I’ve been looking for an alternate solution from the reonogy DCC50S because it seems like for 400W solar I would have to connect them in parallel. Am I correct in my understanding that the Kisae charger would be able to handle a few 100W panels in series?
 
Matteo B said:
I’ve been looking for an alternate solution from the reonogy DCC50S because it seems like for 400W solar I would have to connect them in parallel. Am I correct in my understanding that the Kisae charger would be able to handle a few 100W panels in series?
Click to expand...
Yes, it has a 50V maximum, but can handle 56V without damaging it, by shutting off the input. I am hooking up four 100W panels to mine. They are 21.9V each and I will have two panels in Series, then those 2 pairs in Parallel. The panel wattage it can handle goes up when using higher voltage input. If I had the room to mount them, I could use eight 100W panels, continuing the same pattern.
 
Last edited:
good to hear I’m not totally off base! I am hoping to connect some in series to increase the solar voltage so it will provide sufficient voltage to charge the batteries for more hours of the day (I’m still figuring out if I understand that correctly)
 
Matteo B said:
good to hear I’m not totally off base! I am hoping to connect some in series to increase the solar voltage so it will provide sufficient voltage to charge the batteries for more hours of the day (I’m still figuring out if I understand that correctly)
Click to expand...
If I need more than the four roof mounted panels, I could get another pair of 100W panels and make a ground mounted set to chase the sun with. Just use a Anderson Powerpole at the input and plug the extra panels into the circuit. Use a hinge between the panels and be able to fold them for transport and legs to stand them up on the ground.
 
I have had a couple questions answered by Kisae and here is some info they sent me regarding solar input.

About the CH2 Solar Panel Input port in the DMT1230, DMT1250, and DMT2430 units:

You can select whatever good solar panel manufacturer and use whatever solar panel array, as long as you limit them to the following maximum allowable ratings:

· Maximum Solar Panel Input Port (CH2) Voltage (Voc) without damaging the unit: 56Vdc (50V for DMT1230 with serial number below KT1712000000)

· Maximum Solar Panel Input Port (CH2) Current: 30A (self-limited)

· Maximum Operating Solar Panel Input Port (CH2) Voltage (Voc): 50-51Vdc (45-46V for DMT1230 with serial number below KT1712000000)



Note: The unit triggers the E03 error alarm (over-voltage shutdown) and stops working, as soon as the voltage at the solar panel input port “CH2” reaches around 50V-51V. Then, the unit returns automatically to operation after the CH2 voltage drops below around 48V.

That voltage thresholds apply to the DMT1230 models having serial numbers equal to or higher than KT1712000000. For older versions of the DMT1230 model (so having lower serial numbers) the corresponding voltages are 45-46V and 43V respectively.



Maximum Solar Panel Input Port (CH2) Total Power:

o For the DMT1230: Up to 500W (600W allowable) for 12V and 24V nominal panel arrays

o For the DMT1250: Up to 500W (600W allowable) for 12V and up to 750W (800W allowable) for 24V nominal panel arrays.

o For the DMT2430: Up to 500W (600W allowable) for 12V and up to 900W (1080W allowable) for 24V nominal panel arrays.



Solar panel CH2 Input Start-Up (= Cut-in) / Cut-off voltage thresholds (all models): 14.5V /14.0V respectively
 
chevymike said:
I have had a couple questions answered by Kisae and here is some info they sent me regarding solar input.
Click to expand...
Since you seem to have a contact at Kisae maybe you can get an answer.
I would like a PDF of the setting flowchart for my DMT1250 that could be printed on a oversized 11" x 17" page.
The way it is in the manual makes it a little hard to follow from page to page.
Even a multiple page that could be cut and taped together would work.
 
Sgt Raven said:
Since you seem to have a contact at Kisae maybe you can get an answer.
I would like a PDF of the setting flowchart for my DMT1250 that could be printed on a oversized 11" x 17" page.
The way it is in the manual makes it a little hard to follow from page to page.
Even a multiple page that could be cut and taped together would work.
Click to expand...
I don't have a contact per say, I just emailed the company via their company contact page, https://www.kisaepower.com/contact/ Took them about a week to reply.
 
Hi! Solar noob here.

My related question is, I have the DMT1250 (https://www.kisaepower.com/products/dmt1250/), and (2) of the 175w 12v flexy renogy panels (https://www.renogy.com/175-watt-12-volt-flexible-monocrystalline-solar-panel/).

Going off the Kisae spec sheet, it appears that I can't use the panels and charger together. But if I go off the data from this thread, it appears I can.

Can anyone provide clarity here?

My math:

Each panel can produce 23.9V Open Circuit Voltage (Voc) at 8.98 A

2 panels in parallel: 23.9V at 17.96A

2 panels in series: 47.8V at 8.98A

Kisae spec sheet:
DC INPUT NOMINAL OPERATION:
17.5Vdc for 12V PV panels connected in parallel
35.0Vdc for Dual 12V PV panel connected in series

This thread suggested kisae specs:
50-51Vdc
 
jayswain said:
Hi! Solar noob here.

My related question is, I have the DMT1250 (https://www.kisaepower.com/products/dmt1250/), and (2) of the 175w 12v flexy renogy panels (https://www.renogy.com/175-watt-12-volt-flexible-monocrystalline-solar-panel/).

Going off the Kisae spec sheet, it appears that I can't use the panels and charger together. But if I go off the data from this thread, it appears I can.

Can anyone provide clarity here?

My math:

Each panel can produce 23.9V Open Circuit Voltage (Voc) at 8.98 A

2 panels in parallel: 23.9V at 17.96A

2 panels in series: 47.8V at 8.98A

Kisae spec sheet:
DC INPUT NOMINAL OPERATION:
17.5Vdc for 12V PV panels connected in parallel
35.0Vdc for Dual 12V PV panel connected in series

This thread suggested kisae specs:
50-51Vdc
Click to expand...
Go read post #33 and the voltage amperage limits. The only problem is if the panels produce more than their VOC rating.
Down load the owners manual for the DMT-1250. It lists different figures from the spec sheet.

Specs, as they should be.......

https://www.donrowe.com/KISAE-DMT1250-Abso-50A-DC-DC-Battery-Charger-p/dmt1250.htm

Manual.......

https://www.donrowe.com/v/vspfiles/pdf/dmt1230_dmt1250_dmt2430_owners_guide.pdf
 
jayswain said:
Hi! Solar noob here.

My related question is, I have the DMT1250 (https://www.kisaepower.com/products/dmt1250/), and (2) of the 175w 12v flexy renogy panels (https://www.renogy.com/175-watt-12-volt-flexible-monocrystalline-solar-panel/).

Going off the Kisae spec sheet, it appears that I can't use the panels and charger together. But if I go off the data from this thread, it appears I can.

Can anyone provide clarity here?

My math:

Each panel can produce 23.9V Open Circuit Voltage (Voc) at 8.98 A

2 panels in parallel: 23.9V at 17.96A

2 panels in series: 47.8V at 8.98A

Kisae spec sheet:
DC INPUT NOMINAL OPERATION:
17.5Vdc for 12V PV panels connected in parallel
35.0Vdc for Dual 12V PV panel connected in series

This thread suggested kisae specs:
50-51Vdc
Click to expand...

Based on the info I was given (in post #33), you should be fine in either configuration. Nominal operation is not the same as open circuit voltage. When the panels are connected to a solar controller, their output will be close to what the nominal specs are. If you are concerned, run them in parallel as you are well within specs. My 24v panels have an open circuit about 49v and Kisae said I would be fine when I contacted them specifically about using my panels. Your panels are 12v panels and exactly what that controller was made for. As long as you don't exceed the 600w input for 12v panels, you're good.
 
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