What gauge wire?
I'm going to be adding a second solar panel and need to know what gauge wire I need for 2/140w panels on a 35' run. Thanks Keith
Forum Discussion
Harry Parsonage
Subject: Install of Qianqsun® LCD 30A MPPT Solar Panel Regulator Charge Controller 12V/24V
380W/760W With USB
Letter Mailed to:
Peng Jian Chu-YP
8th Flr Bldg 6F
Ju Yin Technology Industrial Park
Gan Li Road No. 1
Bu Ji Long Gang District
SHENZHEN GUANGDONG
CHINA 518112
I recently purchased your Solar Charge Controller via Amazon.com and installed it into my RV. I
have 3 – 95 Watt Solar panels on the roof and 4 pairs of 6 Volt – 225 Amp Hour batteries on the
coach. I used your controller to replace the Go-Power SC30 Charge Controller; which was working
just fine, but it does not have MPPT protocol for maximizing the charge of the batteries.
Even though I had a small place to mount your Charge Controller, I was able to do so in the same
footprint as the SC-30 controller.
I am not using the “Auxiliary Power Output – i.e. Load Control” feature of your controller, so there is minimal heat dissipated by the unit. I did however, mount the unit onto the control panel with ¼”
stand-offs to keep the base plate properly ventilated. Note: The space behind the face of the control center is about 3-1/2 inches deep, so there is adequate air space behind the MPPT controller.
Shown above is the remote display panel of the Bogart Engineering PentaMetric Battery Monitoring system. This device monitors the power flow of my battery bank, Amps Input from solar, Amps Input from on board Converter / Charger, and Amps draw by the 3000 Watt Inverter. The unit also collects historical data, so I can analyze the consumption of power on the RV over many months of use.
The system also collects data about battery state, voltage and amperage, during the different charging phases that your MPPT controller will apply to maintain the batteries.
The photo below shows the Input from the solar panel ( i.e. 8.92 Amps on Bogart and 8.9 on Qianqsun Unit) and current battery bank voltage level ( 13.6 as shown on both displays).
As you can see in the first photo above, I plugged in the short Temperature Thermister into the top of the unit. If I want to have actual battery temperature, what Thermister (i.e. 100 K ?? ) can I mount on the negative terminal of the coach battery which is about 20 Ft away from this MPPT controller?
Yesterday I ran multiple 110 Vac appliances ( Microwave / Convection Oven, Electric Hot Water Pot, TV and Satellite Receiver ) and as many of the 12 volt devices (i.e. Refrigerator on 12 Volt ) I could turn on in the coach. The peak load on the battery bank was 82 Amps, but the average was 16.8 Amps over the 8 hour day of use. Note: The instantaneous voltage, during the peak 82 Amps of draw, was a low of 12.3; returning to 13.6 on average. At the end of the day my battery was down about 10%. Today I checked and the battery has fully recovered to 100% just from solar input late in the evening and from early morning sunlight. So it appears your unit is working, and I will continue to monitor its performance over the next few months.
Regards
Harry N. Parsonage
Gamma Infinity, LLC
1547 Palos Verdes Mall #404
Walnut Creek, CA 94597
(925) 945?0672
Subject: Install of Qianqsun® LCD 30A MPPT Solar Panel Regulator Charge Controller 12V/24V
380W/760W With USB
Letter Mailed to:
Peng Jian Chu-YP
8th Flr Bldg 6F
Ju Yin Technology Industrial Park
Gan Li Road No. 1
Bu Ji Long Gang District
SHENZHEN GUANGDONG
CHINA 518112
I recently purchased your Solar Charge Controller via Amazon.com and installed it into my RV. I
have 3 – 95 Watt Solar panels on the roof and 4 pairs of 6 Volt – 225 Amp Hour batteries on the
coach. I used your controller to replace the Go-Power SC30 Charge Controller; which was working
just fine, but it does not have MPPT protocol for maximizing the charge of the batteries.
Even though I had a small place to mount your Charge Controller, I was able to do so in the same
footprint as the SC-30 controller.
I am not using the “Auxiliary Power Output – i.e. Load Control” feature of your controller, so there is minimal heat dissipated by the unit. I did however, mount the unit onto the control panel with ¼”
stand-offs to keep the base plate properly ventilated. Note: The space behind the face of the control center is about 3-1/2 inches deep, so there is adequate air space behind the MPPT controller.
Shown above is the remote display panel of the Bogart Engineering PentaMetric Battery Monitoring system. This device monitors the power flow of my battery bank, Amps Input from solar, Amps Input from on board Converter / Charger, and Amps draw by the 3000 Watt Inverter. The unit also collects historical data, so I can analyze the consumption of power on the RV over many months of use.
The system also collects data about battery state, voltage and amperage, during the different charging phases that your MPPT controller will apply to maintain the batteries.
The photo below shows the Input from the solar panel ( i.e. 8.92 Amps on Bogart and 8.9 on Qianqsun Unit) and current battery bank voltage level ( 13.6 as shown on both displays).
As you can see in the first photo above, I plugged in the short Temperature Thermister into the top of the unit. If I want to have actual battery temperature, what Thermister (i.e. 100 K ?? ) can I mount on the negative terminal of the coach battery which is about 20 Ft away from this MPPT controller?
Yesterday I ran multiple 110 Vac appliances ( Microwave / Convection Oven, Electric Hot Water Pot, TV and Satellite Receiver ) and as many of the 12 volt devices (i.e. Refrigerator on 12 Volt ) I could turn on in the coach. The peak load on the battery bank was 82 Amps, but the average was 16.8 Amps over the 8 hour day of use. Note: The instantaneous voltage, during the peak 82 Amps of draw, was a low of 12.3; returning to 13.6 on average. At the end of the day my battery was down about 10%. Today I checked and the battery has fully recovered to 100% just from solar input late in the evening and from early morning sunlight. So it appears your unit is working, and I will continue to monitor its performance over the next few months.
Regards
Harry N. Parsonage
Gamma Infinity, LLC
1547 Palos Verdes Mall #404
Walnut Creek, CA 94597
(925) 945?0672
